greasyphil Posted December 15, 2016 Share Posted December 15, 2016 i have 19" rims with 35 profile tyres, i would like a bit more rubber between me and the road looks like i could fit 40 profile will it cause a problem with the traction control? with tyre wear and going round corners etc the ecu wont notice? Quote Link to comment Share on other sites More sharing options...
greasyphil Posted December 15, 2016 Author Share Posted December 15, 2016 i forgot to mention, im thinking to replace only the rears with 40's as the fronts have plenty of tread Quote Link to comment Share on other sites More sharing options...
BobbyZ Posted December 15, 2016 Share Posted December 15, 2016 Depends on the exact sizes fitted on both, but it could cause TC issues, yes. Quote Link to comment Share on other sites More sharing options...
KyleR Posted December 16, 2016 Share Posted December 16, 2016 Your current F/R difference is 3%, if you upped it to 40 profile tyres on the rear it would be 7%, which is quite a jump. However, to the TCS it would appear the rear is rotating slower due to the larger rolling radius, so I am unsure how the TCS would react to that. Quote Link to comment Share on other sites More sharing options...
Ekona Posted December 16, 2016 Share Posted December 16, 2016 Not worth the risk. Replace them all and make the jump even, or replace with the same. Quote Link to comment Share on other sites More sharing options...
StevoD Posted December 16, 2016 Share Posted December 16, 2016 alsong as you jump both front and rear up to 40s you will be fine Quote Link to comment Share on other sites More sharing options...
Rocket_Rabbit Posted December 30, 2016 Share Posted December 30, 2016 Seems strange that people are making calcs on wheel circumferences based on profile, but with no mention of tyre widths on which to base that profile! I have ran different sizes front rear. Currently running 245/35/18s all round. Front have pretty much same circumference as stock, rears smaller. You also have to remember that the TCS system must make allowances for tyre wear. New tyres on front, old on rear and you could have a 12mm+ diameter discrepancy, not to mention tyre manufacturer discrepancies in what they deem a 245/35/18 (or whatever tyre size) is. You change in profile will make no difference, the TCS will work fine. Quote Link to comment Share on other sites More sharing options...
StevoD Posted December 31, 2016 Share Posted December 31, 2016 Well it will though Quote Link to comment Share on other sites More sharing options...
peggers350 Posted January 11, 2017 Share Posted January 11, 2017 so if you match 40's on the front to 40's on the rear it should be ok? my current setup is 235 40 19 an 275 40 19 on the rears but currently not fitted yet. was thinking the same thing if it will throw the traction control out Quote Link to comment Share on other sites More sharing options...
BobbyZ Posted January 11, 2017 Share Posted January 11, 2017 The height of the sidewall profile * tyre width profile is given as a percentage, so 235/40 means the sidewall will be 235 * 0.4). You'll need to calculate the difference that you're going to create from standard, and find out what the tolerance of the TCS is to determine if you'll cause issues. This might help: http://www.willtheyfit.com/#isPage=1 Quote Link to comment Share on other sites More sharing options...
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