Topic: ATTN: C3s w/ Torque Thrust II Wheels
in Forum: C3 Driveline Components
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Lifetime MemberHOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
Hi team,
Looking to figure out the correct backspacing and tire size in going to a 16" TT II, equivalent sizing to the factory 15" rims with 255/60-15 tires.
Please let me know what combination worked on yours. If you have the part # for the rims, even better!!
Thanks
Paul
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Lifetime MemberModerator
Moses Lake, WA - USA
Joined: 4/16/2005
Posts: 2134
Vette(s): 1976 L48 4-spd, Mahogany Metalic exterior, Buckskin interior 350ci/350hp, 3rd owner, fiberglass spring, 255/50-16's Torq-Thrust II
Hi Paul
I am running 255/50-16's TT 2's and have a very slight rub on the right front tire when turning right. I am not at home right now so can't say for sure on back spacing. Will check tonight. I did order them from Tire Rack mounted and balanced.
Paul, I've got 17X8 TT2's and 255/50-17's. I too have some rubbing only on left hand turns. I've got 3 3/4" backspacing on my wheels, which seems fine. You can check the data sheets on various tires on Tire Rack.com and see what the tire height would be on different sizes. That's what I did when I got mine.
Sounds like if you want the 16's, Glen's setup is close to what you'll want. Good luck.
Larry
The difference between men and boys is the cost of their toys!!
Lifetime MemberModerator
Moses Lake, WA - USA
Joined: 4/16/2005
Posts: 2134
Vette(s): 1976 L48 4-spd, Mahogany Metalic exterior, Buckskin interior 350ci/350hp, 3rd owner, fiberglass spring, 255/50-16's Torq-Thrust II
Hey Paul
According Tire Rack it is -11mm offset
suncountry 2008-01-21 18:49:16
They look great by the way
I forgot to add the rubbing is between the tire and frame rail. I don't hear it or feel it, just I can see a small shinney spot when I pulled the wheel off.
Lifetime MemberHOWELL, NJ - USA
Joined: 5/18/2004
Posts: 6812
Vette(s): 1979, Targa Blue (72 Color), Pace Car rear spoiler, L88 hood, Dark blue factory interior, 525HP 406, HD 700R4, 370 gears,Steeroids, composite rear spring, TT IIs wrapped in T/A Radials.
Thanks loads guys! Looks like the 11MM offset is what I need.
Glen, does the tire hit the frame toward the front or the back of the wheel well?
Thanks again!
Paul
LukesVette Homepage
Veteran of Operation Iraqi Freedom
101st Airborne(AirAssault!)
God Bless America
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Lifetime MemberModerator
Moses Lake, WA - USA
Joined: 4/16/2005
Posts: 2134
Vette(s): 1976 L48 4-spd, Mahogany Metalic exterior, Buckskin interior 350ci/350hp, 3rd owner, fiberglass spring, 255/50-16's Torq-Thrust II
Its the back of the wheel well right on the frame
The 16" wheels I bought for "The Toy" had +55mm offset (6.614" backspacing) so I had to get spacers custom made to get them centered correctly. The tires are 235/60-16 BFG TAs. According to the specs I found on TireRack they were the closest to the F70-15 original size.
The only time there is a rub is when its at full right lock and I hit a bump - very slight rub on the back of the left front fender lip. Here's a picture taken at BG in 2004 where you can see the paint rubbed away.
Jim Olson 
"The Toys"...!!! Save the Wave! 
THE 255 ARE DEFINATELY TO BIG FOR THE FRONT. i HAD A SLIGHT RUBBING MYSELF.
The easiest place for this is check out the tirerack.com. They have a calculator for this. I bought my T2s went to 16s also and its perfect.
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Mounds View, MN - USA
Joined: 5/24/2007
Posts: 1031
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
Original ralley wheels are 15 x 8, and have four inch backspacing. So obviously any aftermarket 8" wheel would be correctly centered with the same 4" backspacing. For every inch wider, add a half inch of backspacing.
The comments from the guys with 3 3/4 " and a slight rub seem to prove the point.
You can't go wrong with those wheels!
The comments from the guys with 3 3/4 " and a slight rub seem to prove the point.
You can't go wrong with those wheels!
in Forum: C3 Driveline Components
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