Tire sizing help, please?
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Drifting
Joined: Jan 2003
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From: I got you a puppy!
Tire sizing help, please?
I'm replacing tires on my jeep wrangler, and cannot figure out what size to order. I currently have BFG 33x12.5 sr15. I would like to replace with Bridgestone Dueler A/T revo. in about a 32x10.5. Tire sizes are in metric (Example: 265/70 sr15) How do I convert this? I know the first number is width, so I would need about a "265", but the second number is aspect ratio. How can I calculate the diameter? Thanks!
Drifting
Joined: Nov 2002
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From: Ontario
Pro
Joined: Jan 2003
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From: Baton Rouge LA
Originally Posted by zzyzx
Thanks! Do I use mm for all values?
For metric conversion:
Tire mm width / 25.4 x aspect ratio x 2 + wheel diameter = total tire diameter.
ex. 275/40/17
275 / 25.4 x .40 x 2 + 17 = 25.66"
Hope this helps...
Instructor
Joined: Jul 2004
Posts: 106
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From: Brandon Mississippi
Originally Posted by zzyzx
I'm replacing tires on my jeep wrangler, and cannot figure out what size to order. I currently have BFG 33x12.5 sr15. I would like to replace with Bridgestone Dueler A/T revo. in about a 32x10.5. Tire sizes are in metric (Example: 265/70 sr15) How do I convert this? I know the first number is width, so I would need about a "265", but the second number is aspect ratio. How can I calculate the diameter? Thanks!
don't know about all that math-stuff...hey.... that why I teach agriculture(
)
