Impala SS427.com Message Board

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RearTire sizes

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=trq427' width='330' height='300' border=0 style='border:none;'> on 7/27/2019, 9:33 pm

Hoping to get input as to a rear wheel/tire combination on a 69 B body. Is it possible to use a 275-60X15 rear tire on a 8.5 inch wheel,,with 3.75 backspacing? Thanks

Re: RearTire sizes

Posted by Nick <iframe src='https://members5.boardhost.com/impalass427/info/user=427impalasportcoupe' width='330' height='300' border=0 style='border:none;'> on 8/1/2019, 11:03 am, in reply to "RearTire sizes"

I put an adjustable panhard bar on My 69 SS427. You can center the rear, so the tires don't hit. Also a rear sway bar helps, keeping the rear from dropping down when a bumper jack is used. NICK L72

427impalasportcoupe

Re: RearTire sizes

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=trq427' width='330' height='300' border=0 style='border:none;'> on 8/1/2019, 8:26 pm, in reply to "Re: RearTire sizes"

Thanks Nick. I have an adjustable panhard bar,and the car has the original F41 rear sway set up. I'm wanting a set of Vintage silver 15 x 8 Torque Thrust D wheels with a 4 to 4.5 backspacing,but I dont think they make that backspacing anymore. All I've been able to locate on American racing site is 15 X 8.5 with 3.75 back spacing,,I fear those will rub on the wheelhouse lip. Open to any suggestion though,and thanks to you, Nick, and the others who have provided info to this question. Not sure what I'm gonna do.

Re: RearTire sizes

Posted by CTK1968 <iframe src='https://members5.boardhost.com/impalass427/info/user=CTK1968' width='330' height='300' border=0 style='border:none;'> on 8/2/2019, 6:18 am, in reply to "Re: RearTire sizes"

https://www.summitracing.com/parts/are-vn10558061/overview/

Re: RearTire sizes

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=trq427' width='330' height='300' border=0 style='border:none;'> on 8/2/2019, 6:15 pm, in reply to "Re: RearTire sizes"

Thanks,,,,these are 105's,,grey color centers. I'm hoping to find 309's,,silver centers.How did you research these?? Thanks

Re: RearTire sizes

Tim,
I wanted the straight spoke TTOs but they didn’t have the size I wanted for the rear so I bought the Torque Thrust Ds. I have thought about painting the centers with cast aluminum paint or just sand blasting the centers.
Chad

Re: RearTire sizes

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=trq427' width='330' height='300' border=0 style='border:none;'> on 8/3/2019, 8:38 am, in reply to "Re: RearTire sizes"

Thanks Chad,,I guess it's the 105's or nothing. Thanks for the info and sharing your research. What tires,brand wise,did you end up using? And you went with 15 X 6 on the front,,correct?

Re: RearTire sizes

Posted by CTK1968 <iframe src='https://members5.boardhost.com/impalass427/info/user=CTK1968' width='330' height='300' border=0 style='border:none;'> on 8/3/2019, 6:15 pm, in reply to "Re: RearTire sizes"

Tim,
I have 15X7 wheels on front with 225/70/15 tires. I have BFG Radial TA tires.
Chad

Re: RearTire sizes

Posted by Glenn <iframe src='https://members5.boardhost.com/impalass427/info/user=427+Block+Head' width='330' height='300' border=0 style='border:none;'> on 7/31/2019, 5:40 pm, in reply to "RearTire sizes"

I recall that Bill Stull posted on this site once that he had 295x15x50 tires on his car without any problems with rubbing ... he hasn't posted on here for a long time but if someone can post his contact details he should be a great help ... Cheers Glenn

Re: RearTire sizes

Posted by Sluggo <iframe src='https://members5.boardhost.com/impalass427/info/user=sluggo' width='330' height='300' border=0 style='border:none;'> on 7/29/2019, 8:08 am, in reply to "RearTire sizes"

A 275/60 is about as big as you can use in a 15 inch tire. However, your backspace is questionable as it pushes the tire towards the fender. Center the tire on the hub
using a 4- 4-1/2 backspace.

Re: RearTire sizes

275-60-R15 is a big tire with 8.5 inch wheels. They could rub the inner fender. Adjust Your panhard bar to center the wheels. I used air shocks or load leveler shocks with springs to raise the back. 255 is a better size. The 69 B body has less clearence than a 68 wheel well. Of course if You already ordered the tires try them. NICK L72

427impalasportcoupe

Re: RearTire sizes

Posted by CTK1968 <iframe src='https://members5.boardhost.com/impalass427/info/user=CTK1968' width='330' height='300' border=0 style='border:none;'> on 7/29/2019, 9:30 am, in reply to "Re: RearTire sizes"

I have 15" X 8" Torque Thrust D wheels with 4 1/2" backspacing and 275/60/15 tires on the rear of my '68. They fit great with no clearance issues.
Chad

Re: RearTire sizes

Posted by TRQ <iframe src='https://members5.boardhost.com/impalass427/info/user=trq427' width='330' height='300' border=0 style='border:none;'> on 7/29/2019, 7:40 pm, in reply to "Re: RearTire sizes"

Thanks Chad. Let me ask this,,some 8.5 Torque Thrusts are 3.88 back spacing. Do you see this as an issue clearance wise in your opinion? Thanks

Re: RearTire sizes

Posted by CTK1968 <iframe src='https://members5.boardhost.com/impalass427/info/user=CTK1968' width='330' height='300' border=0 style='border:none;'> on 7/30/2019, 11:32 am, in reply to "Re: RearTire sizes"

Tim,
I think that would push the tire out too far to fit inside the quarters, at least on a '68.
Chad

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