archi Posted February 29, 2016 Report Share Posted February 29, 2016 I currently have tyres on that are 225/45/18 but just wrecked one and the other front tyre is pretty low. Question is can I put on 225/40/18 as a mate had some to get rid of at a good price? Would i need to change all 4 Quote Link to comment Share on other sites More sharing options...
HDAV Posted February 29, 2016 Report Share Posted February 29, 2016 (edited) 225/40 are lower profile so smaller diameter if the car is 2wd and the tyres are the same on the axle should be fine (speedo will go slightly out) http://www.driverstechnology.co.uk/Tyre-size-coding.htm 225/40 are 2000mm circ 225/45 are 2071mm circ (both rather rough estimates) but about 20mm difference in diameter Edited February 29, 2016 by HDAV Quote Link to comment Share on other sites More sharing options...
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