max tyre size on rim

Submitted: Sunday, Apr 25, 2004 at 19:50
ThreadID: 12364 Views:5008 Replies:4 FollowUps:1
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Hi everyone,

Just wondering if anyone knew what the maximum safe tyre size/width was for a 7 inch wide rim. 31x10.5 seem to be no problems but is 33x12.5 stretching it? Or is it more of a case of 'yes it will fit, but there increased chance of rolling off the rim at low psi'?

Cheers,
Dave.
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Reply By: Leroy - Sunday, Apr 25, 2004 at 20:20

Sunday, Apr 25, 2004 at 20:20
An 8" rim is the minimum for a 33". You will find the tyre manufactures don't recommend anything smaller. Just before I posted I checked the BFG site and they say 8.5" rim! But I think you'll get away with 8".

Leroy
AnswerID: 55898

Reply By: Phil G - Sunday, Apr 25, 2004 at 20:23

Sunday, Apr 25, 2004 at 20:23
You can look up the tyre/rim size info on the tyre manufacturers websites. BFGoodrich for instance specifies 7to9 inch wide rims for the 31x10.5R15, and 8.5 to 11 inch wide rims for the 33x12.5R15. So if you stick to the 7 inch wide rims then you have limited choice.

If a tyre is too small for a rim, then rolling it off may be more likely; if a tyre is too wide for a rim, then it will wear in the middle and may not handle too well. Stick to what the tyre manufactuer recommends.
AnswerID: 55900

Reply By: Truckster (Vic) - Sunday, Apr 25, 2004 at 20:30

Sunday, Apr 25, 2004 at 20:30
It all depends on the manufacturer of the tire as to what size rim they recommend.

12.5's on a 7in rim is askin for issues.

I have Simex 11.5's on an 8inch rims they fit perfect.

10.5s will fit well on an 7inch rim, but again depends on brand.

most states going to 33x12.5's requires an engineers certificate done on the car.
AnswerID: 55905

Reply By: Rosco - Bris. - Monday, Apr 26, 2004 at 08:26

Monday, Apr 26, 2004 at 08:26
If it's a 16" rim, 235/85 are the biggest you can legally fit on 7"
AnswerID: 55953

Follow Up By: Leroy - Monday, Apr 26, 2004 at 09:47

Monday, Apr 26, 2004 at 09:47
and that's around a 32" tyre.

Leroy
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FollowupID: 317833

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