longsh07 Posted April 15, 2016 Share Posted April 15, 2016 (edited) Just a quick one as I've not been able to find a straight answer online. forgetting about alloy size for a moment, am I right in thinking that as long as the rear tyres are a certain % larger than the fronts, traction control will be happy? Does anyone know that the difference threshold is before it gets upset? There is a 2.7% difference between the stock tyres 225/45/18 front and 245/45/18 rear. I know, as I'm currently running, 255/35/19 fr, 275/35/19 rr (2.1% diff.) cause no issues, and I've seen suggestions of running 245/35/19 fr, 275/35/19 rr (3.2% diff.) so assuming that no issue either or even 225/40/18 fr, 245/40/18 rr (2.5% diff.) is also fine for some. So if I change my wheels and tyres to fit 245/40/18 fr, 265/40/18 rr, (2.4% diff.) I assume TC will still be happy? So if anyone knows, what is the threshold? 2.7% dfference -/+ 1%? Edited April 15, 2016 by longsh07 Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted April 15, 2016 Share Posted April 15, 2016 As a rule of thumb I have found that +/- 2.5% is about the limit. Quote Link to comment Share on other sites More sharing options...
longsh07 Posted April 15, 2016 Author Share Posted April 15, 2016 Cheers Alex Sent from my HTC One M9 using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted April 15, 2016 Share Posted April 15, 2016 This is a calculator that I find most useful: http://www.brspecialtuning.co.uk/Tyre%20size%20calculator.htm Quote Link to comment Share on other sites More sharing options...
longsh07 Posted April 15, 2016 Author Share Posted April 15, 2016 I've used that one before, this is my favourite though tbh http://www.kouki.co.uk/utilities/visual-tyre-size-calculator Sent from my HTC One M9 using Tapatalk Quote Link to comment Share on other sites More sharing options...
longsh07 Posted April 16, 2016 Author Share Posted April 16, 2016 Hey Alex, just realised that -2.5% would be 0.2% difference between front and rear. Would that really work? Or have I miss understood what you mean Sent from my HTC One M9 using Tapatalk Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted April 16, 2016 Share Posted April 16, 2016 Hey Alex, just realised that -2.5% would be 0.2% difference between front and rear. Would that really work? Or have I miss understood what you mean Sent from my HTC One M9 using Tapatalk I was not comparing front to rear. I was demonstrating / calculating the difference between 1 x set of tyres with 1 x set of a difference size so that the rolling circumference would be within tolerances. Quote Link to comment Share on other sites More sharing options...
longsh07 Posted April 16, 2016 Author Share Posted April 16, 2016 (edited) I'm with you now. Cheers Sent from my HTC One M9 using Tapatalk Edited April 16, 2016 by longsh07 Quote Link to comment Share on other sites More sharing options...
Rshep1 Posted December 13, 2017 Share Posted December 13, 2017 Hoping to clarify on here instead of posting a new thread. Is the tolerance referring to the difference in rolling diameter from standard wheel and tyre specs? I have a set of 18" rpf1s to go on my z and am looking for track tyres e.g. Westlake. The fronts are 9.5j and the rears are 10.5j Any suggestions on tyre size and brand choices would be great Quote Link to comment Share on other sites More sharing options...
Ekona Posted December 13, 2017 Share Posted December 13, 2017 The trick is to keep the % rolling radius difference between front and rear the same as OEM. Do that and you should be fine. For track, I wouldn’t look further than the R888R if 18”. Quote Link to comment Share on other sites More sharing options...
longsh07 Posted December 13, 2017 Author Share Posted December 13, 2017 1 hour ago, Rshep1 said: Hoping to clarify on here instead of posting a new thread. Is the tolerance referring to the difference in rolling diameter from standard wheel and tyre specs? I have a set of 18" rpf1s to go on my z and am looking for track tyres e.g. Westlake. The fronts are 9.5j and the rears are 10.5j Any suggestions on tyre size and brand choices would be great As @Ekona says, front/rear. Stock difference is 2.73% front to rear. I've run 19x8.5 and 19x9.5 (255/35 and 275/35) which is 2.12% different, and currently on 18x8.5 and 18x9.5 (245/40 and 265/40) which is 2.45%. neither had any TC problems. Personally I really like Yokahama AD08R's (current choice), not a 'true' track day tyre but very good! Quote Link to comment Share on other sites More sharing options...
