Toyota Yaris - Help me understand a near accident - Teapot42

I had a bit of a fright driving home last night. Coming around a big roundabout all of a sudden I was going sideways... Car did just over a 180 with the back end just going with seemingly no warning. Not sure how to describe the speed without it sounding bad - it wasn't anything like excessive but it wasn't pottering either. But as I've driven the same car for 10 years, I know what it can do and was well within the limits. Indeed, I've never experienced any rear looseness, if the car wants to go the front washes out first and you get plenty of warning to sort things out before it gets dangerous.

Luckily in this case I didn't (seem) to hit anything. I moved the car somewhere safe and checked it over, found the read near side tyre was a few pounds down on pressure but nothing serious. I guess it could even be that going sideways may have temporarily separated the tyre and rim letting some pressure out. Certainly it hasn't lost any more in the day since I pumped it back up.

The car also has 195s on the rear as opposed to the standard 175s so you'd have thought the rear getting loose would be even less likely as there is more rubber on the road.

So... Any suggestions?

The initial thought was maybe diesel on the road. It was damp but not raining at the time. There are plenty of lorries and buses use this roundabout.

However, I've since learned something interesting today. I mentioned this to someone at work and he commented that the same morning he'd got to the roundabout to find a car on it's roof. Sounds like whatever caused my spin may well have accounted for someone else.

Also, driving home tonight (kid gloves!) I noticed the council have recently repainted the markings on the roundabout and there is now a big block of text just about where I started losing control. Now, you always hear the F1 commentators going on about putting a wheel on the paint in the wet, but how much of a problem is it in real life driving? Could it be that going over this damp paint has reduced grip to the point where it was dangerous, or is it just a red herring?

I'm sure you can guess my thinking here - if there was something on the road that has already caused one accident then why wasn't it cleared up, or if new road markings are causing a danger the council needs to know to remove them....

Otherwise, is there anything else I need to check that might have broken on the car? It feels fine but of course I've been very gentle with it since! Tyres seem to have plenty of tread still, I've checked the pressures and nothing major wrong.

Toyota Yaris - Help me understand a near accident - dereckr

“maybe diesel on the road. It was damp but not raining at the time…”

A combination of these factors would seem the most likely. In my experience, damp roads can be more slippery than wet roads.

Edited by dereckr on 04/10/2012 at 00:21

Toyota Yaris - Help me understand a near accident - Auristocrat

"However, I've since learned something interesting today. I mentioned this to someone at work and he commented that the same morning he'd got to the roundabout to find a car on it's roof."

Could the car that was on it's roof have been diesel, and the cause of some diesel spillage on the road.

Toyota Yaris - Help me understand a near accident - bear807
I have similar experience on my last jazz few months ago outside queens retail park roundabout in stafford. I remember is a wet night, I corner through the roundabout Going too near the island, suddenly I feel my rear end go sideways, luckly I quickly steer the opposite and gas it to steer out. If I'm not wrong the back end was fitted with budget tires. So the conclusion was either I corner to hard or the rear end go aqua plain....
Toyota Yaris - Help me understand a near accident - bazza

Diesel on the road, plus damp = lethal. Anyone who rides a bike knows this only too well. Plus the paint banding, yes, get a wheel on that in the wet and same thing- no grip. Do the bikers a favour and report your incident to the Highways Authority and/or local council, they have a duty of care etc, before someone gets killed.

Toyota Yaris - Help me understand a near accident - madf

Check tracking: ATS do check free.

Son's Yaris did same: tarcking way out. Spun in wet twice before checked and adjusted.

Toyota Yaris - Help me understand a near accident - gordonbennet

195's on the rear?....do you have 195's all round?....regardless, are the wheels standard?...could be tyres too wide for the wheels.

Anyway, thats only an aside as you obviously manage well enough normally.

Whats sort of traffic does the road carry, if it takes a lot of 3 axle trailer lorries then the surface will be badly worn and surfaced in rubber from tyre scrub, the last roundabout as you enter start of A14 at M6/M1 junction is like this, worn out, often find vehicles spun out several yards down the A14, in my truck i can still have wheelspin when empty at 40mph plus accelerating up to speed after that section.

Contractors often put down anti skid surfaces approaching junctions but seldom continue the surface to a point where most are re-applying power whilst straightening up...which is where these events often happen.

The above posts re spillages and general road filth are valid, it all adds up, and its such circumstances that show a tyre's worth, they're all the same in the dry even bald, its when slippery that you find the tenner you saved on each one might not have been such a good saving after all.

