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Sticky out hubs are if you only have one wheel or tyre on the axle. Sticky in hubs are if there are two wheels or tyres on the axle. I think.
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Thanks for the replies guys...
It must be more than coincidence, but in yesterday's survey the raised wheels always had sticky out hubs whereas those on the ground were sticky in...I guess Patrick's reply is sensible, in that the "optional" axle has two wheels only.
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When I read the original post I assumed "spare wheel" meant spare wheel. I have often noticed that lorry spare wheels are bolted horizontally hanging underneath a bracket. Do they use a jack to lift it into position, or are lorry drivers phenomenally strong? Try lifting a car wheel at arm's length!
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The spare wheel is on a pulley that you wind down using the wheel brace.
However it is rare for lorries to carry spare wheels
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Patrick, Smokie, I think we are getting there. The way I see it is that the sticky out bit on the wheel is so that on a twin wheeled set up you need to mate two similar sticky out wheels 'back to back' to give you the required space between the wheels. i.e. mate the sticky out bit of one wheel against the sticky out bit of the second wheel and then mount them on the axle together. You can see from this that the four wheels which make up a twin wheeled axle can then all be exactly the same so can be swapped around and changed easily. This now means that the vehicles spare wheel also needs to be compatible with the set up on both the twin wheeled rear axle, and the single wheeled front axle. The best practice for this is to use exactly the same type of 'sticky out' wheel at the front that also fits on the rear but with the 'sticky out' bit sticking out.
With regard to the lifting axles on trucks I should think most of them only have a single wheel at each side so they also will look 'sticky out' to ensure spare wheel compatibility with the twin wheel set up on the vehicles.
Next time you see a twin wheeled white van (or probably easier to see a twin wheeled transit type builders truck) take a good look at the rear wheel set up compared to the front wheel and all will be clear (I think).
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Many lorry companies lease their tyres on a pence per mile basis and do not own the tyre. When the load is light the wheels are lifted to avoid charges for that pair. When laden of course the load has to be appropriately distributed across the available axles to comply with the weight per axle limits. Some lorries carry a mileometer on the centre of the liftable axle and some are details on the Tachograph and this is provided to the tyre lease company. Regards Peter
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Leased tyres! Never heard off such a scheme. Most companies lease the lorry. I have seen the mileometers on trailers but never on the lorry itself but that is for servicing purposes. How would a tachograph provide details of how many miles a vehicle has traved with its axle lifted?
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Certainly heard of leased tyres on buses in an article a few years ago about buying classic buses/coaches for private ownership and display. Apparently you bid on the bus however the cost of the tyres is added on top dependant on mileage/treadwear.
Jim
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The correct terminology is 'inny' and outy' i'll fink you'll find.
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Steady, now we're just getting too technical.
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I once had a bellybutton like that. Don't know where it's disappeared to these past few years.........
Graeme
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Leaving the doors open indicates to the thieves,they should only spend their time, stealing your diesel, instead.This is much less time consuming, than unloading the vehicle & only requires a smaller number of them, to intimidate you whilst calling the Police.
VB
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"to intimidate you whilst calling the Police."
The time it takes to reach for the mobile, the truck driver could have selected first gear and driven away 8-)
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Echoing what others have said, lifting axles save tyre wear and reduce rolling resistance on empty or partly loaded vehicles. Lifting axles are non-driven, so lifting an axle can transfer weight to a driven axle to aid traction but this can put the drive axle over its weight limit in the process.
The other day I saw a long 3-axle rigid with its rear axle lifted. This reminded me of the legal argument over such vehicles that existed years ago - I imagine it's been resolved by now. It's to do with wheelbase and rear overhang. The rear overhang of a vehicle must not exceed 60% of the wheelbase. On a multi-axle rigid the wheelbase is the distance between the outermost wheel centres. On some vehicles with a rearmost lift-axle, if that axle is lifted it makes the effective rear overhang in excess of 60% of the effective wheelbase! This has implications bacause of the outsweep of the tail end when turning.
Cheers, Sofa Spud
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