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Author Topic: 50 Instead of 55 Profile Tyres  (Read 1703 times)

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ClarCE

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50 Instead of 55 Profile Tyres
« on: 29 March 2007, 13:33:58 »
All, I have an urgent one here:

Will putting 50 profile tyres on 16" wheels cause MOT failure?  There were 2 wheels with 50 profile on when I bought them, and as they were cheaper I got them instead of 55's..

This is urgent, fitting station are ready for me now..

Many thanks in advance,

Chris.
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Kevin Wood

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Re: 50 Instead of 55 Profile Tyres
« Reply #1 on: 29 March 2007, 14:00:15 »
As long as you don't mix different sizes and they're not obviously wrong for the car I don't think you'll have a problem.

Speedo calibration will go out slightly...

Kevin
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Kevin Wood

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Re: 50 Instead of 55 Profile Tyres
« Reply #2 on: 29 March 2007, 14:01:10 »
Incidentally, have a look at the manual at http://www.motuk.co.uk and see what the requirements are wrt tyres.

Kevin
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Kevin Wood

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Re: 50 Instead of 55 Profile Tyres
« Reply #3 on: 29 March 2007, 14:05:28 »
.. and you can actually mix tyres of different aspect ratio, just not on the same axle, however, you may well get an ABS / TC light on if the system detects a difference in tyre diameter.

Kevin
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ians

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Re: 50 Instead of 55 Profile Tyres
« Reply #4 on: 29 March 2007, 14:35:40 »
Chris, You may also have insurance problems in the case of an accident if you use an unapproved size/profile/rating.

Cheers
Ian
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STMO123

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Re: 50 Instead of 55 Profile Tyres
« Reply #5 on: 29 March 2007, 14:40:11 »
Quote
All, I have an urgent one here:

Will putting 50 profile tyres on 16" wheels cause MOT failure?  There were 2 wheels with 50 profile on when I bought them, and as they were cheaper I got them instead of 55's..

This is urgent, fitting station are ready for me now..

Many thanks in advance,

Chris.

The "fitting station" should be more than aware of any legislation reguarding tyres. It's their job >:(


If you do decide to fit 50's, have a look here:

http://www.miata.net/garage/tirecalc.html
« Last Edit: 29 March 2007, 14:47:41 by STMO123 »
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ClarCE

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Re: 50 Instead of 55 Profile Tyres
« Reply #6 on: 29 March 2007, 16:04:46 »
All sorted, thanks guys - 2.5% faster according to that STMO, so 60mph on the speedo is actually 58.5mph in reality..

Gone from 205x65x15 to 225x50x16.

Thanks again guys, I'll post some pics when I've finished fitting them and have refinished the centre caps..

Chris.
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Danny

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Re: 50 Instead of 55 Profile Tyres
« Reply #7 on: 29 March 2007, 16:21:31 »
i believe the legal limit of speedo difference is 2.5%, which would suggest you're legal!

were your original 15" wheels factory standard?
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ClarCE

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Re: 50 Instead of 55 Profile Tyres
« Reply #8 on: 29 March 2007, 16:29:18 »
Quote
i believe the legal limit of speedo difference is 2.5%, which would suggest you're legal!

were your original 15" wheels factory standard?

I can only guess so Danny - on car when I bought it about 8 weeks ago..
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-MAV-

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Re: 50 Instead of 55 Profile Tyres
« Reply #9 on: 29 March 2007, 16:38:27 »
 ;D here in Ukraine nobody cares (except myself :) ), what tyres do i use.... :)
of course formally they must do it, but when it comes to real world....  :)
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