GlenL

Wanted a clarification from folks who've been there.

If I want to run PCA G class club racing, what are the largest wheels I can have. My car came originally with 16x7 wheels all around. Looking at the rules I think 17x8 is ok but 17x9 is out.

If you're wondering, the car (pictured) would be H except for the one-class bump for being a higher powered Euro.

chrisp

It's one inch wider than otherwise regularly available at any point during your model series' production run. For example, most 911SC's came with 6" and 7" rims. There is some variant during the SC run 1978-1983 that came with 7" and 8". So for G class we can run 8's and 9's. Diameter doesn't matter, only width. Double check the rules though.

Jack667

Glen - here's another thought, but again - double check -
You can run 1" wider than the largest diameter wheel available as an option for you model. So - if there was an option for 8" wide wheels, you can go to with 9" wide.
Also, it looks like you understand the difference between Euro Stock and Euro Prepared - that you don't get to take advantage of Prepared mods in G. If you went with any prepared mods (like wheels 2" wider than stock), you would be bumped to F.
Good Luck!

GlenL

Thanks, guys.

Not planning on upgrading the vehicle to S4 (7s/8s) or 89GT (8s/9s) equipment so looks like I'm stuck at 8s all around.

chrisp

I would ask around within the 928 circles and/or email Lance at PCA Racing for clarification. If you think there's a car within your class that originally came with 8/9 then that means the fast guys are running 9's/10's (if they fit). If you have 8's all around, you'll go plenty fast and have just as much fun but as far as being near the front my guess is that being down 2" in wheel width would be a big deal.

GlenL

I've looked into the available options and model upgrade approaches to getting wider wheels. Unfortunately, none were offered until late '86 and that would put me up a couple of classes...and I'd need a new engine, transmission and suspension.

chrisp

Yeah that's an expensive upgrade isn't it?

GlenL

Gotta draw the line somewhere!

I'm looking at Kinesis, Fikse and Complete Custom wheels. Any other suggestions for track wheels? Price more important than curb appeal.

Bill L Seifert

I might be wrong, but I believe you can use one inch wider than the max width that came on your car, even as an option. So, on the 928, 8 rear and 7 rear was the widest as an option. So you can run 9 rear and 8 front. Diameter, I think is free.

Remember in the 70-80's the average 911 came with 7 rear and 6 front, but 8 rear and 7 front was optional, just as it was for 944's, which mostly came with 7" all round cookies. So you can go to 9 rear and 8 front.

Bill Seifert

1987 944S Race Car under const

Mike Buck

I'm no 928 expert, but IIRC, 928's did not come with a staggered wheel setup until '87 with the introduction of the S4. The S4 was the first with wider 16x8" rears. There were no optional wheels until the 928 GT came out, and the upgrade was from 7.5"(cast) fronts to 8"(forged). All GT's had 9" rears stock. The GTS which came later had 7.5" fronts with no optional wider size. One could only run 9's and 10's in a stock class(E) on a 928 GT in my mind.

The early 928's that run in H and F stock are limited to 7"+1" all around. Diameter is free. A '80 Euro running in G would have the same limitation.

Bill L Seifert

I stand corrected.

Bill

GlenL

Mike has the history about right. (If anyone is really interested go to www.928gt.com and click through to the tips.)

The complicating issue is that for the local PCA club's (Nord Stern) AX and time trial points series, I can go to 9" wheels. Decisions, decisions...

Still hoping for more ideas on vendors.

B&G

Glen,

The problem with 17s is that most sizes available in R compound tires have a larger rolling diameter than what most P-cars came with. For Hoosiers, the 255/45/17 has a diameter of 25.8" where the standard 245/45/16 is 24.4". 275/45/17s are a little better at 25.2", but the increased diameter makes for a taller final drive, which can change shift points on the track, and slightly decrease acceleration. Its seems like an insignificant difference, but talk to some guys that have run 17s on their cars and see what their impressions are.

I know a lot of guys run 17s, but the trend is going towards 18s with 285/30s. They have nearly the same diameter as the 16s, so they dont affect the final drive ratio.

And if you think about it, a 255-17 is not that much wider than a 245-16 from a contact patch standpoint. And if you can fit a 275-17 under your fenders, you can probably also squeeze a 285-18 in there. So you may want to consider sticking with 8 x 16" wheels (phone dials, dish, design 90s) all the way around, or jumping up to 18s. Just something to think about.