Remember the worse time of all is coming up and the scenario thats catches many out in the early winter evenings...road salted previously possibly over several days, and the damp descends early evening but nowhere near freezing...turns that salt into the most slippery mush.

Toyota Yaris - Help me understand a near accident - skidpan

How old are the tyres, rubber hardens with age and looses grip.

Putting larger tyres on one end of the car is not a good idea unless the manufacturer designed it like that. BMW/Merc often fit bigger tyres on the rear but thay are RWD and have more power than a Yoric. I have never seen a FWD car with bigger tyres on the rear as part of the original design.

One thing to note about wider tyres is they can have less grip in poor conditions than narrow tyres, this may have been the cause of your near accident.

If you change tyre size you need to inform your insurance company, its a modification that will render your comprehensive insurance void, any damage you do to others will still be covered of course.

My money is still on diesel, has happened to me in the past.

Toyota Yaris - Help me understand a near accident - Falkirk Bairn

My son spun our Granada 20 yrs ago into a concrete bollard whilst exiting a roundabout........witness was a neighbour who said he doing 10-15 mph............Diesel made the car spin.............£1,000 insurance excess for a young driver was difficult to swallow

Toyota Yaris - Help me understand a near accident - Teapot42

I'm not sure on the age of the tyres, I had them fitted maybe 2 years ago as part-worns. I was misadvised to get 195s all round to help the grip, I changed the front two back to 175s earlier this year but haven't got around to changing the back two yet. (My normal source of part worns only had one pair of 175s at the time) I've put off changing the other two as I was planning to change the car soon, although a possible change of circumstances has meant that has been put on hold so I may wander down to the tyre place tomorrow afternoon and see what they have in stock. It will only be £50-60 for a pair so worth it really.

Toyota Yaris - Help me understand a near accident - skidpan

I'm not sure on the age of the tyres, I had them fitted maybe 2 years ago as part-worns.

So you fitted the wrong size tyre 2 years ago and just to add to your problems they had been used and abbused by someone else before you. Get them replaced ASAP, I still say diesel was probabaly to blame but to carry on with those tyres is a death wish.

Toyota Yaris - Help me understand a near accident - Teapot42

I really can't understand the phobia against part-worn tyres. I've been using them as long as I've been driving with only the odd exception. I've never had a problem and have always had a better ride and felt more secure on good quality part-worn tyres than new budget tyres. My understanding is that they have to be up to standard so anything dangerous can't be supplied anyway so what is the problem?

Toyota Yaris - Help me understand a near accident - unthrottled

Ditto. I'm fairly pleased with mine. Pair of mid range tyres for forty quid.Loads of tread left and I can replace them early and still be cost effective. I'd rather have my part worns than a pair of Ling Longs that'll last about 100,000 miles assuming I dn't wrap the car round a tree first.

I'm not going to panic about damaged carcasses. I've yet to see someone pre-emptively replace "new" tyres that hit a pothole or kerb too hard on the off chance that the carcass may be compromised.

Toyota Yaris - Help me understand a near accident - Engineer Andy

The previous advice about be weary of part-worn or older tyres is sound - I recently changed my Bridgestone ER30s on my Mazda3 even though they were still only part worn (4mm tread on the fronts/ 6mm on the rears after 42k miles [I have a light foot]), beacuse they were 6.5 years old and starting to step out on damp roundabout etc like yours (though not as bad).

It was noticeable how poorer the ride comfort level was compared to when I originally bought the car (factory-fitted tyres), which was all the more apparent when the new tyres were fitted. Hard (and probably brittle) tyres = little grip in the wet. My experience is that if the tyres start getting noisy, then they are probably getting hard/brittle as well, and its then time to think about changing them.

The problem with part-worn tyres is that they could've been used on a car that's done little mileage over a long time, so always check the year of manufacture (which should be part of a code on the sidewall) first before buying (amongst other parts of the inspection).

Edited by Engineer Andy on 06/10/2012 at 11:44

Toyota Yaris - Help me understand a near accident - Teapot42

I think a lot depends on what the alternative is. If you are prepared to pay for decent new tyres then I agree that part-worns are not a good choice. If you would just put budget tyres on then a decent set of part worns is a better bet.

I agree with your caveat, the place I go show you the tyres before putting them on so you can decide for yourself. The last pair I got were Mitchelins so a decent make as well and still less than a new budget tyre.

