G.I.jonas Posted May 11, 2007 Share Posted May 11, 2007 Im wondering if there is any formula for calculating appropriate tire sizes for a given wheel.I can figure what tire fits good on a wheel but i dont know how far i can go either way.Basically what i want to do is go with a 17x9 wheel all the way around with my widebody.I would like to know if it sounds reasonable to go 275-40-17 in the rear and 245-45-17 in the front using 17x11's on all four corners?Flame me if needed i just cant find things:flamedevi Quote Link to comment Share on other sites More sharing options...
2126 Posted May 11, 2007 Share Posted May 11, 2007 I think that some of the tire distributor websites have just what your looking for....maybe try the TIRE RACK site. Tom Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted May 12, 2007 Share Posted May 12, 2007 I usually just do this: L = [(S/25.4)-(W+1)]/2 L is the length of the buldge over the edge of the rim lip in inches. S is the tire section width in mm (ie. 275mm) W is the width of the rim in inches (ie. 9") L would be up to -.5" for a super stretched look, +.75 for a large buldge. I think around .2-.4" is a optimal, but it depends who you ask. So for your 17X11: Front - L = [(245/25.4)-(11+1)]/2 L = -1.177" That is way too small imho. That means on either side the tire will be in 1.1" doubt the tires would even mount. Rear - L = [(275/25.4)-(11+1)]/2 L = -.59" Still a little small imho... might work. Would be pretty stretched. You need something like: .3 = [(x/25.4)-(11+1)]/2 so a 315-325mm would be nice on 11" rims. Thats my 2 cents. Someone correct me if I am wrong. Quote Link to comment Share on other sites More sharing options...
Airjockie Posted May 12, 2007 Share Posted May 12, 2007 http://www.rims-n-tires.com/rt_specs.jsp Quote Link to comment Share on other sites More sharing options...
JMortensen Posted May 12, 2007 Share Posted May 12, 2007 I usually just do this: L = [(S/25.4)-(W+1)]/2 L is the length of the buldge over the edge of the rim lip in inches. S is the tire section width in mm (ie. 275mm) W is the width of the rim in inches (ie. 9") L would be up to -.5" for a super stretched look, +.75 for a large buldge. I think around .2-.4" is a optimal, but it depends who you ask. So for your 17X11: Front - L = [(245/25.4)-(11+1)]/2 L = -1.177" That is way too small imho. That means on either side the tire will be in 1.1" doubt the tires would even mount. Rear - L = [(275/25.4)-(11+1)]/2 L = -.59" Still a little small imho... might work. Would be pretty stretched. You need something like: .3 = [(x/25.4)-(11+1)]/2 so a 315-325mm would be nice on 11" rims. Thats my 2 cents. Someone correct me if I am wrong. Interesting formula. My experience is that the rim width should be approximately the same as the section width. Running your formula for a 225 on an 8" rim gives -.07 and that does not fit your .2 to .4 ideal, but I think that's what you'll find 90% of the autoxers and roadracers will use on an 8" rim. Other "correct" tire sizes also arrive outside of your .2 to .4 suggestion: 7" should use a 205 in my experience, but = .03 with the formula 9" should use a 245 or 255, but = -.17 or .019 with the formula I think the formula works, I guess for my money I'd try to get the answer as close to 0 as possible. A 305 on an 11 = .003, but I'm not sure that they make 305s, usually its 295s or 315's it seems. In that case I'd probably opt for the 295s. Quote Link to comment Share on other sites More sharing options...
G.I.jonas Posted May 12, 2007 Author Share Posted May 12, 2007 Sorry guys,i just realized my post is a bit confusing lol.I said 17x9 at first and then 17x11 later.17x9 on all 4 corners is what im shooting for,possibly the 11's on the rear. Quote Link to comment Share on other sites More sharing options...
rudypoochris Posted May 13, 2007 Share Posted May 13, 2007 Yes, .2-.4 might be a little bulbous. Close to 0 is a good size too. Depends really I would think on how you like your setup. I would think anything under -.4" in or over .4" would be less than ideal. It also depends alot on what series tires you are running. If you have a higher profile a little more or less doesn't hurt, lower profile would have less tolerance in either direction. Quote Link to comment Share on other sites More sharing options...
SteelToad Posted May 13, 2007 Share Posted May 13, 2007 http://www.miata.net/garage/tirecalc.html or http://ejelta.com/tiresize/index.html?ws17=1&ws16=1&ws15=1&tiresize=195/70-14&minwidth=&maxwidth=&minratio=&maxratio=&minwheel=&maxwheel=&maxdelta=2&orderby=delta Quote Link to comment Share on other sites More sharing options...
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