Chris Alston Subframe and Front Wheel Size

[Redduck]

Are any of you running a Chris Alston g-machine subframe on a 69 Camaro? I am trying to finish up a car with this subframe and I need to know what wheel size would work with it. I had a local shop do measurements and they are saying a 18"x7" wheel is all that will work up front.

Any of you have direct experience with this combo and willing to share your wheel dimensions?

[camcojb]

Have you contacted them directly? I'm positive it can take a wider wheel than that. Just found this:

http://www.cachassisworks.com/attach...701_ds_web.pdf

Camaro/Firebird 1969 - 11-11.6” tire section width (275 = 10.8”, *285 = 11.2”,*295 = 11.6”)
Typical sizes include: 275/45-16, 275/40-17, 275/35-18, 275/30-19, and 275/25-20. *285 & 295 series tire
can be used with a carefully selected wheel backspace that centers the tire in the allowable space.

[Redduck]

Thank you. I have contacted them directly, and unfortunately all they would tell me is that I would need to take measurements to get exact wheel sizes. In case it helps, here are the measurements I have:
Front Spacing: 3"
Back Spacing: 10.5"

[camcojb]

Originally Posted by Redduck

Thank you. I have contacted them directly, and unfortunately all they would tell me is that I would need to take measurements to get exact wheel sizes. In case it helps, here are the measurements I have:
Front Spacing: 3"
Back Spacing: 10.5"

I don't know what those measurements are. For a 275/35 or 40 or similar most guys run a 8" wheel with 5.25" bs. I'm sure you can run a 9 to 9.5" wheel up front.

These guys have a 67 on their FB page with the Chassisworks g machine subframe.

https://www.facebook.com/ProTouringG...14551622100952

[Redduck]

Thank you! I really appreciate the help!

[dhutton]

Originally Posted by Redduck

Thank you. I have contacted them directly, and unfortunately all they would tell me is that I would need to take measurements to get exact wheel sizes. In case it helps, here are the measurements I have:
Front Spacing: 3"
Back Spacing: 10.5"

Those numbers don’t make any sense to me. They imply a 12.5 inch wide wheel.

For stock WMS on a first gen the offset is +6mm regardless of wheel width to center wheel in the wheel tub.

Don

[Steve68]

I under stood a 10" wheel with a 305 tire would work, with larger wheels wells of course,

but it could be hearsay!

[joeko23]

I have their frame on my 69 Camaro. I have 275/35/18 tires with 9.5 wheel with 15mm offset which equates to about 5.75” offset. The only issue I have is the tire rubs the frame at lock to lock. I put a 1/4” spacer and it still rubbed the frame slightly so I had to put rack and pinion spacers to limit travel. I put 1 spacer on each side now no rubbing.

So with the 1/4” spacer my offset is 5.5” or 10mm. So I think your safe with 5.5”-5.75” of offset. You will definitely need the rack spacers. BTW, I have stock inner fender bolts and the tires do not rub on the bolts.

Here’s a link to the spacers.

1979-2004 Mustang Steering Rack Limiter Stop Spacers - 6pc https://a.co/d/gYb5BLz