It was interesting today. I went to get the back two changed for 175 part worns. There were already two cars there getting part worns fitted, a flash Disco and a 61 reg Bentley!

Toyota Yaris - Help me understand a near accident - TeeCee

I changed the front two back to 175s earlier this year but haven't got around to changing the back two yet.

So the rears are more worn than the fronts and thus, when on the limit of grip, the rear end breaks first. No other factors required to explain that behaviour.

The problem with this on FWD cars is that the instinctive action when it "goes" (lifting off) only serves to make matters worse, as the gripping fronts provide deceleration, while the backs continue on their merry way. At that point the whole arrangement swaps ends very sharply. The correct (although counterintuitive) action to take in a FWD car when the rear goes is to accelerate, allowing the fronts to drag everything back into line.

As getting this right is beyond most and requires considerable practise to get it ingrained, the general recommendation is to put the better tyres on the rear to stop it happening in the first place.

Toyota Yaris - Help me understand a near accident - Teapot42

So the rears are more worn than the fronts and thus, when on the limit of grip, the rear end breaks first. No other factors required to explain that behaviour.

Not necessarily - on a FWD car, the rears wear much less than the fronts, so despite them being older there is no reason why they would be any more worn.

I'd also had an experience a few weeks ago where I misjudged how tight a corner was on a road I'd not driven before. The behaviour was that the front washed out and the back end stayed in line. That would suggest that something else affected what happened.

I do agree about the correct behaviour and if I'd had warning it was going to happen I could have tried this, but before I knew what was going on I was already sideways with no chance of saving it, it was that sudden. Even then, it would depend what you are used to. On cars where the back does go easily you would be more likely to do this, where the back has never gone in the past you'd not realise what was happening until it was too late.

Toyota Yaris - Help me understand a near accident - TeeCee

So the rears are more worn than the fronts and thus, when on the limit of grip, the rear end breaks first. No other factors required to explain that behaviour.

Not necessarily - on a FWD car, the rears wear much less than the fronts, so despite them being older there is no reason why they would be any more worn.

Given four new boots and a period of time I would indeed expect the fronts to be more worn. However, you have already said that you replaced the fronts recently. Presumably part-worns are much of a muchness and thus the newer fronts have more tread?

Toyota Yaris - Help me understand a near accident - Teapot42

195s rear, 175s front. 175s are standard, I was misadvised that 195s would improve the grip a few years back but found no real improvement and much worse fuel consumption. I changed the front two earlier this year, was going to do all four but they didn't have two pairs at the time and I've not got around to getting the back two done for various reasons since. Wheels are otherwise standard steel rims.

However, they have been on for at least two years and as the current pair for at least 6 months and I've pushed her much harder than that in the meanwhile and had no issues. As I mentioned, the usual sign that I'm overdoing it is the front washing out wide, never had so much as a twitch from the rear in the 10 years I've been driving this car.

The roundabout does carry a fair number of lorries - it isn't far off a junction of the M60. For those who know Stockport, it is the one at the top of Lancashire Hill. I was just passing the Lancashire Hill turnoff when the back end went. The surface seems reasonable but the markings were very recently repainted, maybe a week or two ago - people are still getting used to it as they have changed the lanes. Wish they'd consult the people who use the roundabouts before doing that sort of thing but that is an aside. Certainly no break up of the surface anyway and I've taken that roundabout as fast and faster in the same or worse conditions. (I make it sound like I'm a speed merchant here...)

Does new paint on roads take a while to 'bed in' and loose the initial slipperyness? Could it just be that because it is new it caused the problem and after a few weeks it will be OK?

I must admit I've been reluctant to report this as I am worried I'll get accused of dangerous driving and get done for it...

Toyota Yaris - Help me understand a near accident - Bobbin Threadbare

I once lost all grip and had my steering lock up at a sedate 25mph as I was slowing for a roundabout down in Warrington. I had no ABS on that car either! I think there was fuel/oil on the road but it hadn't been raining. Luckily I didn't run onto the roundabout; the car stalled and I just annoyed the driver behind by re-starting and being slow to set off again.

Everyone's had a 'brown trousers' moment - I started a thread on this ages ago (had slid husband's car round a wet roundabout a bit)....some people's stories were rather hair-raising!

Toyota Yaris - Help me understand a near accident - BruceyBonus

I live near that roundabout and one day earlier this week I was going round it and glanced in my rear view mirror as I was exiting onto Sandy Lane and noticed a Clio going sideways which I thought was a tad strange!

