Re: 69 Roadrunner Rim & Slick size??
[Re: Mopar.70]
#3039359
05/03/22 12:56 PM
05/03/22 12:56 PM
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Joined: Apr 2005
Posts: 1,505 TN
SCATPACK 1
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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Question for the OP. Are the springs in the stock location, or did you move them inboard closer to the frame?
Old Geezer Racing
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Re: 69 Roadrunner Rim & Slick size??
[Re: Mopar.70]
#3039373
05/03/22 01:20 PM
05/03/22 01:20 PM
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Joined: Apr 2005
Posts: 1,505 TN
SCATPACK 1
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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I am no help on the rim selection, But we ran 10.50/29 on the rear of my Brothers 68 RR with stock spring location. I can't remember if he had centered 10 inch wheels or if they were slightly offset.
Old Geezer Racing
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Re: 69 Roadrunner Rim & Slick size??
[Re: Mopar.70]
#3039415
05/03/22 02:57 PM
05/03/22 02:57 PM
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Joined: Jan 2003
Posts: 13,400 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,400
Marion, South Carolina [><]
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If the car has had new 1/4 panels installed, then you need to measure carefully. Aftermarket 1/4s have thicker lips on the wheel openings that don't get trimmed down to factory width a lot of times. There is more room w/ factory 1/4 panels.
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
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Re: 69 Roadrunner Rim & Slick size??
[Re: Mopar.70]
#3039417
05/03/22 03:19 PM
05/03/22 03:19 PM
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Joined: Jan 2003
Posts: 17,912 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
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Posts: 17,912
S.E. Michigan
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8" wheel, 4.5 backspace with a 12" section width tire, 29.3 tall, is about it from my limited perspective.
69 gtx, stock width dana 60, SS springs, and newly replaced quarters/wheelhouses/AMD parts. I would start somewhere in that ballpark on most cars.
On mine, 5.5 backspace would put the sidewall of the tire into the leaf spring, and 5" would be shaky/don't ever turn. 10" with 4.5 backspace would put the sidewall of the tire into the outer wheelhouse.
There is a skosh of extra space that could be utilized on the outside by using an 8.5 or 9" wheel instead of 8", but those width dimensions have both proved to be harder to find than 8".
Rich H.
Esse Quam Videri
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Re: 69 Roadrunner Rim & Slick size??
[Re: ZIPPY]
#3039440
05/03/22 05:35 PM
05/03/22 05:35 PM
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Joined: Mar 2009
Posts: 2,475 Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,475
Sydney,Australia
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68 Satellite . rolled lip . Stock spring location . Factory XHD springs . Standard width diff . 8"rim use a 4 1/2 BS 10"rim use a 5 1/2"BS I have run 295/65R15 @ 30.3/3"tall but slight rub on dogleg . I shimmed spring back 1/4"to make it all fit with no rub . I run a radial PBR 29.5x10.5R15 , actual height is 30"
Tex
Last edited by tex013; 05/03/22 05:35 PM.
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: 69 Roadrunner Rim & Slick size??
[Re: ZIPPY]
#3039443
05/03/22 05:40 PM
05/03/22 05:40 PM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Our '69RR, Dana, 8" wide torque thrusts 4.5" backspace, caltracs stock location10x29 Hoosier but the Dana was narrowed about 1", could get a 10.5 tyre on there at a push
Last edited by rb446; 05/03/22 05:41 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: 69 Roadrunner Rim & Slick size??
[Re: Mopar.70]
#3039552
05/04/22 12:27 AM
05/04/22 12:27 AM
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Joined: Dec 2021
Posts: 1,182 Loudoun County, VA
Brad_Haak
super stock
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super stock
Joined: Dec 2021
Posts: 1,182
Loudoun County, VA
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An 8" wheel is better suited to a 9" slick than a 10", because the narrow wheel pulls in the sidewalls enough that the larger tire bows in the center. A 9" will give a better footprint and you can usually run a little more pressure that improves the high speed stability. At least, that's been my experience. YMMV
2021 Challenger 6.4L Scat Pack 1320 100% stock: 1.680, 11.894 at 113.75 (DA 175 ft) weight reduction, wheels, tires, Hellcat air box: 1.661, 11.686 at 115.97 (DA 710 ft)
1973 Challenger 452 ci street/strip [2008] pump gas, DOT radials: 1.454, 10.523 at 126.44 (DA 514 ft)
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Re: 69 Roadrunner Rim & Slick size??
[Re: Brad_Haak]
#3039568
05/04/22 05:13 AM
05/04/22 05:13 AM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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I would go along with that, the widest wheel you can, 9-10" on a 10" slick if poss. By the way we run 17psi on our Hoosiers, works well but still killing the tyre some (big torque motor), almost radial tyre pressures.
Last edited by rb446; 05/04/22 06:42 AM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: 69 Roadrunner Rim & Slick size??
[Re: racerx]
#3039577
05/04/22 07:18 AM
05/04/22 07:18 AM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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That is not the norm for that size bias tyre but we don't do norm, I made that mistake in 1990 running 4psi on a 14x32 slick cos thats what everyone else ran, pushed it up to 6psi and it broke the Tach off the dash on the hit.....its what worked best for our 3800lb combo at Santa Pod, 1 more psi and it turned the tyre. My mate's 3150lb Dart 60'd best with 13psi on a 13x31 tyre, run as much as you can so you don't kill the tyre.
Last edited by rb446; 05/04/22 07:24 AM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: 69 Roadrunner Rim & Slick size??
[Re: Mopar.70]
#3039591
05/04/22 08:16 AM
05/04/22 08:16 AM
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Joined: Jan 2003
Posts: 13,400 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,400
Marion, South Carolina [><]
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I have 15x8" rims w/ 4.5" of BS and a 295-65 drag radial...very close to a 29.5x10.5 slick. I also have another pair of rims that are 15x8.5" w/ 5" of BS that have 29.5x10.5 slicks on them. Both sets fit the '69 RR w/ factory 1/4 panels, but neither will fit the '69 RR that had new 1/4s put on. They hit at the top outside edge and the front edge. The body shop that installed the 1/4 panels neglected to trim them back like the factory ones. Didn't notice it until after the paint work was all done. A 28x10.5" or 275-60 fits great on it though.
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
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Re: 69 Roadrunner Rim & Slick size??
[Re: an8sec70cuda]
#3039632
05/04/22 10:35 AM
05/04/22 10:35 AM
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Joined: Jan 2003
Posts: 2,937 A shed in England
Tig
master
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master
Joined: Jan 2003
Posts: 2,937
A shed in England
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Apologies for going off topic. In my experience I've found that Caltracs will need more pressure in the tyre by design. A lot of the faster guys use a radial or a stiff sidewall, especially in a heavier car. Our Challenger would kill the sidewalls in a bias ply way before the "tread" was gone. A buddy tried some of our old slicks in his 10 second '55 Chevy, I did warn him, he made 2 passes and parked the car
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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