rickya Posted January 19, 2007 Share Posted January 19, 2007 Following on from my thread a couple of days ago about the differences between T1-R which replaces T1-S, I have taken the plunge about T1-S's. Definetley the T1-R is a better tyre, around hard corners, especially in dry due to a firmer sidewall. But due to the fact I had already blown a bit on new 19" alloys & didn't want to get thrown out of the house by the Mrs £400 seemed like the right price! Quite a good deal for 2x 245/40/19 & 2x 275/35/19, inc Vat & delivery for £400. It was either these or Nankang NS2's from mytyres at £450 all in. (Nankang being a budget sports tyre). The only issue with the T1-S is that as they are being phased out & if I get an unrepairable bad puncture in a e.g years time, it could be a pulavah getting hold of a T1-S. But you cant have your cake & eat it as they say..... Quote Link to comment Share on other sites More sharing options...
Removed Posted January 19, 2007 Share Posted January 19, 2007 245x40 fronts, is the ratio still ok for the tcs? Quote Link to comment Share on other sites More sharing options...
charlied Posted January 19, 2007 Share Posted January 19, 2007 BARGAIN!!! Where from? Quote Link to comment Share on other sites More sharing options...
rickya Posted January 19, 2007 Author Share Posted January 19, 2007 What do you think it, is it wrong??!! Quote Link to comment Share on other sites More sharing options...
rickya Posted January 19, 2007 Author Share Posted January 19, 2007 Leigh tyres. Quote Link to comment Share on other sites More sharing options...
Removed Posted January 19, 2007 Share Posted January 19, 2007 well normally it would have been 245x35 not sure if it causes enough of an error to be noticeable though. have a search on here about tyre size, there should be quite a lot of info about rolling radius etc Quote Link to comment Share on other sites More sharing options...
Rob_Quads Posted January 19, 2007 Share Posted January 19, 2007 2.9% difference between standard rolling radius and 245/35s (larger) 3.7% difference between 245/35 -> 245/40 (larger) Quote Link to comment Share on other sites More sharing options...
lomoto Posted January 19, 2007 Share Posted January 19, 2007 difference between front and rear rolling radius is only 0.52% or 10.99 mm so I think you should have no probs with the TCS system with the tyre sizes you are getting Ricky Quote Link to comment Share on other sites More sharing options...
rmmackfc Posted January 19, 2007 Share Posted January 19, 2007 400 sheets, i'd be off with them before some starts askin questions! Quote Link to comment Share on other sites More sharing options...
rickya Posted January 20, 2007 Author Share Posted January 20, 2007 Cheers all for advice. After doing some research and getting advice from you guys on the forum I decided that the rears choice was simple the front a little more complicated. The (19" on 9.5" width alloy / 20mm offset allround) rears would be very good in 275/35 but I would have prefered maybe 285 purely for more rim protection. But there are not that many companies that produce 285/35 size & they are more costly. The fronts are a difficult choice for me due to comfort, understeer & TCS/Rolling Radius issues. Due to the weight of the engine being over the front wheels & the obvious forces on the tyres on hard braking; cornering; & the most of all the crappy bumpy roads around here, I preferd not to go for 40 & not 35 profile. I also had to keep the rolling radius within certain limits so that the Traction control doesnt get confused & start cutting in unnecceasarily. Finally there was post earlier this year by CDR_UK which was quite useful & made me think of understeer issues - It is known that there is a excessive turn in understeer when pushed hard so CDR following Japanese tunning company examples reduced the sidewall height of the front tyres. So he went down to 40 profile on the front to stiffen the sidewalls & keeping the tyre width the same. I have gone down to 40 profile but have unfortunately increased width to 245. I wanted 225 or 235 but due to my budget on tyres I had to get what they had at the price which was 245/40. When the next tyre change comes round I will go to 225 (or maybe 235 for rim protection?) with the 40 profile. By increasing the width of the front tyres I am only adding to the understeer problem, therefore keeping the width to 225 & stiffening the sidewall height by going down to 40 would have been ideal. There are also greater rolling road differences with 245/40 rather than 235 or 225 / 40. (re: Rochford tyres tyres sive calculator) http://www.rochfordtyres.co.uk/tyrecalc.asp. On the topic of tyres size calculators: I first worked out diff betwwen old fronts & new fronts & then old rears & new rears diff. Made sure these were not too much. Then the diff between old fronts & old rears figure (due to stagger & profile diff) should be as close to the new diff between front & rear figure. This would have been ideal with 235/40 on the front. Yes £400 is a great price, should be delivered to me on Monday. Alloys arrived yesterday & they are lovely!!!! B) With the alloys I ordered locking nuts, I just have to order that AF-250 spray & find a good place to do a full laser alignment & fitting. My local fitter is good but doesnt have those expensive laser machines. Final question I'l need to address are tyre pressures which can be trial & error, but any help appreciated to get me started Quote Link to comment Share on other sites More sharing options...
Removed Posted January 20, 2007 Share Posted January 20, 2007 there is no understeer problem outside the RE040, in my personal experience, and that's only in the wet too. btw the 2007 Z will have RE050 as oem tyres tyre pressure stays at 35psi Quote Link to comment Share on other sites More sharing options...
Stew Posted January 20, 2007 Share Posted January 20, 2007 I have RE050 tyres on the front. I have found them fine. The front end doesn't understeer and I have found these ok even in the wet. I was wondering about getting these for the rear too (when they need replaced.) Quote Link to comment Share on other sites More sharing options...
stuey Posted January 20, 2007 Share Posted January 20, 2007 good deal rickya..... Quote Link to comment Share on other sites More sharing options...
rickya Posted January 20, 2007 Author Share Posted January 20, 2007 The understeer is something I have read about a couple of times & was something they were discussing once on a Palmer motorsport day I went on, but I suppose they were comparing the zed to the twitchy oversteer of a ferrari 360 etc Quote Link to comment Share on other sites More sharing options...
Removed Posted January 21, 2007 Share Posted January 21, 2007 well if they were still on RE040's then it's more than possible Quote Link to comment Share on other sites More sharing options...
rickya Posted January 23, 2007 Author Share Posted January 23, 2007 Got delivery this morning Those 275/35/19's are massive!!!! Ordered the AF-250 (stops corrosion on stainless steel lip/dish) spray yesterday. Quote Link to comment Share on other sites More sharing options...
lomoto Posted January 23, 2007 Share Posted January 23, 2007 wheel/ tyre photos required.......like now Quote Link to comment Share on other sites More sharing options...
Ian Posted January 24, 2007 Share Posted January 24, 2007 :teeth: Quote Link to comment Share on other sites More sharing options...
rickya Posted January 24, 2007 Author Share Posted January 24, 2007 Heres a sneak preview for all you inquisitive people!! ps though I have cut out the interesting bits for later!! Quote Link to comment Share on other sites More sharing options...
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