Toyota Yaris - Help me understand a near accident - Teapot42

Sounds like a report to Stockport Highways is definitely in order in that case...

Toyota Yaris - Help me understand a near accident - bathtub tom

>>195s rear, 175s front. 175s are standard

When you renew your insurance each year, how do you reply to the question: Has the vehicle been modified in any way?

Toyota Yaris - Help me understand a near accident - Teapot42

I discussed this over the phone with my insurance company at the same time I was discussing another matter. I was advised that as the modification was not to enhance performance I did not need to declare the car as modified.

I believe this is the same as the issue which raised its head a while back as to whether winter tyres had to be declared to insurance companies and the consensus was that as they were a safety modification rather than a performance modification they didn't.

I could be wrong and it could be this only applies to my insurer but they have been made aware.

Toyota Yaris - Help me understand a near accident - bathtub tom

>> I was misadvised that 195s would improve the grip

>>the modification was not to enhance performance

I find those two statements mutually unacceptable!

Toyota Yaris - Help me understand a near accident - Teapot42

>> I was misadvised that 195s would improve the grip

>>the modification was not to enhance performance

I find those two statements mutually unacceptable!

In that case, I feel sorry for you, if you can't see how reducing the likelyhood of losing control is not an improvement in safety.

Anyway, as I've mentioned it did anything but improve performance - worse fuel consumption and as best no improvement to the original problem.

The issue was that I explained to my mechanic that I was having problems in some locations with wheelspin when setting off from a junction in damp conditions. I asked him to fit 'better' tyres at the next service to try and resolve this. By better I meant a better make, he decided that wider tyres where what was needed. I really should have challenged him but didn't. The problem is probably that as the Yaris Mk 1 is so light there isn't enough weight on the front tyres. Putting bigger tyres on was never going to improve it as there is now less weight per square inch due to a bigger contact patch.

However, as I've repeated several times in this thread and suspect I will have to repeat again before I lose interest, I have driven the car for 10 years, for over 2 years with 'incorrect' tyres and for the last 6 months in the current configuration, and have never experienced this behaviour before and I've pushed it much harder than I was on this particular day.

Toyota Yaris - Help me understand a near accident - skidpan

The issue was that I explained to my mechanic that I was having problems in some locations with wheelspin when setting off from a junction in damp conditions.

Your mechanic must be a complete numpty. You complained of wheel spin when pulling away from juctions and he fitted bigger tyres on the REAR WHEELS. How is that going to improve the car, the Yaris is FRONT WHEEL DRIVE.

Toyota Yaris - Help me understand a near accident - Teapot42

Sorry, you've missed the bit where I said all four were changed and I've only changed two back to 175 so far.

Toyota Yaris - Help me understand a near accident - skidpan

Sorry, you've missed the bit where I said all four were changed and I've only changed two back to 175 so far.

OK I missed that bit but you only put it on way after starting the thread, why not tell the whole story to begin with, more chance of getting a relevant answer.

With regards to buying part worn tyres IMHO you have to be crazy. They can come off write offs or be imported from abroad, you have no idea of their history. When you can get brand new Khumhos for about £40 each where is the saving

Toyota Yaris - Help me understand a near accident - madf

I will reiterate what I said:

check the tracking before you do anything else.

And check tyre pressures regularly.

And having different size tyres on teh car may invalidate your insurance.

And buying second hand tyres is for those who like to die unexpectedly.

Toyota Yaris - Help me understand a near accident - unthrottled

And buying second hand tyres is for those who like to die unexpectedly.

Oh, come off it! Do you immediately go to the tyre centre every time you bought a second hand car?

Do you pre-emptively replace your tyres each time you hit a pot hole too sharply, just in case the integrity of the carcass of the tyre is compromised?

If the answer to either is "no" then you're in no place to preach!

Toyota Yaris - Help me understand a near accident - madf

People sell cars becuase they are fed up/want a change.

People change tyres for other reasons: mainly because they are worn out.

The difference is rather obvious...

Toyota Yaris - Help me understand a near accident - Teapot42

What I was told is that part-worns tend to come from fleets where the tyres are changed on a regular basis whether they need to be or not. They are all checked before being sold on and have to be safe.

The point is valid - a second hand car could easily have old tyres or ones that have been abused. Hitting a pot hole could damage the tyres. Part worns at least have to be checked before they can be re-used, tyres on a second hand car don't.

