Guest iskone Posted March 3, 2004 Share Posted March 3, 2004 My freind has a set of 16 x 7's with +32mm of offset and 205/45/16's I did the math and unless I'm wrong they have 4.13" of backspacing. What I want to know is anyone is running this size wheel with 245/45/16's My Car is lowered and besides that it is all stock. The tires are 9.6" on a 8" wide rim. I don't know how much it's been lowered but my frame rails are about 3 1/2" to 3 1/4" off the ground (It's hard to get an accuracte measurment but I'll give it another shot) I think 225/55or50/16 would fit, my tire chart says they would be 9.2" on a 7" wide wheel. The 50's would only be about .5" taller but the 55's would be about 1.5" taller. 225/45/16's would be 8.9" on a 7.5" wheel but I don't know how much of a difference the .5" rim width would effect the width of the tire. Thanks Quote Link to comment Share on other sites More sharing options...
Guest ON3GO Posted March 3, 2004 Share Posted March 3, 2004 245's on a 7in rim is abit to wide.. a 235 will fit but i dont think the 245 will fit on the wheel. mike Quote Link to comment Share on other sites More sharing options...
Guest iskone Posted March 3, 2004 Share Posted March 3, 2004 I've been talking to the guys a Discoount tire and I think I'll go with 225/50/16's they look they'll fit. Installed they measure 9.2" by 24.9". If I am wrong about this let me know Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted March 4, 2004 Share Posted March 4, 2004 With +32mm offset your backspacing (on 7" wide wheels - which are actually 8" - 1/2" for each bead) would be 5.13". 4" would be the backspacing for 0 offset. Quote Link to comment Share on other sites More sharing options...
Guest iskone Posted March 4, 2004 Share Posted March 4, 2004 Here I was thinking I was all savy. I might be figuring backspaceing wrong becuase even with an 8" rim I don't get 5.13", I get 4.63". Here's how 32mm = 1.25984" 1.25984" + 8" = 9.25984" 9.25984" / 2 = 4.62992" 4.63" of backspacing. How did you get 5.13"? 4" with 0 offset? But the tires have 32mm of offset, am I missing somthing? Quote Link to comment Share on other sites More sharing options...
BayAreaZT Posted March 4, 2004 Share Posted March 4, 2004 Backspace is the distance from the inboard rim edge to the mounting surface. For a 8" wide rim, 0 offset would be 4" backspace. A 8" wide rim with 32mm offset would be 4" + 1.26" = 5.26" backspace. You don't divide the offset by 2. Quote Link to comment Share on other sites More sharing options...
Guest iskone Posted March 4, 2004 Share Posted March 4, 2004 Taht makes sense, and after taking another look at the formula I was doing my math wrong. So are these 16 x 7's with +32mm gonna fit? Right noe the wheels have 205/45/16 tires on them. Quote Link to comment Share on other sites More sharing options...
Brad-ManQ45 Posted March 5, 2004 Share Posted March 5, 2004 Actually, for a 7" rim with 0 offset ypu would have 4" backspace. You have to add ~1" to the advertised rim width to get the total width... I/m not good w/fractions, so forgive me for the ~/.13" difference. Quote Link to comment Share on other sites More sharing options...
Guest iskone Posted March 5, 2004 Share Posted March 5, 2004 My freind brought one of the wheels to work today so I am just going to bolt it on and see what happens. Quote Link to comment Share on other sites More sharing options...
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