Tire Preferences

Rick Rockett · Jun 23, 2019

New RR owner here. Pretty new to MOPARs. My newly acquired '69 has very old tires that I want to replace. Goodyear Eagle GTII's... 235/60R-15 in front (26.1" tall) & 255/60R-15 rear (27.0" tall).

I like the look & the stance, but I'm considering putting 275/60R-15 on the rear to add an extra 1" (28"tall). Is anyone running that setup? Any photos?
My only concern would be whether that might give me too much height in the rear &/or make the fronts look small (or otherwise end up with an odd look).
Comments/opinions??

Russ69Runner · Jun 23, 2019

I chose to put 2 and half inch recurve spring's on this runner. We use to use air shocks and push them pretty high up in the rear. So the tire would not scrub the in side fender at the top. Figured we had problems with the old air shocks blowing out and we use to get truck springs to put under our cars to raise them up. The car looks good as is but a little more rise on the rear and shell look bad ass.

RKNRLR · Jun 27, 2019

Rick Rockett said:
New RR owner here. Pretty new to MOPARs. My newly acquired '69 has very old tires that I want to replace. Goodyear Eagle GTII's... 235/60R-15 in front (26.1" tall) & 255/60R-15 rear (27.0" tall).
View attachment 28031
I like the look & the stance, but I'm considering putting 275/60R-15 on the rear to add an extra 1" (28"tall). Is anyone running that setup? Any photos?
My only concern would be whether that might give me too much height in the rear &/or make the fronts look small (or otherwise end up with an odd look).
Comments/opinions??

Im running the 275 60/s in the rear with the 235's up front and they look rad

Rich B · Jun 27, 2019

Rick Rockett said:
New RR owner here. Pretty new to MOPARs. My newly acquired '69 has very old tires that I want to replace. Goodyear Eagle GTII's... 235/60R-15 in front (26.1" tall) & 255/60R-15 rear (27.0" tall).
View attachment 28031
I like the look & the stance, but I'm considering putting 275/60R-15 on the rear to add an extra 1" (28"tall). Is anyone running that setup? Any photos?
My only concern would be whether that might give me too much height in the rear &/or make the fronts look small (or otherwise end up with an odd look).
Comments/opinions??

Strange to read about 15” wheels with the 18” and 19” rims these days. Car has just the right stance I’d say also. Of coarse wider on back and a bit taller wouldn’t hurt either. If on a launch weight can be transferred to rear for traction, that’s what is wanted. Um, it’s like shifting the cars stance so pressure is actually applied to rear tires for first several seconds. Not a drag expert by any means but can understand the fundamentals of that. Traction bars are a good addition with leaf springs, keeps them stable from too much twist and look awesome. Didn’t have them on my road runner but did on my ‘Lil Red Express Truck.

Smaller tires will turn up faster for sure but if too extreme in height or width back end will bounce around/over on corners, bumpy roads with the before struts era. Oh too your door seams are perfect, Chrysler insignia on pass. side rocker panel only and right side wheels are reverse threaded so lug nuts don’t spin off; not a bad idea. Try to figure that one out when your a kid lol.

Russ69Runner · Jun 27, 2019

Yes if I was going to drag race my car would have traction bars on it. Those in the picture are way to fancy we use to make our own. Cool picture of them. Brings back memory's of our racing day's. :thumbsup:

Rick Rockett · Jun 27, 2019

RKNRLR said:
Im running the 275 60/s in the rear with the 235's up front and they look rad

Wow, I'd like to see that. Can you post some pics? A good profile side-view would be great!
Thanks!

ACME A12 · Jun 28, 2019

Generally speaking traction bars are not needed on a MoPar because the axle is not positioned in the center of the spring like on a Ford or GM product. It is forward of this point. This shorter front spring segment makes it stiffer and it therefore functions like its own traction bar. If traction is a problem then additional clamping on the front segment of the spring and/or the addition of an adjustable pinion snubber is usually all that is required to rectify any traction issues. The Chrysler Engineers knew what they were doing. Leave the slapper bars to the brand X cars...

Steve · Jun 28, 2019

Rick Rocket,here's a pic of mine with 275/60 15 and 235/60 15.

ACME A12 · Jun 28, 2019

Steve said:
Rick Rocket,here's a pic of mine with 275/60 15 and 235/60 15.

That's not your car. You just grabbed that pic off of the internet. Everyone knows that your car has the factory shiny hood stripes...
:rofl:

69hemibeep · Jun 28, 2019

ACME A12 said:
Generally speaking traction bars are not needed on a MoPar because the axle is not positioned in the center of the spring like on a Ford or GM product. It is forward of this point. This shorter front spring segment makes it stiffer and it therefore functions like its own traction bar. If traction is a problem then additional clamping on the front segment of the spring and/or the addition of an adjustable pinion snubber is usually all that is required to rectify any traction issues. The Chrysler Engineers knew what they were doing. Leave the slapper bars to the brand X cars...

Agreed on the traction bars and snubber. All the big name racers in the 60s and 70s ran the snubber

Rick Rockett · Jun 28, 2019

Steve said:
Rick Rocket,here's a pic of mine with 275/60 15 and 235/60 15.
View attachment 28060

That looks great! I'm looking for that extra height in the rear. Looks like you've raised the suspension some as well? You've got more clearance from the top of your rear rims to the fender lip than what I have (see my pic on first post here). Are you running different springs or air shocks?

Russ69Runner · Jun 28, 2019

ACME A12 said:
Generally speaking traction bars are not needed on a MoPar because the axle is not positioned in the center of the spring like on a Ford or GM product. It is forward of this point. This shorter front spring segment makes it stiffer and it therefore functions like its own traction bar. If traction is a problem then additional clamping on the front segment of the spring and/or the addition of an adjustable pinion snubber is usually all that is required to rectify any traction issues. The Chrysler Engineers knew what they were doing. Leave the slapper bars to the brand X cars...

A couple of 50 LB bags of cement in the trunk will also help.

Steve · Jun 29, 2019

ACME A12 said:
That's not your car. You just grabbed that pic off of the internet. Everyone knows that your car has the factory shiny hood stripes...

LMAO..I knew someone would comment on that.Rick,rear suspension is as it left the factory.

Rick Rockett · Jun 29, 2019

Steve said:
Rick,rear suspension is as it left the factory.

Wow, it looks higher than stock. Not just your taller tire/wheel combo, but the actual height from top of rim to fender lip.

Russ69Runner · Jun 29, 2019

You can get a little more lift with taller shackle on the rear of spring. But we had problem's with them wanting to bend. So made some out of half inch plate steel. You do a lot of things when drag racing than on just a driver car. Think Classic sell some a little longer.

ykf7b0 · Jun 29, 2019

275/60 15 rear and 195/70 15 front

ally bank california

Rick Rockett · Jun 29, 2019

That looks great! Thanks for the photo.
I’d like to get just another inch or so between my rear rims & the fender lip.
I guess I would need longer spring shackles or recurved springs.

69hemibeep · Jun 30, 2019

If its the look you are after that's cool but the more you lift the more traction you loose.

Rick Rockett · Jun 30, 2019

69hemibeep said:
If its the look you are after that's cool but the more you lift the more traction you loose.

Good point.

BioMedTechGuy · Jul 2, 2019

I bought the staggered set of Year One aluminum Rallye wheels, 8" front, 9" rear.
The only tires the rear 9s have worn are 315/35/17 Toyo Proxes TQ drag radials. My suspension is totally stock.
The tires never rub, perfectly centered, are almost 11" wide treadwidth, fine in the rain, great for traction....
And look KILLER!

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