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Rear end dilemma ... #3053172
06/24/22 10:43 PM
06/24/22 10:43 PM
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Ontario, Canada
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Stanton Offline OP
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Ok ... '69 Road Runner. Mini tubbed 2" (not all the way to the frame rail). Springs moved inboard.

With the stock width 8-3/4 I could fit a 10" wide wheel with a 5-1/2" backspace into the well with about 1/4" or so clearance to the inner tub. The tire in use is a M/T with a 13.1" section

With the wider tubs I plan to use a 12" wheel with a tire with a 15" section.
Its now time to order a new rear end and I have a few options ...

1) Order a stock width rear end and use a wheel with a 7-1/2" backspace
2) Order a 1" per side narrower rear end and use a wheel with 6-1/2" backspace
3) Order a 2" per side narrower rear end and use a wheel with 5-1/2" backspace

So there's my dilemma ...what to order. Thoughts ??

Re: Rear end dilemma ... [Re: Stanton] #3053176
06/24/22 11:09 PM
06/24/22 11:09 PM
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If you have a choice I would go with less backspacing. It saves some weight if nothing else.


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Re: Rear end dilemma ... [Re: Stanton] #3053177
06/24/22 11:19 PM
06/24/22 11:19 PM
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Narrower rear end is lighter and stronger. On the other hand a centered wheel is probably the strongest and least flexible.


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Re: Rear end dilemma ... [Re: Stanton] #3053190
06/25/22 01:22 AM
06/25/22 01:22 AM
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Bend,OR USA
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The deeper the offset the easier they are to remove, usually twocents work:: up:

Last edited by Cab_Burge; 06/25/22 01:23 AM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Rear end dilemma ... [Re: Cab_Burge] #3053218
06/25/22 08:46 AM
06/25/22 08:46 AM
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I'm wondering if that much back space is actually available.

Re: Rear end dilemma ... [Re: Sniper] #3053270
06/25/22 01:08 PM
06/25/22 01:08 PM
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My race car had a set of Monoque that were 15 inches wide with 3.0 offset from the back side up
I have two other sets of drag race wheels, a set of Centerline 15 inch wide with 5.5 offset and a set of Welds 13.5 with 4.0 offset.
I think Weld offers offsets in half inch increments and Centerline use to only offer 3 1/8 and 5 1/4 inch offset regardless of the wheel widths, I think: work:

Last edited by Cab_Burge; 06/25/22 01:09 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Rear end dilemma ... [Re: Cab_Burge] #3053281
06/25/22 01:42 PM
06/25/22 01:42 PM
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Originally Posted by Cab_Burge
My race car had a set of Monoque that were 15 inches wide with 3.0 offset from the back side up
I have two other sets of drag race wheels, a set of Centerline 15 inch wide with 5.5 offset and a set of Welds 13.5 with 4.0 offset.
I think Weld offers offsets in half inch increments and Centerline use to only offer 3 1/8 and 5 1/4 inch offset regardless of the wheel widths, I think: work:


7 1/2 inches? on a 10" rim?

Re: Rear end dilemma ... [Re: Sniper] #3053295
06/25/22 02:44 PM
06/25/22 02:44 PM
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1/4" of tire clearance to the wheel tub? Seems like that would rub when cornering?

Re: Rear end dilemma ... [Re: Neil] #3053317
06/25/22 05:01 PM
06/25/22 05:01 PM
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I'd find the rims you like, then that makes the rear end choice for you.
You may change rims over the life of the car, so pick something common/standard
Only want to buy the rear end once........

Re: Rear end dilemma ... [Re: BDW] #3053352
06/25/22 08:01 PM
06/25/22 08:01 PM
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Ontario, Canada
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Stanton Offline OP
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Quote
7 1/2 inches? on a 10" rim?


Not uncommon on later vehicles - Mustangs in particular.

Re: Rear end dilemma ... [Re: Sniper] #3053401
06/26/22 02:21 AM
06/26/22 02:21 AM
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GomangoCuda Offline
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Originally Posted by Sniper
Originally Posted by Cab_Burge
My race car had a set of Monoque that were 15 inches wide with 3.0 offset from the back side up
I have two other sets of drag race wheels, a set of Centerline 15 inch wide with 5.5 offset and a set of Welds 13.5 with 4.0 offset.
I think Weld offers offsets in half inch increments and Centerline use to only offer 3 1/8 and 5 1/4 inch offset regardless of the wheel widths, I think: work:


7 1/2 inches? on a 10" rim?



The original poster was talking about 12" wheels.


In theory, there is no difference between theory and practice. In practice, there is.
Re: Rear end dilemma ... [Re: BDW] #3053728
06/27/22 08:16 AM
06/27/22 08:16 AM
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Marion, South Carolina [><]
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Originally Posted by BDW
I'd find the rims you like, then that makes th
e rear end choice for you.
You may change rims over the life of the car, so pick something common/standard
Only want to buy the rear end once........

iagree Otherwise you might have to order custom offset wheels from somewhere like Holeshot. Not a bad thing, but expensive. twocents


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Re: Rear end dilemma ... [Re: Sniper] #3053793
06/27/22 12:38 PM
06/27/22 12:38 PM
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Bend,OR USA
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Originally Posted by Sniper
Originally Posted by Cab_Burge
My race car had a set of Monoque that were 15 inches wide with 3.0 offset from the back side up
I have two other sets of drag race wheels, a set of Centerline 15 inch wide with 5.5 offset and a set of Welds 13.5 with 4.0 offset.
I think Weld offers offsets in half inch increments and Centerline use to only offer 3 1/8 and 5 1/4 inch offset regardless of the wheel widths, I think: work:


7 1/2 inches? on a 10" rim?

shruggy


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)






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