jamesmark Posted December 29, 2005 Share Posted December 29, 2005 hi guys/gals does anyone know or if you have the same style on your suprs what tyre pressure my tyres should be they are 19" 235 35 zr all round as just bought my first supra 3 days ago cheers guys Quote Link to comment Share on other sites More sharing options...
supRo Posted December 29, 2005 Share Posted December 29, 2005 about 34-36 psi, If you can fit wider tyres on the back, I would do that when you come to replace the rears - 265's would be good for the rears. Quote Link to comment Share on other sites More sharing options...
Nic Posted December 29, 2005 Share Posted December 29, 2005 As Ro says, 235's on the back of a TT are too small, what wheel widths have you got fitted front and rear? I generally run 30psi on the front, 34psi on the rear (F 18/40/245, R18/35/285) Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted December 29, 2005 Share Posted December 29, 2005 I'd put 36 psi in the fronts at least. That was the stock pressure and I wouldnt want to run with a low psi on low profile rubber just incase you hit a pothole or something. Quote Link to comment Share on other sites More sharing options...
merckx Posted December 29, 2005 Share Posted December 29, 2005 As Ro says, 235's on the back of a TT are too small, what wheel widths have you got fitted front and rear? Yeah that! 235 on the rear is way too narrow, be very careful or the rear end will step right out if use too much power. Bare in mind that you'll need to check out the "wheel width". if you want to put wider tyres on. When I bought mine the tyres were too wide for the wheel , the result was a very large split on the inside sidewall. Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 29, 2005 Author Share Posted December 29, 2005 what wheel widths have you got fitted front and rear?/QUOTE] i have not got a clue on the size of the wheels but will check tonight and let you know Quote Link to comment Share on other sites More sharing options...
merckx Posted December 29, 2005 Share Posted December 29, 2005 This is handy, you can fill in the boxes and it will tell you if the tyres fit the wheel.Supra Tyre fitment.xls Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 29, 2005 Author Share Posted December 29, 2005 they may well be 8" they are the fox rs 5 alloy Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 29, 2005 Author Share Posted December 29, 2005 they are 9" on the back Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted December 29, 2005 Share Posted December 29, 2005 Should be 9.5 really. Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 29, 2005 Author Share Posted December 29, 2005 its only roughly at moment they may well be 9.5 what size should i have tofit 265 -285 on the rears? Quote Link to comment Share on other sites More sharing options...
JohnA Posted December 30, 2005 Share Posted December 30, 2005 are you aware that handling degrades very rapidly as you deprart from the standard rim/tyre sizes? Just because you think that you've managed to cram a 285 in a thin rim doesn't make it any better. In fact the contact patch will be probably LESS because it will have ballooned. Best to ask here the resident expert on suspension/handling, Chris Wilson. Quote Link to comment Share on other sites More sharing options...
Bobbeh Posted December 30, 2005 Share Posted December 30, 2005 I would try to stick to stock sizes unless you're planning power mods. 255's on the rear, you can go larger. I have 285's on a 10 inch rim, but even thats fat and partially to protect the rear wheels. Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 30, 2005 Author Share Posted December 30, 2005 not quite sure on cramming anything as i am running 235 as mentioned above and was wondering what width my rim should be to go up a size to possible 265 - 285 to improve the grip on the back end as i have had it slip a few times on me Quote Link to comment Share on other sites More sharing options...
JohnA Posted December 30, 2005 Share Posted December 30, 2005 Another approach might be to use the extra money of wider rims/tyres to get a RLTC fitted, which would fix the backend issues far more effectively. Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 30, 2005 Author Share Posted December 30, 2005 cheers john, as this is my first supra relying on you guys for guidance how much does the rltc come in at? i am not looking for any power increases yet just want stable handling as the power in the supra is enough for me just now Quote Link to comment Share on other sites More sharing options...
Nic Posted December 30, 2005 Share Posted December 30, 2005 Personally I would fit a set of correct size wheels/tyres first, rather than the RLTC. I would sell you 19's with the tyres on ebay and either get a set of new wheels in the correct size (give me a shout if you want prices) or a set of second hand stock 17's. At the moment your handling will be compromised by the wheel/tyres fitted, the RLTC will stop you from getting in trouble in most cases, but will not improve the handling. A set of correctly sized wheels/tyres should improve the overall handling. Quote Link to comment Share on other sites More sharing options...
JohnA Posted December 30, 2005 Share Posted December 30, 2005 Very true. To give you an idea of the whole 'large wheel' fallacy, mine came with 'bling' 18" wheels which I promptly sold and replaced with refurbished stock 17" from a member here on this board. After changing the shocks (also from a trader of this board) and getting a 4-wheel alignment the handling is excellent. Correctly sized wheels/tyres and pressures will go a long way in fixing deficient handling. (get some quotes on a set of 19" tyres and compare it to that of a 17" set. It will fund the RTLC in one go perhaps:D . If not, then the first encounter with a pothole that will knacker a 19" wheel certainly will;) ) Quote Link to comment Share on other sites More sharing options...
terawua Posted December 30, 2005 Share Posted December 30, 2005 are you aware that handling degrades very rapidly as you deprart from the standard rim/tyre sizes? Just because you think that you've managed to cram a 285 in a thin rim doesn't make it any better. In fact the contact patch will be probably LESS because it will have ballooned. Best to ask here the resident expert on suspension/handling, Chris Wilson. This is true, at least in my opinion - I changed back to standard size from over width tyres when I last changed and I noticed that the car feels better Quote Link to comment Share on other sites More sharing options...
merckx Posted December 30, 2005 Share Posted December 30, 2005 not quite sure on cramming anything as i am running 235 as mentioned above and was wondering what width my rim should be to go up a size to possible 265 - 285 to improve the grip on the back end as i have had it slip a few times on me Use the excel file that I posted earlier! It's good, it tells you what size tyre you can use on a particular size wheel. Like Bobbeh said, you want at least 255 on the back for a standard car! Quote Link to comment Share on other sites More sharing options...
JohnA Posted December 30, 2005 Share Posted December 30, 2005 the manufacturer fitted 255/40 on a 9.5"wheel. That's a pretty good starting point I'd think, if you don't have reason to believe that another size will work better with your setup. Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 30, 2005 Author Share Posted December 30, 2005 arrrrrrrrrrrrrrrrrggggggggggggggghhhhhhhhhhh my heads gonna go pop, so much info for a novice cheers guys will look at doing well most of the things on there that you have mentioned shame as i liked the 19" on them makes the car look so sweet but hey i can live with stock wheels if its going to make the car better then its worth the sacrafice and cheers merc for the file i had a look and its very helpful but as a novice what does offset mean? what shoudl mine be? sorry guys not got a clue but we all have to start somewhere i guess Quote Link to comment Share on other sites More sharing options...
Nic Posted December 30, 2005 Share Posted December 30, 2005 James have a read of these articles, they explain offset and why correct wheel size is so important. http://planetsoarer.com/offset/offset.htm http://planetsoarer.com/offset/studs.htm (Links courtesy of garethr ) Quote Link to comment Share on other sites More sharing options...
jamesmark Posted December 30, 2005 Author Share Posted December 30, 2005 cheers will have a look Quote Link to comment Share on other sites More sharing options...
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