Thread: Street Tires
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Old 08-18-2025, 04:20 PM
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Originally Posted by jhein View Post
Well, I talked with Dave at PTFB and I may be going down a rabbit hole. I was going to just do the rear suspension with sub frame connectors and solid sub frame bushings. Now I'm thinking about doing the whole front suspension too, possibly including G-bars. All because I asked about tires. LOL. And not only that, but with 17" wheels, I can get bigger front brakes too.

I guess I've already crossed the line into a restomod, I'm not sure of the exact definition of a pro touring car is but I might be getting there.
Mission creep for sure!

I just ordered a bunch of stuff myself. Decided to have Global West build me a set of their Cat5 leaf springs. The car is going to actually come up in the rear a little bit, so I added some QA1 double adjustable hybrid coil overs for the front and matching double adjustable shocks for the rear.

And yes, before somebody calls me on it, I still have misgivings on the hybrid coil-over design, specifically its propensity to side load the shock. However, as I researched for a couple weeks options that don't require fabrication, it was pretty easy to see why the design exists.

Without trial and error fitment, it's impossible to know if you'll be able to get a stud mount coilover like the RideTech HQ or the Verishock conversion to fit without having to cut out at least part of the upper spring perch. That the point you have to do that, there's no reason to use the stud mount and you should go to a Chicane mount of Global West's coilover mount to gain more shock length and get a double shear eye mount.

The QA1's were about the only reversible way I could get to a 600 lb spring that the car desperately needs. I still believe the Verishock design is superior, but going to a double adjustable from a non-adjustable will allow me to tune the balance I need a bit better.

I'm hoping with a bit more ride height and shock length, I'll have a slightly better ride as well. Through this process I did discover that the Hotchkis leaf springs I have on the car now were too short and have the shackles pointing towards the front of the car, reducing my available articulation. This is also likely one of the reasons the car has a good bit of impact harshness.

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1969 Pontiac Firebird
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