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10 1/2 Tire on 8 1/2 Rim #208627
01/30/09 01:28 PM
01/30/09 01:28 PM
Joined: May 2007
Posts: 47
North Branch, MI, USA
notchbackcuda Offline OP
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notchbackcuda  Offline OP
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Posts: 47
North Branch, MI, USA
I'm not sure where to ask this: I'm contemplating running MT 10 1/2 X 31 ET DRAG tires on 8 1/2 Centerlines. With this combination I can get the tire I want under the car (73 Charger) without modifications other than a Doctor Diff Spring Offset. Otherwise, It's tubs or mini-tubs. What kind of trouble am I asking for running a narrower than recommended rim?

Thanks

Re: 10 1/2 Tire on 8 1/2 Rim [Re: notchbackcuda] #208628
01/30/09 01:39 PM
01/30/09 01:39 PM
Joined: Aug 2008
Posts: 4,075
Mo.
racerx Offline
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Quote:

I'm not sure where to ask this: I'm contemplating running MT 10 1/2 X 31 ET DRAG tires on 8 1/2 Centerlines. With this combination I can get the tire I want under the car (73 Charger) without modifications other than a Doctor Diff Spring Offset. Otherwise, It's tubs or mini-tubs. What kind of trouble am I asking for running a narrower than recommended rim?

Thanks


Less of a contact patch

Re: 10 1/2 Tire on 8 1/2 Rim [Re: racerx] #208629
01/30/09 01:41 PM
01/30/09 01:41 PM
Joined: Feb 2005
Posts: 2,528
Mansfield, Tx
Jacob Pitt Offline
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It won't hurt it. It will be a little narrower and the sidewall will become a little more stiff but it will work fine. I have run a 31*13 on a 10" wheel for years.


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Re: 10 1/2 Tire on 8 1/2 Rim [Re: Jacob Pitt] #208630
01/30/09 03:18 PM
01/30/09 03:18 PM
Joined: Jan 2003
Posts: 17,923
Akron, Ohio
ProSport Offline
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ProSport  Offline
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Akron, Ohio
How fast are you going? Car will definitely be more stable on a wider rim. I'm running 10" rims with a 10.5 tire and some run 12" rims.


1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
Re: 10 1/2 Tire on 8 1/2 Rim [Re: ProSport] #208631
01/30/09 04:41 PM
01/30/09 04:41 PM
Joined: Jun 2005
Posts: 483
Michigan
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BigFish69 Offline
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Michigan
No problem done that for years

Re: 10 1/2 Tire on 8 1/2 Rim [Re: notchbackcuda] #208632
01/30/09 04:50 PM
01/30/09 04:50 PM
Joined: Oct 2004
Posts: 8,165
Left Coast
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BobR Offline
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M/T recommends using a wheel no less than 1" narrower than the tire for a reason. We use a 16" wheels with a 10.5W tire. Some guys do it but it's not right. If I were you I would get a 9" slick.

Re: 10 1/2 Tire on 8 1/2 Rim [Re: notchbackcuda] #208633
01/30/09 05:37 PM
01/30/09 05:37 PM
Joined: Jan 2003
Posts: 13,382
Marion, South Carolina [><]
an8sec70cuda Offline
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Run it, you won't have any trouble. I've done it for years, have many friends doing it on some fast stuff, never any trouble. CHIP


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
Re: 10 1/2 Tire on 8 1/2 Rim [Re: notchbackcuda] #208634
01/30/09 05:47 PM
01/30/09 05:47 PM
Joined: Aug 2003
Posts: 43,274
Bend,OR USA
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Cab_Burge Offline
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Bend,OR USA
If your running the 10.5x31x15 W tire you need a wider rim like Bobr has said, if it is a non W tire you will probally fight getting the best contact patch with the 8 inch wide rim versus a 10 inch. I have ran the smaller M/T 26x10 and 29x10.5 wide tires on 8.5 inch wide rims and that work fine as far as I could tell, I never swapped those size tires onto a 10 inch or wider rim and ran them with the rim change only so I did change rims sizes on my old NHRA A/SA stocker with 9x30x15 slicks from a 8 inch wide rim to a 10 inch wide rim, that car like that a lot Different animal tho so we can't really compare your car to mine back then

Last edited by Cab_Burge; 01/31/09 02:48 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: 10 1/2 Tire on 8 1/2 Rim [Re: an8sec70cuda] #208635
01/31/09 01:11 AM
01/31/09 01:11 AM
Joined: Oct 2004
Posts: 8,165
Left Coast
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BobR Offline
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Quote:

Run it, you won't have any trouble. I've done it for years, have many friends doing it on some fast stuff, never any trouble. CHIP




WHY?

Re: 10 1/2 Tire on 8 1/2 Rim [Re: BobR] #208636
01/31/09 07:11 AM
01/31/09 07:11 AM
Joined: Feb 2005
Posts: 2,528
Mansfield, Tx
Jacob Pitt Offline
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Jacob Pitt  Offline
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Mansfield, Tx
Quote:

Quote:

Run it, you won't have any trouble. I've done it for years, have many friends doing it on some fast stuff, never any trouble. CHIP




WHY?




Sometimes these isn't enough room for a 12" wheel.


2013 NHRA D4 Stock Champ
#4 in the World IHRA Stock
2x IHRA Div.4 Stock Champ
14x Track Champ
All using a Ultimate Converter Concepts converter. Call Lenny today 704-892-6837
Re: 10 1/2 Tire on 8 1/2 Rim [Re: notchbackcuda] #208637
01/31/09 10:02 AM
01/31/09 10:02 AM
Joined: Jan 2003
Posts: 16,929
NC
440Jim Offline
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440Jim  Offline
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NC
I would recommend at least a 10" rim, but the 8.5" rim will be just OK.

The narrow rim will hurt the contact patch, result in needing lower tire pressures and less tire life (both tread and side wall life), and less traction. Especially the taller 10.5 tires (31-33) really work well on wider rims (10-14); especially the W tires. But of course that will make the section width of the tire wider...


1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1






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