I know there is a way to figure out the hieght of a tire. I had it at one time, now I have lost it. I need this to see what kind of slicks to get.

 

Take the tire width in millimeters, say 235. Multiply it by the aspect ratio, say .45 (dont forget the decimal), that's the sidewall height in mm. Now divide that # by 25.4 to convert to inches. Take 2 times that # and add the rim diameter and you should get the overall diameter. The 235/45/17 should be 25.33 in dia.

 

What you do is take the tread width and divide it by 25.4. This will give you the width in inches, next take that number and multiply it by the aspect ratio of the sidewall. Then you add the diameter of the rim to get the results. For example my tires are 195/60-15s. So I take 195/25.4 = 7.677", now I take 7.677 x 1.2 (0.60 x 2) and I get 9.21". Then I add the 15" rim and my OD (outer diameter) equals 24.21 inches. However this is assuming the tire is a perfect circle. When I actually measured the diameter (vertically) it was 23.25". Your best bet is to measure the diameter of your wheels vertically (top of tire to the bottom of it). And find a shorter rim+tire combo that fits above your brakes. If I can make a suggestion some stock 15" wheels with BFG drag radials in 205/50-15s would give the best results for the strip. This would in effect give you a final gear of 4.00 vs 3.62 stock.

 

Thanks guys: I have two 15 and 16 inck stock rims available now. I just dont know if I will be able to hook up with 205dr. And it realy sux *** that nobody makes like a 215/40/16 dr or somthing like that. I might end up getting 22x8 slicks and put them on my 15 inch rims. BUT i dont know about running slicks just yet.

 

Go with the lightest and smallest setup you can. Try for the 15's. 8" sounds kinda wide for what you'll be doing, and will likely just add mass for you to accelerate all the way down the quarter.