Rear tire..
Thread Starter
Junior Member
Joined: Jul 2011
Posts: 6
Likes: 0
Car: 87' Formula
Engine: 355
Transmission: 700R4
Axle/Gears: 3.73
Rear tire..
I'm trying to find out what I need to do to fit a 12.5" tire on the backside of my 87' Formula. Any suggestions on backspacing and mods would be helpful.
Supreme Member
iTrader: (5)
Joined: Mar 2011
Posts: 2,893
Likes: 4
From: Central Texas
Car: GTA
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: Aussie 9-bolt/3.27 posi
Re: Rear tire..
To start with....Do you have a 3rd gen or 4th gen rear end?
2ndly, do you have/want 3rd or 4th gen backspacing wheels?
3rdly, you can cut off the rear bumpstop from the body, beat the inner panel in in the middle & cut a little from the front & rear.
12.5" under the fenders & without totally cutting out the inner fenderwell & modding the interior is almost a tall order. Would have to figure everything PERFECT to not have to touch the interior.
EDIT: You said tire, not wheel. In that case, not nearly as hard to do, just still have to figure it right, but I dunno tires near as well as wheels.
2ndly, do you have/want 3rd or 4th gen backspacing wheels?
3rdly, you can cut off the rear bumpstop from the body, beat the inner panel in in the middle & cut a little from the front & rear.
12.5" under the fenders & without totally cutting out the inner fenderwell & modding the interior is almost a tall order. Would have to figure everything PERFECT to not have to touch the interior.
EDIT: You said tire, not wheel. In that case, not nearly as hard to do, just still have to figure it right, but I dunno tires near as well as wheels.
Thread Starter
Junior Member
Joined: Jul 2011
Posts: 6
Likes: 0
Car: 87' Formula
Engine: 355
Transmission: 700R4
Axle/Gears: 3.73
Re: Rear tire..
I have a 3rd gen rear end and looking for 3rd gen backspacing. I probably won't go with any larger than an 11" wheel and I'm looking to fit a 305-315 tire. I'm tossed up between Rally II's or Snowflakes from Year One in 17" or 18"
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