pedrosixfour Posted August 1, 2013 Author Share Posted August 1, 2013 (edited) Mine are on 11.5" rears chaps. The change in straight line traction from 275-35-18 to 315-35-17 was staggering. I put it all down to the increased sidewall...with hot tyres it won't spin up on a hot, dry, smooth road in 3rd gear any more GODDAMMITTTTT!! Did you get the rims banded then mate? Is that possible with forged rims as well? edit: Actually, looking at the shots of your car, I should've realised they weren't 9.5" or even 10" rims you were using. The tyres sit flush with the lip of the rims. Very nice by the way Dan. Edited August 1, 2013 by pedrosixfour (see edit history) Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted August 2, 2013 Author Share Posted August 2, 2013 All this bollox and then I'm duly informed today that Kumho don't even make the 315/35/17 tyres anymore. What a load of crap. Poxy 17" rims and their pansy sized tyres. Why do I insist on picking the dead-end every friggin' time?? Quote Link to comment Share on other sites More sharing options...
Nic Posted August 2, 2013 Share Posted August 2, 2013 Toyo Proxes R888 tyres are available in 315/35R17, dry weather only. http://www.camskill.co.uk/m117b0s692p0/Track_Day_Tyres_-_Trackday_Tyres_-_Motorsport_Tyres_-_17_inch_R17_inch_-_315_35_17_315_35R17 Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted August 2, 2013 Author Share Posted August 2, 2013 I've sent them an email to see when they might be getting another 255/40 into stock as they only have one! I need 4 tyres you see, a pair of 255/40 for the front & a pair of something larger for the rear. They're a good price at the moment an' all. Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted August 5, 2013 Author Share Posted August 5, 2013 Camskill are only selling what Toyo tyres they have left in stock and then are having no more to do with the brand. I've decided to go for a set of Kumho tyres, 235/40/17 up front and 255/40/17 at the rear. That'll be the last set of track tyres I look for in 17", I'll still use the 17" rims, but with good road tyres for use as a wet set. I'll pick up a set of 18" rims so I can have an actual choice of size, compound & brand in proper track tyres in future. Quote Link to comment Share on other sites More sharing options...
Dnk Posted August 6, 2013 Share Posted August 6, 2013 These could be worth a look They appear to come 17" & 18" as well, we use Avon CR500 race tyres on my sisters Alfa and they work really well in the wet or dry. http://www.avonmotorsport.com/road-legal/performance/zzr Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 6, 2013 Share Posted August 6, 2013 Only cars with exceptionally good camber control work well with very wide rims and tyres. Sadly the MKIV has pretty bad camber control, especially on the rear where presumably Toyotas attempt to keep a usable rear load space depth compromised the available distance between top and bottom rear suspension arms. So very wide tyres on a MKIV used on track are often slower and less predictable than something closer to OE. To use very wide tyres and rims effectively would need a lot of expensive pick up point mods and wheel well alterations. Plus you should NEVER run a tyre at the widest end of the recommended spec for a given rim width if you want the best handling, as side wall support suffers and the tyre footprint is destabilised. Bigger is often NOT better Better to go to the narrower end, to mid range of the tyre width to rim width guide. Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted August 6, 2013 Author Share Posted August 6, 2013 Better to go to the narrower end, to mid range of the tyre width to rim width guide. That was my original intention Chris, I was looking for 275 tyres for the 10" rear rims and 255 tyres for the 9" front rims but the selection in 17" is abysmal, what few brands that were available (up until recently) went from 255 to 315 in their 17" range of road legal track tyres. Which is why I'll have a set of 18 x 9" & 18 x 10" rim for the next time I am looking for tyres as the widths increase in 10mm increments right up to silly proportions which I'll never even need to consider as I'll have what I want, a 265 or 275 width rear tyre. Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted August 6, 2013 Author Share Posted August 6, 2013 These could be worth a look They appear to come 17" & 18" as well, we use Avon CR500 race tyres on my sisters Alfa and they work really well in the wet or dry. http://www.avonmotorsport.com/road-legal/performance/zzr The range is capped at 255 width in 17" mate, while the tyres themselves may be better made than what I've ordered there really is no point considering them until I need replacements. What might be worth a look at is their rather decent selection of slicks in a 17" diameter mate. I'd like a set, solely for track days and the experience, and Avon seem to do a selection of sizes for my rim widths. Thanks for the link. Quote Link to comment Share on other sites More sharing options...
Dnk Posted August 6, 2013 Share Posted August 6, 2013 Yes i saw the sizes and thought on a stock set of 17's they were not far off perfect. 225 45 on the front and 255 40 on the rear. Its a shame the CR500's we use don't come in bigger sizes as they are really good. Quote Link to comment Share on other sites More sharing options...
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