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Slick Cross Section Wider Than Spec

padam

padam

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Hoosier 29.0/10.0-15 bias ply slicks.
Mounted on 10" wide wheels.
IMG_20210530_101910559.jpg
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Section width measures 13", the catalog spec is 11.8.

I got these used, and they look like balloons when I mounted them. They hit the spring by about 3/8".
I don't have much in them, but I'm concerned that if I buy new ones they will also be wider than spec.
Is there any other reason they are so wide?
 
I've got a hoosier 10x28 bias slick on an eight inch rim. Section width is 11 1/4-11 3/8.
If you have room to the outside, and three inch studs, I'd just throw on a 1/2" spacer. (Billet, not that cast crap).
 
I DO NOT mean to insult, but are you sure they arent "w"s? What is the tread width? Tread looks wider than the wheels.
Edit: my 10" hoosiers on 8" rims show 9 3/4 tread, probably lucky to get 9" to the ground. My 10.5 mickeys on 8.5" show exactly 10.5 tread, put 9 1/2 on the ground.
 
Last edited:
Tread width on these is 10.25". There is no "W" on the tire size marking.

I have run MT 28x10.5-15 slicks on this car before, with 15x10 rims and 5.0 backspace, and I don't remember it being a real close fit.

These rims have a 5.5 backspace, but if the tire was exactly 11.9 CS, it should fit.

I guess it is probably what HEMI-ITIS said, wider rims than what is listed in the catalog.
 
Rims fit under the car and have tires there is so much to the engineering back space rotational torque contact area heck just weight remember its all fun.
 
33 IMP said:
I DO NOT mean to insult, but are you sure they arent "w"s? What is the tread width? Tread looks wider than the wheels.
Edit: my 10" hoosiers on 8" rims show 9 3/4 tread, probably lucky to get 9" to the ground. My 10.5 mickeys on 8.5" show exactly 10.5 tread, put 9 1/2 on the ground.
Click to expand...
more like 8 when they spin up or less.
 
440 Charger said:
more like 8 when they spin up or less.
Click to expand...
I was just referring to the fact that tread contact gets a little light on the edges, with a rim on the narrow side compared with tread width.
Heck, ive got some 16"tread tires squeezed onto 12" rims. The wear pattern is gonna be interesting.
 
For some reason I've had it in my head for 30 years that you needed 10" wide rims for 10" slicks.
Of course the last time I bought them, mfg info wasn't as easy to come by. (Not much Internet.)
 
padam said:
For some reason I've had it in my head for 30 years that you needed 10" wide rims for 10" slicks.
Of course the last time I bought them, mfg info wasn't as easy to come by. (Not much Internet.)
Click to expand...
Agree, that would be ideal, imo. Though i hear that the really fast guys running the 275 drag radial classes are running that just under 10" tread tires on 12, and even 14" beadlock rims. Ive got a pair of the 315 pro's on 12s,(recommended 8.5-11"rim) but they arent beadlocks.
 
33 IMP said:
Agree, that would be ideal, imo. Though i hear that the really fast guys running the 275 drag radial classes are running that just under 10" tread tires on 12, and even 14" beadlock rims. Ive got a pair of the 315 pro's on 12s,(recommended 8.5-11"rim) but they arent beadlocks.
Click to expand...
Yeah my 29.5x 11.5 recommended 10" rims. I'll be running them on 12.5's didn't increase the section width any but did flatten out the sidewall and is giving a better contact patch. With 10"rims the edges were always rounded up.
 
Hoosiers chart specifies the measuring rim as 8". And the section width as 11.9. Adding 1" to the minimum rim size adds roughly 1/2" in section width. If the measuring rim was 8" this would make the section 12.9" on a 10" rim.
Doug
 
The numbering used on tire sizing is for a static tire. No load on it.
A road race tire and a drag race tire can be the same sizing but the tires will change shapes differently under loads.
Depends on how the tire carcass is designed/constructed. Sizing doesn't tell you that. Only static dimensions.
 
dvw said:
Hoosiers chart specifies the measuring rim as 8". And the section width as 11.9. Adding 1" to the minimum rim size adds roughly 1/2" in section width. If the measuring rim was 8" this would make the section 12.9" on a 10" rim.
Doug
Click to expand...

Doug I haven't ran into that. All I ever ran into with wider rims is the bead is pushed out making the sidewall flatter and less rounded. This also helps flatten the tread(contact patch). My section width is still the same 14" with the 12.5 vs 10".

Maybe that has to do with the Phoenix tires I run. Mine do have a fairly wide section width to tread.
 
That info comes from M/T.
Doug
 
dvw said:
That info comes from M/T.
Doug
Click to expand...
Good to know. I plan on running some MT PBR 29.50 x 10.50-15 on the Cuda if it widens the section width that would be good. Thanks for th additional info.
 
How does a tire not increase section width with a wider rim? My experiance is exactly what Doug posted.
 
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