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Author Topic:   ROLLOUT
ryan
Dirt Freak

Total posts: 430
posted June 11, 2002 11:59 AM
Does anyone know the rollout of a 235/70/15. I would like to know before I would buy any

racer17j
Dirt Forum Champ
Total posts: 1565
posted June 11, 2002 12:12 PM UIN: 54865418
take a tape with you we do that with all the tires we buy because they can very alot even with the same size tire but a rough estimate i would say in the upper 80's lower 90's

smayo964
Dirt Forum Racer

Total posts: 90
posted June 11, 2002 01:13 PM
Ryan. If you know the brand of your tires, you can go to their web site and view their specifications. They will list you the OD of the tire. All you have to do is multiply it by 3.1416 (PI) to get the circumference (rollout). For ex.- On a Goodyear Eagle GS, the OD of your 235/70-15 is 27.9". That multiplied by (PI) 3.1416 is 87 5/8" rollout. Hope that helps.

Blackgold
Dirt Roller

Total posts: 13
posted June 11, 2002 11:13 PM
I have used the following formula for some time now, and while it is not exact, it will usually be within 1/2 inch. You divide the tire width by 25.4 and multiply that by .70 for 70 series tire. Then take that times 2 for the tire on top snd bottom of rim and add 15 for rim diameter. A 235/70/15 would figure: 235 divided by 25.4=9.25X .70=6.48 This X 2 =12.95 plus 15 inch rim diameter=27.95 inch diameter tire X 3.1416=87.93 roll. most of my 235s measure 87.5 to 87.75 dependng on wear and brand. This seems to be in the ballpark for most tires. Rim width could possibly cause some variance also. For 60 series tires use .60 in place of the .70. Ed

ryan
Dirt Freak

Total posts: 430
posted June 12, 2002 12:10 AM
THANKS!

ryan
Dirt Freak

Total posts: 430
posted June 12, 2002 12:44 AM
I tried to find it but I can't. I thought I read somewhere for 1" of rollout equals 100 rpm is that correct? Thanks again.

bib 1
Dirt Newbie

Total posts: 3
posted July 22, 2002 10:25 PM
about 87-87.5 is right, depending on brand. iused to run retreads, 235- 70 series on rr and 235-60 series on lr, gave me about 1.5 to 2 inches of stagger.

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