[HWYSTR455]

Originally Posted by hojs69

Here are 315 / 35 x 17 rear tires on one of my sons.

Yes, with proper backspacing it is possible to get 315s in a 17, or even an 18. In general, it requires an 11" wide wheel.

It gets tight in there, and most would be more comfortable rolling the lips. The more narrow a wheel is, the more the sidewall bulges, and a side load can make it contact the lip (not good at speed, will slice the sidewall). And more bulge allows the tire to roll more side to side.

There is only so much space between the leaf and the lip, so even if you narrow the rear you are still limited.

If you do strip launches, and make it soft (shocks & springs) for weight transfer, you have the same issue as with side load. Lower tire psi and the transfer will make the tire bulge more. When that happens is debatable, but you can't deny it won't.

And raising the car has it's drawbacks too, as already mentioned. It a fine line to walk.


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[HWYSTR455]

Nice car by the way, solid roof car too.


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[kingbuzzo]

looks sharp tho...trade offs galore

[thepontiacman]

My friend with the 75 TA said a pic of his car is on the Robmcperformance website under custrides.

Cool!

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[R 70 Judge]

Originally Posted by R 70 Judge

Just so you know, a 15x10 with 5.5” backspacing fits as well. I’ll try to get a picture of how these look on my car. They are Billet Specialties Single Bead Lock Win Lites. 15x10 5.5” BS rear with MT 275/60/15 ET Street R Radials.

The fronts are 15x4 1.625” BS. I did some research and the 15x4 2.25” BS sucks the wheel too far into the wheel well for my liking. I even spoke to tech at Billet Specialties and they said the same and recommended the 1.625” BS.

Just a heads up for anyone considering the Billet Specialties Win Lite wheels… My rear Aerospace Components pro-street discs do not fit inside the Win Lite wheels. They hit the caliper. Billet Specialties race wheels have a smaller inner barrel than most race wheels. They require a brake system with smaller than a 13.150” internal diameter.

I will be swapping out the rear brakes with an Aerospace Components pro-street low profile kit.
https://shop.aerospacecomponents.com...3-1-1-2-2.aspx

Figured I’d share my experience

[R 70 Judge]

Originally Posted by R 70 Judge

Great info here

It’s surprising how big of a tire you can cram into a f-body. This is a 30x12.5 ET Street biasply tire.

I pulled the Weld drag lites and measured the backspace. They appear to be a 15x8 4.5” BS. I also discovered the inner part of the 30x12.5 MT tire was rubbing against the tailpipes. If you are thinking of trying this tire size you may want to consider something a little smaller.

[thepontiacman]

New wheels and tires.

Top 30 of 300 at show.

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[kingbuzzo]

Looks sharp

[Skip Fix]

My TA has M/T DOTs 275-60-15 on ProStars 4.5 BS. They fit on a 8" "snowflake" that is about 4.5 BS also

[VCho455]

Here's more information from the PT crowd.

https://www.pro-touring.com/threads/...irebird+wheels