That to be is quite a big difference you have glossed over...

Toyota Yaris - Help me understand a near accident - merlin

I would guess diesel on the road. Is there a fuel station nearby? Is the roundabout on a gradient?

I once spun a 4 wheel drive Impreza turbo into a hedge after skidding on a fuel spill. Luckily I managed to drive it out but there was ~£2000 of damage. I wasn't going so fast either but it had been raining and there was diesel all over the road. It happened near the top of a hill on a country road. At the bottom of the hill there's a garage. I suspect a diesel van or similar over filled his tank then set off up the hill spilling fuel all over the road.

I returned later in the day to checkout the scene only to find there were now two holes in the hedge! Someone else had had the same accident as myself... I didn't even know which hole was mine!

Toyota Yaris - Help me understand a near accident - SteveLee

The feel for grip is usually through the front end - ie the wheels the steering wheel is linked to, or through the driven wheels - in your case this is the front end on both counts. If it was damp or wet - and it's a light car with a light rear end - the rear will almost certainly lose grip first - especially as you have 195s on the rear which will give you less grip in damp/wet conditions (more likely to aquaplane). Having "more rubber on the road" doesn't always mean more grip - you can "over tyre" a car - even worse if the rim size isn't wide enough for 195 then the tyre footprint could be deformed by fitting them to the wrong rims.

It may be a diesel spill but you haven't helped matters with your daft tyre selection. Having the wrong tyre sizes won't invalidate your insurance unless they are far out enough to be dangerous - having mismatched sizes may do so. I don't know what year your car is, but if it's new enough to have anti skid control the mismatched front/rear rolling radiuses will either trigger a system fault or cause the ASC to kick in when it shouldn't or not do so when it should!

I agree with the comments above questioning buying part worns for a car with such cheap tyres in the first place - there's plenty of excellent mid-range Korean tyres that won't break the bank, If you can't afford new tyres for your car, then you can't afford the car.

Toyota Yaris - Help me understand a near accident - Teapot42

A lot of people have mentioned tyres (now fixed BTW, 175s all round) but I am still struggling to tally this with 6 months of driving with the mismatched tyres and 2 years of driving on 195s. During this time I have 'enjoyed myself' - where safe of course - and all I have ever experienced is the front washing wide, the back has never given the slightest hint of wanting to break away but this time it just went with no warning at all.

Could it really be that in 10 years of driving the same car I have found something new and totally different? It is this difference that leads me to think it is not the tyres but some other factor at play. I could be wrong, won't be the first time, but it is difficult to ignore all that experience.

As I've commented before, the times I've tried new tyres on the car I've been disappointed, something which has never happened with part-worns. Part of the reason I've put part worns on now is that I'm hoping to change my car as soon as finances allow so it didn't seem worth spending more than I needed to.

Toyota Yaris - Help me understand a near accident - gordonbennet

I did mention earlier about tyres possibly too wide for a standard wheel.

You can end up with the tread not flat if the tyre is too wide and the tyre rolling on the rim, remember a wider tyre with the same aspect ratio will be higher, adding to the roll effect.

Not saying this has happened here, but tyres reach strange angles when pushed on bends, you can see them fighting to stay on the rims at high cornering force, if the tyre is oversized it will lean over too far and more of the tread will lift from the road as it fights to keep the beads seated.

You can find charts online giving advisory wheel widths for a range of tyres.

I still think you simply found a slippery surface, and for a number of reasons the front gripped and the rear didn't.

Toyota Yaris - Help me understand a near accident - Avant

I agree entirely, GB. It seems a lot of posts when oil spillage seems by far the most likely explanation, asssuming that the OP wasn't going too fast.

Toyota Yaris - Help me understand a near accident - thunderbird

Wife had a Puma, great handling car, stuck like the proverbial to a blanket. After about 15,000 miles the fronts needed replacing, 2 new Michelins on the front were duly fitted, the original Goodyears on the rear looked almost new. The car turned into an oversteering monster especially on wet roads (at normal speeds I should add), would try and swap ends without provocation. Changed fronts and rears around and the improvement was instant, balance was back. Another 15,000 miles on the fronts needed replacing again, fitted Bridgestones without thinking about the problems new fronts caused the previous time. With the Bridgestone fronts and the Michelin rears the balance was fine, drove it like that until she sold it.

For some reason the car did not respond to one particular tyre mix. It was nothing to do with diesel, it was not a one off incident.