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post #1 of 3 Old 07-15-2020, 07:57 PM Thread Starter
Flundertaker
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1986 CJ7 
 
Join Date: Mar 2020
Posts: 25
Wheel Fitment

86 CJ7 with 2.5" RE lift otherwise stock. Currently wearing factory 15x7 rims with 31x10.5x15 MTRs. Opportunity to pick up a set of 15x10 wheels with 3" backspacing. Couple questions

1. For the time being can I run my same tires on these new wheels? Would go to 12.50 once these wear out
2. Will 3" backspacing create any fitment issues with my current tires or 12.50's in the future?

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post #2 of 3 Old 07-15-2020, 09:02 PM
BagusJeep
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Location: Bali
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Your rims are at the narrowest for your MT tyres (BFG recommended 7" to 9"), they work, 15x8 would work better and is what most of us with stockish CJs run. The new 15x10 rims would technically be too large for the 31x10.5x15 but you could run them for a while, rubber is flexible. If you put 12.5" tyres on (say 33x12.5x15) the new rims would work fine.

I think the backspacing stock is 3.5". This by itself is not the problem. You have two things to consider / adjust for:

Wheelarches / flares - you will stick out more about 3" with the 12.5" wide tyres. Your State may mandate the tyres are entirely within the bodywork. Anyway you need to consider if you will flick up stones on to other road users.

Steering Stops - If your stops are already adjusted, you will not hav ea proble. However when you move up in tyre size they will need adjusting to avoid rubbing on full lock.

And your 2.5" lift is not enough for 33" tyres.

my only regret with my J20 is that the rims have too little offset and the 33x12.5x15 stick out too far. Due to the big brake discs and heavy duty Bendix calipers the PO put these on, really they need a 16.5" rim and more backspacing to go over the calipers. I also need a wider rim. Waiting for money!!!!
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1981 CJ7 258ci - Bagusjeep
1984 CJ7 258ci - Puthijeep
1981 J20 258ci - Gladys
1951 Willys CJ3A/MB/M38 - Little Willy
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post #3 of 3 Old 07-15-2020, 09:09 PM Thread Starter
Flundertaker
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1986 CJ7 
 
Join Date: Mar 2020
Posts: 25
Quote:
Originally Posted by BagusJeep View Post
Your rims are at the narrowest for your MT tyres (BFG recommended 7" to 9"), they work, 15x8 would work better and is what most of us with stockish CJs run. The new 15x10 rims would technically be too large for the 31x10.5x15 but you could run them for a while, rubber is flexible. If you put 12.5" tyres on (say 33x12.5x15) the new rims would work fine.

I think the backspacing stock is 3.5". This by itself is not the problem. You have two things to consider / adjust for:

Wheelarches / flares - you will stick out more about 3" with the 12.5" wide tyres. Your State may mandate the tyres are entirely within the bodywork. Anyway you need to consider if you will flick up stones on to other road users.

Steering Stops - If your stops are already adjusted, you will not hav ea proble. However when you move up in tyre size they will need adjusting to avoid rubbing on full lock.

my only regret with my J20 is that the rims have too little offset and the 33x12.5x15 stick out too far. Due to caliper size the PO put these on, really they need a 16.5" rim and more backspacing to go over the calipers. I also need a wider rim. Waiting for money!!!!

Thank you sir.
No issues here with tire coverage. Lots of jacked up pick ups running 8-10 of tire outboard of the flare. Looks like crap but not illegal. Not sure about my stops. I can check them and adjust as needed.
Super looking J20 BTW.


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