will 1 inch effect speedo reading

[gti genty]

aup lads i just wondered if changing my alloys from 16s to 17s will effect my speedo reading as i cant afford to go driving by the yellow boxes 

[thatwillis]

If your speedo says 30 chances are your really doing only 27-28. As they are set so that you think you are going faster than you are. You will see the difference between speeds when driving with a satnav.

So you dont need to worry 

[bbewekim]

It may do yes, however it usually makes your speedo say your going faster than you actually are . So speedo says 40... Your probs doing 35-38 kind of thing. I know ive gone through plenty of speed cameras at the designated speed and im running 18s...

[Wayne]

If you use the correct size tyres then the speedo will be correct.

[chrisr103]

The profile of the tyres will compensate the change from 16" to 17" so the rolling radius should be about the same

[tom-gardiner]

The profile of the tyres will compensate the change from 16" to 17" so the rolling radius should be about the same

+1