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Old 1 Week Ago   #1
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Smile wrong tyre size affect my speedo?

So i bought my GP last week and it came with Wolfrace 15's which are needing changed sometime due to the offset being et35. The tyres fitted are 195/55/15, obviously this is the wrong size and will be affecting the mileage and speedo. Can anyone workout how much my speedo or mileage will be incorrect by? Thank you to anyone whom replies!
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Old 1 Week Ago   #2
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Re: wrong tyre size affect my speedo?

See for yourself;

https://tiresize.com/comparison/

But basically with those tyres you'll be going slower than what your speedo says...not by much though..if your speedo says 80 you'll be doing 75-78mph.

Not enough to worry about if you need to keep the tyres.
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Old 1 Week Ago   #3
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Re: wrong tyre size affect my speedo?

For a given actual speed, let's say 80 mph:

- the speedo with 'normal' tyre should read 80 (it never does but should)
- smaller wheels will read higher speed (needs more turn to cover the same distance)
- bigger wheels will read slower speed (needs less turn to cover the same distance)

This apply also to the podometer...

BRs, Bernie

If someone here helped You fix -or better, understand- your issue, hit the thanks icon @ bottom right corner, it's free and makes us feel helpy ;-)
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Old 1 Day Ago   #4
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Re: wrong tyre size affect my speedo?

Thank you for your replies! Much appreciated.
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