Changing to a deeper profile tyre?

I wish to change my tyres for a deeper profile.
It currently has 215/45 R17W and I wish to improve the comfort and protect the rims better from kerb damage.
Can I fit a deeper profile such as 50 or 55?
Will the speed be very inaccurate if I do?

I know that I would have to advise the insurance company.

Asked on 21 August 2012 by crf

Answered by Honest John
No. You have to go down to a smaller 15" wheel size to fit a deeper profile tyre.
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