rudypoochris Posted August 10, 2005 Share Posted August 10, 2005 I have 15X8 rims and am having a hell of a time finding a good performance tire in a 235-255 size to fit them. Does anyone know of a 235-255 good tire that will fit a 15 inch rim with a 35-55 aspect ratio, maybe i am just retarded. I want the 235's on the front (to keep steering light and crisp) and 255's (for the power delivery) on the back, does that make sense? thanks! Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 10, 2005 Share Posted August 10, 2005 Stick to 235's all the way around, 225's would also fit well. They'll fit the rim better than 255's, and there won't be as much lateral sidewall flex. Go for around 50 aspect, 35 doesn't have very much compliance and the 50 series will actually handle better as a result. Wider in the back doesn't make sense on a Z unless you're pushing some SERIOUS hp. Even then you can make an argument that the front tires should be the same as the rear. Did a quick search at tirerack.com. Not sure if this link will work. Looks like there are no 235/50/15's, but a whole bunch of 225/50/15's. http://www.tirerack.com/tires/Compare1.jsp?width=225%2F&ratio=50&diameter=15&startIndex=0&search=true&pagelen=20&pagenum=1&pagemark=1&x=83&y=13&RunFlat=All Quote Link to comment Share on other sites More sharing options...
auxilary Posted August 10, 2005 Share Posted August 10, 2005 245/50/15 225/60/15 235/55/15 if you can find it Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted August 10, 2005 Author Share Posted August 10, 2005 I found a dunlop sp 8000 sport 245/50/15 Z rating, but they are $140 (i assume that means each) kinda steep. The reviews say it is a good tire though. I think i do not want to go to 225 that isn't very much meat and i think it will look overstretched on an 8" rim, is this true? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 10, 2005 Share Posted August 10, 2005 "Proper" tire sizing that you'll find at places like autoxes and racetracks goes like this: 6" - 185 7" - 205 8" - 225 9" - 245/255 10" - 265/275 What you usually find on the street is people putting the biggest tire on a rim that they can, which means 255's on an 8 is not uncommon. IME the 225 will handle and feel better on the 8 than a 255. If you only care about drag racing you might get better stick out of a 245 than a 225, but then you'd get better traction out of a 60 series than a 35 series for straight line acceleration too. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted August 10, 2005 Author Share Posted August 10, 2005 noted, im running 225-250hp and 300 lb ft maybe eventually upgrading to 345 by 300lb ft. With out an lsd is 225 enough? with an lsd 225 should be mroe then enough correct? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted August 10, 2005 Share Posted August 10, 2005 I'd say so. I have a NA with ~240 hp probably 200 ft/lbs, 225's work fine for me. Most VARA CP3 racers are putting down ~300 hp and they race on 225/50/14's. Your torque out of your turbo is higher than an NA engine so that might make a difference. If you want 245's that's not a totally crazy idea, I'd just put them on a 9" rim. Of course you'll find plenty of guys running them on an 8" too, so take my bias into consideration. Quote Link to comment Share on other sites More sharing options...
SR240Z Posted August 10, 2005 Share Posted August 10, 2005 rudy, im probably running the same power out of my l28 engine and im still at 5psi, but im running 16x7 panasports with 225/45/16 but i also have a Nismo 2way LSD. Gets great traction out of the whole and in the twisties. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted August 10, 2005 Author Share Posted August 10, 2005 ya those figures were form a ford 302 though so also NA wish my swap good luck, looks like 225's for me, wish 235's were more common! Quote Link to comment Share on other sites More sharing options...
johnc Posted August 11, 2005 Share Posted August 11, 2005 225/50-15s on a 15 x 8" rim: Probably the perfect combination for a 240Z. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted August 11, 2005 Author Share Posted August 11, 2005 oh wow your right those dont look stretched at all, fantastic. ANy brand suggestions. I want to stay around $400 or lower for all 4 tires Quote Link to comment Share on other sites More sharing options...
johnc Posted August 11, 2005 Share Posted August 11, 2005 Based on the reviews on Tire Rack I would try the BFGoodrich gForce Sport in 225/50-15. $81. Quote Link to comment Share on other sites More sharing options...
Forrest Posted August 11, 2005 Share Posted August 11, 2005 John, what backspace are the wheels in your picture? Thanks! Quote Link to comment Share on other sites More sharing options...
johnc Posted August 11, 2005 Share Posted August 11, 2005 4 inch. Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted August 11, 2005 Share Posted August 11, 2005 225/50-15s on a 15 x 8" rim: Probably the perfect combination for a 240Z. 4" backspace on an 8" rim = 0 offset?? Cool. Got a set of those in the garage. That car is obviously lowered. I must have 4 inches of open fenderwell above each tire with my near stock ride height. Quote Link to comment Share on other sites More sharing options...
Guest zfan Posted August 11, 2005 Share Posted August 11, 2005 A 15x8 rim is actually 9" across. If you ran 4" of backspace that means your actually 25 millimeters positive. Mike Quote Link to comment Share on other sites More sharing options...
johnc Posted August 12, 2005 Share Posted August 12, 2005 Well... the rims in the picture were (are) custom built Monocoques and when you specify backspace to them (or Kodiak for my other sets of custom wheels) backspace is actually measured to the tire bead mounting surface. Backspace is not measured to the wheel lip when ordering custom wheels. Quote Link to comment Share on other sites More sharing options...
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