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Old 04-09-2002, 12:12 PM   #1
Slammed67
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Talking Tire size conversion chart

I posted this in another thread, but thought I'd put it in a new post in case everyone didn't see it:

"Here is a sample of a tire chart size conversion chart I made up. I got the idea from a fellow board member, Tom who made a similar chart. It basicaly converts the metric (mm) units to inches. It gives the sidewall height and overall diameter. You just type in your wheel diameter and it lists all the dimensions of different tire combinations (some probably don't even exist). It came in pretty handy when I was choosing my tires sizes. If you are interested, let me know, and I'll e-mail it to you. Oh, it's an Excel spreadsheet by the way."



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Current project: The "HACKstoration" 1967 GMC shortbed/fleetside, 350/700R4, air bag suspension, 18" billet wheels. Other vehicle of interest: 1957 Chevy Bel-Air 4dr hard top, 283/powerglide, lowered 3-1/2" in front and 2 inches in the rear.

Web Site: jaySpot.com AOL Screen Name: Slammed67GMC Location: Kansas City, MO

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Current project: The "HACKstoration" 1967 GMC shortbed/fleetside, 350/700R4, air bag suspension, 18" billet wheels. Other vehicle of interest: 1957 Chevy Bel-Air 4dr hard top, 283/powerglide, lowered 3-1/2" in front and 2 inches in the rear.

Web Site: jaySpot.com AOL Screen Name: Slammed67GMC Location: Kansas City, MO


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Jason - '67 GMC swb | '57 Bel-Air 4dr hardtop | '56 210 4dr Wagon | 2000 GMC Sierra
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Old 04-09-2002, 02:10 PM   #2
67 cst swb
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Location: Rapid City, SD
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OR...
P-size X series X 2 (# of sidewalls)= ?
then...
? divided by 25.4 = ? --> + rim diameter=

Example
P235/75R15

235 X .75 X 2 = 352.5

352.5 divided by 25.4 = 13.87

13.87 + 15" rim = 28.87 inches tall
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the P size is millemeter of rubber width rim bead to rim bead going up sidewall accross tread and down sidewall...
the Series is the Percentage of sidewall. so a 75 series is taller than a 50 series
the first ? is in metric form
you then convert to SAE by dividing by 25.4 for 25.4 mm in 1 inch.
from there you have total rubber height... because you already multipied X 2...
just add your rim diameter...
Hope that helps.....in case you lose the chart... Bryan in So.Dak

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Bryan in South Dakota
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-67 CST originally a 327-4bbl(missing)...w/TH400 w/AC,PS,PB,3pc bucket seat,small window,LWB. orig. drk blue w/blue interior. needs serious restoration
-67 CST(plain janer) 283/MT LWB
-2000 Silverado 1/2ton 2wd x-cab w/4th door
***future projects***
A 67/68 CST,SWB,350/TH350,Lowered 5/7, rollin' on 17's, not air bagged.using above listed 67 CST (janer)

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My Trucks:
1967 Chevrolet Short Wide Box 327 TH350 9" w/3.90 gears paint will be White - Current Project
1967 Chevrolet Custom LWB 283 TH400 3.73 Posi, no-AC, no-PS, no-PB, bench-seat, small-window - mostly orig driver
1967 Chevrolet CST LWB originally a 327 TH400 3.73 Posi AC PS PB, had Buddy Buckets, Small Window - parts truck
1967 Chevrolet CST LWB, 283 MT 3.73 had Buddy Buckets, Panoramic Window - parts truck
2001 Chevrolet 3500 2WD Crew Cab Dually 8.1L Allison White
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