Tire and Rim opinion

[Endangered Species]

Since I can't get a 4.30 gear. I may have to change tires.
Right now I'm running Phoenix 29.5x10.5-15with 10" Rims

Has anyone run 31X10.5 - 15's with 10" Rims? Phoenix recommends 12"

The section width goes from 13.0 to 14.7

Or I could put a 4.11 gear in the car and use a 28" tall tire.

 

[33 IMP]

Are you sure you are not looking at 31x10.5W ? (NOT meant as an insult, that kind of section increase implies a W to me)
That said, ive never used either size, but if it really has a 10.5 tread, i wouldn't worry a second about a ten inch rim. The tread would be flatter on a twelve, however.
Edit; this IS only an opinion, but thats what you asked for, lol.

 

[Endangered Species]

Sorry, you are correct...it's a 10.5 W and the tread width goes from 10.7 to 11.7.

Thanks

 

[33 IMP]

Mickey makes a 10.5x33, if you have the room for that height . But that "10.5" has 11.2 tread on the ground. 4.56s?

 

[Endangered Species]

You know... I don't think the 33's will fit, but I see they have a 31 10.5W... I ran the math and with the 4.56 I have now, it will put me at 6875 RPM at the traps which is close enough to my target which is 6800. lol

I wonder why Mickey's recommend 10" rims and Phoenix recommends 12"....

You may have pointed me in the right direction, Thanks 33!

 

[Budnicks]

let me see if I still got this right

IIRC

the narrower wheel will just affect the sidewalls/cross sections
might give it a tad bit more rollout/taller, lil' less contact patch (? if any)
lil' bit less air/psi, will compensate
& cross-section mainly, the contact patch won't be affected much
using a 10" wheel/rim vs a 12" wheel/rim

we use to go with the wider wheel/rim to calm down a tire
not wrinkle so much, sort of rides on the outer portions of the tire more too
usually can handle a lil' more psi too

 

[33 IMP]

Seems right to me, Budnicks.
The really fast guys using the "big" small tire drag radial pro, are using a 14" rim with a 315 tire. (Somewhere near 11" on the ground). I think it gives a better contact patch, with less "bow" in the tire with the amount of air pressure they want to run. I have some 315 dr pro's, but on 12" (dont make anywhere near enough power for 14s) and i want to a-b test them against my hoosier quick time pros that are on my 14s.

 

[khryslerkid]

Since I can't get a 4.30 gear. I may have to change tires.

Just posted this in your other thread. Contact Cass, Dr. Diff and see what he says.
https://quartermax.com/amp/dana-60-...-nitro-9310-pro-ring-pinion-drag-racing-only/

 

[383man]

I run 4.30's in my 8-3/4 rear and use Hoosier 30 x 9 radial slicks. Course my 63 is a street car that I race in full street mode through the full exh. I drive the highway like this turning about 3000 rpm at 60 mph. But I like the 4.30's with a 30" tall tire as my car weighs 3700 lbs without me in it and has run 10.70's. I honestly think it may go faster with 4.10's as I shift around 6200 and trap about 6400. And my eng is a mild 493. It feels like it almost peaking at the traps so that why I think it may pick up a little dropping the gear a tad. But I would have no problem running 4.10's with a 28" tire or even 3.91's. Good luck what ever you decide. Ron

 

[Endangered Species]

Thanks guys!
I did end up finding a US Gear 4.30 Pro gear at Drive Train Specialties. They had a couple left... I debated weather to get it or not since I'm going to go with the 31x10.5 tires... I decided to grab it while the getting was good. If I don't use it, then I'll just sell it.
Service was super good with them except they did bang me $45.00 to ship a 18lb package from Indiana to the Pennsylvania - Ohio boarder.

 

[dvw]

My 10.5Wx31 M/T's have been on 10" rims since day one. Last time out it went 1.261 60ft.
Doug

 

[6PKRTSE]

I run 10.5W's and 315's D.R.'s on 12" wheels. It definitely helps stretch the width.

 

[Endangered Species]

Right no guys... Thanks!!

I'm going to go with the Mikey's 31x10.5's.
I'm jus going to have to use some spacers to get the clearance I need for now until I get new rims with the off set I need.
If I get new rims, I'm may still end up with 10" rims because the old school rims I want don't seem to come in 12".