Banz Posted August 25, 2016 Share Posted August 25, 2016 Was told by my colleagues that I have 19" tyre so my speed is always higher than the speedometer reading unless the computer has been adjusted for 19". Is that true? Quote Link to comment Share on other sites More sharing options...
ilogikal1 Posted August 25, 2016 Share Posted August 25, 2016 Not if you've got the right size tyre on. More wheel, less tyre, same rolling radius. 1 Quote Link to comment Share on other sites More sharing options...
evest Posted August 25, 2016 Share Posted August 25, 2016 Not necessarily. Depends if the outer diameter of the whole wheel+tyre has changed. Ie - 18" wheel with fat tyres could be the same outer diameter as 19" wheels with skinny tyres. Quote Link to comment Share on other sites More sharing options...
RS8055 Posted August 25, 2016 Share Posted August 25, 2016 Yeah, as above... it depends on how large the profile of your tyre is. If you've gone up to a 19" wheel, the tyre profile should be smaller... as long as you have the the same outer diameter of the tyre, nothing will have changed. Quote Link to comment Share on other sites More sharing options...
brillomaster Posted August 25, 2016 Share Posted August 25, 2016 (edited) as above wheel size isn't the important factor, its the rolling circumference of the tyres you have fitted. They might be confusing the wheel speed with tyre pressure monitoring systems, which work out if a tyre is deflated by how quickly its rolling relative to the other wheels, and would need to be reset if the rolling radius changes. But again, if the tyre is correctly sized for the new larger wheel, the number of rotations a wheel does will be equal on 18s and 19s. And my zed didn't have TPMS anyways! Edited August 25, 2016 by brillomaster Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted August 25, 2016 Share Posted August 25, 2016 This site is good to compare the speed difference as well as other information relating to tyre sizing. https://tiresize.com/comparison/ Quote Link to comment Share on other sites More sharing options...
BobbyZ Posted August 25, 2016 Share Posted August 25, 2016 You need new colleagues Quote Link to comment Share on other sites More sharing options...
KyleR Posted August 25, 2016 Share Posted August 25, 2016 Ignore all friends/mates/colleagues who drive diesel German barges 2 Quote Link to comment Share on other sites More sharing options...
jamez87 Posted September 3, 2016 Share Posted September 3, 2016 I used thiswhen swapping from 18s to 19s http://www.willtheyfit.com/#isPage=1 Quote Link to comment Share on other sites More sharing options...
Banz Posted September 3, 2016 Author Share Posted September 3, 2016 Ignore all friends/mates/colleagues who drive diesel German barges Lol the one told me that does drive a diesel bmw. Quote Link to comment Share on other sites More sharing options...
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