wheel and tire combos
Thread Starter
4th Gear
Joined: Feb 2012
Posts: 4
Likes: 0
wheel and tire combos
I would like to use 15 x 10 rims with a 3 3/4 backspace torque thrust II design on my 73 will there be any fitment issues, specifically front rubbing during steering? All steering and suspension front and back is stock.
Last edited by Harry F. Miller; Feb 16, 2012 at 11:26 AM. Reason: better info
Race Director
Joined: May 2006
Posts: 18,755
Likes: 2,589
Doesnt the tire size effect this also, what size tire? You are pushing the wheel in towards the car frame 3/4", stock 8" wheel is 4" backspace. So if the tire width is larger than the rim width, usually it is, you need more than an additional inch of clearance compared to the stock rim/tire. In the back there is a good chance of hitting the parking brake cable at the very least, in the front hitting the sway bar or other suspension components.
Thread Starter
4th Gear
Joined: Feb 2012
Posts: 4
Likes: 0
tire size
Doesnt the tire size effect this also, what size tire? You are pushing the wheel in towards the car frame 3/4", stock 8" wheel is 4" backspace. So if the tire width is larger than the rim width, usually it is, you need more than an additional inch of clearance compared to the stock rim/tire. In the back there is a good chance of hitting the parking brake cable at the very least, in the front hitting the sway bar or other suspension components.
Last edited by Harry F. Miller; Feb 16, 2012 at 12:46 PM. Reason: adding info
Thread Starter
4th Gear
Joined: Feb 2012
Posts: 4
Likes: 0
On your 69 the rims are also 15x8's? they look wider must be as you say the tire size equals extra width, they definatelly look good on your car
Thread Starter
4th Gear
Joined: Feb 2012
Posts: 4
Likes: 0
sorry for multiple posts, new on this forum, the wheels on my car are 15x8 with 4'' back space. P215/70R15's. your wheels look wider due to tire size,being the same size rim as mine, maybe 15x8 torque II's would be the way to go and resolve all fitting issues, your's look plenty wide enough. thanks
Race Director
Joined: Jan 2007
Posts: 14,974
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From: NYC NY
Better idea. The stock wheels are 8" wide with 4" of backspace. A 10" wheel with 3.75" backspace will not fit inside the fender wells. GM put 255/60-15s on 15x8s starting in '78 but they trimmed the front edge of the fender and the rear corner of the fender in the front to avoid any interference issues. So if you choose that size tire you could have some rubbing which may crack the fender. You could drop down to a 235/60 or maybe even a 245/60 to eliminate any rubbing issues but those sizes will not be as tall as the stock 27" height tires. I hope this answers more questions than it asks. 
Instructor
Joined: Dec 2009
Posts: 195
Likes: 0
From: Chesterfield Virginia
Better idea. The stock wheels are 8" wide with 4" of backspace. A 10" wheel with 3.75" backspace will not fit inside the fender wells. GM put 255/60-15s on 15x8s starting in '78 but they trimmed the front edge of the fender and the rear corner of the fender in the front to avoid any interference issues. So if you choose that size tire you could have some rubbing which may crack the fender. You could drop down to a 235/60 or maybe even a 245/60 to eliminate any rubbing issues but those sizes will not be as tall as the stock 27" height tires. I hope this answers more questions than it asks. 
I'm running T70Rs 15x8 w/ 4'' backspace. 255/60/15 in the rear and 235/60/15 up front.
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Racer
Joined: Jul 2007
Posts: 460
Likes: 56
From: Southeast Ohio
I have 15x10 Torque Thrust D with 3 3/4 in. backspacing and N50's on the back of my car. I did have to use a 1/4 in. spacer to clear the caliper. They stick out about 2 in. I like that look, some don't.
From the sound of your post, you also want these on the front.
I think someone on here built a replica race car with 15x10's all around, but I'm sure he used fender flares all around. Maybe he'll chime in.
From the sound of your post, you also want these on the front.
I think someone on here built a replica race car with 15x10's all around, but I'm sure he used fender flares all around. Maybe he'll chime in.
