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Thread: How To Calculate Tire Size

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Posts: 1-6 of 6
2007-12-19 22:48:35
#1
How To Calculate Tire Size
2 x width x side wall / 2540 + rim size = Tire dia.


205/40/17

2 x 205 x 40 / 2540 + 17 = 23.45


91-94 SER tire 185/60/14

2 x 185 x 60 / 2540 + 14 = 22.74


91-93 NX2000 195/55/14

2 x 195 x 55 / 2540 + 14 = 22.44


95-98 200sx SER 195/55/15

2 x 195 x 55 / 2540 + 15 = 23.44
2007-12-20 00:43:34
#2
Cool, this is calculator is pretty handy too:

http://www.miata.net/garage/tirecalc.html
2007-12-20 00:47:04
#3
Boo for the easy way, we need to use our brains. Good link though
2007-12-21 06:38:04
#4
ZOMG i'm actually speeding on the highway, hmm maybe i should slow down
2010-01-09 22:20:28
#5
This is very useful;

Tire size calculator
2010-01-09 22:58:02
#6
There is also a formula located in the SR20 Gearstack Worksheet in this section

Just in case anyone has a brain dump, I added it in so you could see how changing your overall tire diameter will change your RPM/MPH ratio.

My example is this: ((205)(.55)/25.4)(2)+15= 23.87 on the worksheet. To find the tire circumfrence, obviously take 23.87 and multiply by Pi.

Dre's way is faster though
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