Rshep1 Posted December 13, 2017 Share Posted December 13, 2017 1 hour ago, longsh07 said: As @Ekona says, front/rear. Stock difference is 2.73% front to rear. I've run 19x8.5 and 19x9.5 (255/35 and 275/35) which is 2.12% different, and currently on 18x8.5 and 18x9.5 (245/40 and 265/40) which is 2.45%. neither had any TC problems. Personally I really like Yokahama AD08R's (current choice), not a 'true' track day tyre but very good! I'm struggling for actually finding tyres in the sizes I'm needing. As it stands I can't find any Yoko's or toyos in the right size. My best at the moment seems to be Westlake's from tarmac sportz in a 235/40 front and a 285/35 rear. The ratios should be okay at that but may be a bit much of a stretch on the fronts Quote Link to comment Share on other sites More sharing options...
Ekona Posted December 13, 2017 Share Posted December 13, 2017 R888R in 235/40 and either 265/35 or 275/35 will do you just fine. 285 rear is really excessive unless you're running massive power, especially on track rubber where you've got masses of extra grip anyway. Tbh, if you're running track rubber then you'll likely want to be running with the TCS off anyway, which makes the debate redundant. FWIW, I used to run 225/40 and 245/40 R888 on my old car and never had issues, nor a lack of grip Quote Link to comment Share on other sites More sharing options...
andy james Posted December 13, 2017 Share Posted December 13, 2017 Currently running a square set up on my Rays for competitions. Toyo R888R 245/40/18 all round with no TC issues. Loads of grip but very noisy at motorway speeds. Quote Link to comment Share on other sites More sharing options...
KuroKiddo Posted December 13, 2017 Share Posted December 13, 2017 I'm running a close to square set up on 10x18 and 11x18, 255/35/18 and 265/35/18 Nangkang NS2R, no problem with TC I've found. Quote Link to comment Share on other sites More sharing options...
Rshep1 Posted December 14, 2017 Share Posted December 14, 2017 Where do you guys get your tyres from? I can't seem to find any sites that sell ado8, R888, ns2r etc. In these sizes mentioned. Quote Link to comment Share on other sites More sharing options...
Ekona Posted December 14, 2017 Share Posted December 14, 2017 Demon tweeks have pretty much exclusive sales in the R888R (note the extra R) these days. Just checked and they’re in stock right now. Tried Camskill, Black Circles etc? Where are you looking? Quote Link to comment Share on other sites More sharing options...
brillomaster Posted December 14, 2017 Share Posted December 14, 2017 tyreleader.co.uk work good for me, plenty of supply of AD08Rs, NS-2Rs and R888Rs. However my personal choice is Federal 595 RS-Rs. Quote Link to comment Share on other sites More sharing options...
bc1987 Posted December 14, 2017 Share Posted December 14, 2017 this is about the best match I could get for Federal RSR's. anyone want to tell me it wont work? will the 265 fit on standard rays? Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted December 14, 2017 Share Posted December 14, 2017 Yes, the 265 will fit a standard 18" Ray. I used to run the Federal RSR (amongst others) on my 350 until I recently changed to Yokohama A052's I think that I may still have a new set of RSR's in stock, so if you decide to go that route then let me know and I will confirm the sizes and work out a deal for you. Alex. Quote Link to comment Share on other sites More sharing options...
Rshep1 Posted December 14, 2017 Share Posted December 14, 2017 I've looked on camskill, tyre leader, demon tweeks etc. Maybe they didn't have the sizes I was looking for initially. I'll try a few other sizes and see what I can find Quote Link to comment Share on other sites More sharing options...
bc1987 Posted December 14, 2017 Share Posted December 14, 2017 1 hour ago, ZMANALEX said: Yes, the 265 will fit a standard 18" Ray. I used to run the Federal RSR (amongst others) on my 350 until I recently changed to Yokohama A052's I think that I may still have a new set of RSR's in stock, so if you decide to go that route then let me know and I will confirm the sizes and work out a deal for you. Alex. Cheers man, I am thinking when I need new tyres as currently on potenza sp001's which are nearly new. I will give you a shout 1 Quote Link to comment Share on other sites More sharing options...
StevoD Posted December 14, 2017 Share Posted December 14, 2017 235/40/18 front 265/35/18 rear Seem to have worked for some people apparently Quote Link to comment Share on other sites More sharing options...
Rshep1 Posted December 15, 2017 Share Posted December 15, 2017 Ordered some nankang ns2r's today. Hopefully get the wheels refurbed and get them on the car just after Xmas. Thanks for the help guys Quote Link to comment Share on other sites More sharing options...
nissanman312 Posted December 15, 2017 Share Posted December 15, 2017 (edited) 5 hours ago, Rshep1 said: Ordered some nankang ns2r's today. Hopefully get the wheels refurbed and get them on the car just after Xmas. Thanks for the help guys Just saw this My pals sponsored by nankang and I think he is able to do a small discount on them I'll ask him next time for you..he runs his race car on AR1s and he winning races so can't be bad This is his in demon tweek Edited December 15, 2017 by nissanman312 Quote Link to comment Share on other sites More sharing options...
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