Curtiz
Member
Registered: 22nd Feb 06
Location: Belfast
User status: Offline
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sorry if this has been done before but i was talking to someone today about alloys and he said if i get 16's i will have to adjust my dials and all...is this true?
and if i were to get 15's do i really have to have a 45 wall? he said the 50 would be too big
thanks in advance 
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Adam-D
Member
Registered: 11th May 02
Location: Cheshire
User status: Offline
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i had 15's with 50 profile and my speedo was fine
16's would be fine too
as far as i know they are in error anyway depending on the year of your car
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Curtiz
Member
Registered: 22nd Feb 06
Location: Belfast
User status: Offline
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so a 96 with 1's would be fine?
(sorry just need to make sure  )
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IvIarkgraham
Premium Member
Registered: 27th Mar 04
Location: Ellesmere Port, Cheshire
User status: Offline
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i am using 16's with a 45 profile tyre
i have no problems with the speedo
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dna23
Member
Registered: 1st Nov 04
Location: Northamptonshire
User status: Offline
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I don't have that much of a problem tbh only roughly 1-2mph out if that (when comparing speedo to GPS at low speeds)
And i don't know if or how you can 'adjust' a speedo anyway mate
Just roll with it no pun intended
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Marc
Member
Registered: 11th Aug 02
Location: York
User status: Offline
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When changing alloys for bigger ones you choose a lower profile tyre to compensate for this.
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Rob_Corsa
Member
Registered: 4th Apr 02
Location: Derbyshire
User status: Offline
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http://www.rochfordtyres.co.uk/tyrecalc.asp
Try that, as said if your reduce the profile of the tyre itself the rolling radius of the tyre will stay the same
And I doubt you could adjust your speedo if it was necessary anyhow
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