adam1942 Posted January 25, 2012 Share Posted January 25, 2012 Folks I've been reading that the recommended tyre size for 19x10 wheels(front and back) is 245 front and 275 rear however on my car I've got 255 front and 275 rear.. is this to much of a difference for the TCS or will it still be happy with that? Quote Link to comment Share on other sites More sharing options...
coldel Posted January 25, 2012 Share Posted January 25, 2012 Think TCS should be fine, the only think affecting it is the rolling radius I would have thought? Quote Link to comment Share on other sites More sharing options...
hadZ Posted January 25, 2012 Share Posted January 25, 2012 I have 255 front and 295 rear and i havent had any problems with the tcs Quote Link to comment Share on other sites More sharing options...
adam1942 Posted January 25, 2012 Author Share Posted January 25, 2012 thanks guys I'm happy with that. I thought the rolling radius increased with the width of the tyre also hence being concerned? I'm really strugging to understand this lol Quote Link to comment Share on other sites More sharing options...
hadZ Posted January 25, 2012 Share Posted January 25, 2012 haha don't worry Adam your not the only one! Quote Link to comment Share on other sites More sharing options...
Ekona Posted January 25, 2012 Share Posted January 25, 2012 thanks guys I'm happy with that. I thought the rolling radius increased with the width of the tyre also hence being concerned? I'm really strugging to understand this lol Profile is what you're after here, and it's based on a percentage of the tyre width. For example (and done deliberately to keep the maths easy): A 200/50/18 tyre will have a profile wall of 100mm A 200/40/18 tyre will have a profile wall of 80mm The rolling radius will therefore be that much less on the 40 tyre than then 50 tyre. A 200/50/18 tyre has the same rolling radius as a 400/25/18 tyre, if one were to exist of course! Quote Link to comment Share on other sites More sharing options...
M13KYF Posted January 25, 2012 Share Posted January 25, 2012 yep defo profile is the important thing when changing the rim size Quote Link to comment Share on other sites More sharing options...
adam1942 Posted January 25, 2012 Author Share Posted January 25, 2012 so my tyres are 255/35/ZR19 on the front and 275/35/ZR19 on the rear so it should be fine Thanks guys! Out of interest is there a formula to work out what the rolling radius is? Also if known what is the allowed difference on the Z before TCS freaks out? Quote Link to comment Share on other sites More sharing options...
M13KYF Posted January 25, 2012 Share Posted January 25, 2012 so my tyres are 255/35/ZR19 on the front and 275/35/ZR19 on the rear so it should be fine Thanks guys! Out of interest is there a formula to work out what the rolling radius is? Also if known what is the allowed difference on the Z before TCS freaks out? http://www.tiresizecalculator.info/ Quote Link to comment Share on other sites More sharing options...
adam1942 Posted January 25, 2012 Author Share Posted January 25, 2012 Thanks Mike! Quote Link to comment Share on other sites More sharing options...
adam1942 Posted July 16, 2012 Author Share Posted July 16, 2012 wrong thread. Quote Link to comment Share on other sites More sharing options...
buster Posted July 16, 2012 Share Posted July 16, 2012 you can use this one http://www.miata.net/garage/tirecalcold.html or even better imo http://www.willtheyfit.com/ Quote Link to comment Share on other sites More sharing options...
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