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How to measure rim width when tire installed

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Old Nov 20, 2014 | 12:03 PM
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Default How to measure rim width when tire installed

I need to measure a rims width which is fitted with a tire. I know I need to measure from bead seat area to bead seat area. Has anyone done this?

I found a rim width, tire width tool on at northern tool but not certain it will do the job.

Need to know rim width to determine if I can run narrower tire in front as current tire is closer to fender lip than I prefer. The wheels are Kinesis Super Cup wheels, currently running 18 x30 x 285.in rear and 18 x 40 x235 in front.

My stock wheels and tires are 996 Twin Turbo hollow spoke wheels which run 18 x 30 x 295. in rear and 18 x 40 x 225 , in front, all size info is cast into these wheels. They fit perfectly. Rims are 8" front and rears are 11"

photo of tool in link

http://www.garagejournal.com/forum/a...1&d=1416493829
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Old Nov 20, 2014 | 12:42 PM
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If you're presently running 235's in the front and they're not stretched, you'd be more than fine with a 225/40-18 in the front. No need to buy tool. You can fit most 225/40-18's on rims from 7.5"-9" width.
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Old Nov 20, 2014 | 12:52 PM
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Ideally I'd like to run wheels with same specs as TT wheels and have same offsets as tt wheels : 50 in front and45 in rear. They fit right and I like the way they look.
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Old Nov 20, 2014 | 01:19 PM
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Think you're more running into an offset issue, than what a minor, minor variation in tire width will solve. (Not to mention why you want less contact patch up front.)

In any case, ~$20 spent at a tire shop for a quick dismount/remount will get you the definitive answer.
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Old Nov 20, 2014 | 03:22 PM
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[QUOTE=race911;11817886]Think you're more running into an offset issue, than what a minor, minor variation in tire width will solve. (Not to mention why you want less contact patch up front.)

Yes I do need check offset. twin turbo wheel are 50 front and 45 rear They to my eye fit and look nice.

I saw in another thread where someone had 8" and 10" Kinesis supercup rims and was saying front offset was 42 and rear was 30.
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Old Nov 20, 2014 | 03:51 PM
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Originally Posted by Ron
I need to measure a rims width which is fitted with a tire. I know I need to measure from bead seat area to bead seat area. Has anyone done this?

I found a rim width, tire width tool on at northern tool but not certain it will do the job.

Need to know rim width to determine if I can run narrower tire in front as current tire is closer to fender lip than I prefer. The wheels are Kinesis Super Cup wheels, currently running 18 x30 x 285.in rear and 18 x 40 x235 in front.

My stock wheels and tires are 996 Twin Turbo hollow spoke wheels which run 18 x 30 x 295. in rear and 18 x 40 x 225 , in front, all size info is cast into these wheels. They fit perfectly. Rims are 8" front and rears are 11"

photo of tool in link

http://www.garagejournal.com/forum/a...1&d=1416493829
Kinesis wheels all have .5" flanges so they will measure 1" more in overall width than in bead width.

It's easy enough to measure overall width w/ tires mounted, just place a rigid board across the wheel flange on each side(make sure it rests on the wheel flange not the tire) and then measure the perpendicular distance between them
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