924 wheel sizes
 

I know nothing about wheel sizes etc and I was wondering what size wheels I would need to get the effect below or what sizes would be pushing the limit ,I have a 87 924s
https://cimg9.ibsrv.net/gimg/rennlis...abc975e66c.png

https://cimg0.ibsrv.net/gimg/rennlis...89d6f68abd.png

ET23 Fuchs 7x16's would stick out a mile so you can fit arches....


R

So 15x10s are a slim chance?

Fit whatever you want, just buy wider wheel arches !




R

Your 924 body was made for 52/53 mm offset wheels to fit under the fenders.

You could use "early offset" 944/911 wheels which would push your wheels out ~29mm outboard of the fenders so you'd need 1" or 1.25" flares per side.

Luckily since the 944 and 924 suspension parts are the same there isn't any extra stress put onto the suspension/bearings by changing this offset.

You actually could fit a 15x10" wheel in the BACK if you were so inclined but up front you might find such a wide wheel would rub on the wheel well/springs.

I couldn't be sure or not if the "Jacked Out" wheels on the early 44 created more stress, but they certainly change the Scrub radius & King Pin Inclination etc....


Because of this in my ownership & testing of early and later cars the early
944's do not handle as well as the 924S or the later 944 & 968


I'm sure Porsche changed the wishbone length on the later cars for these reasons (back to offsets in the Et50's) and it is odd and rushed? that they did what did they did with the early 44, to use exactly the same arm lengths as the 924 but to fit incorrect wheel offsets just to make the wheel fill the wider arches!




R

Would guess it was 1) for looks to fill the wider arches and 2) parts commonality to share wheels with 911 of the era.

It is interesting they went back to the 924 offset when modifying all the cars to fit ABS hardware though!

Yes it could of been just that at the time, easier to use the 911 derived et23 offset wheels, but it's unusual that Porsche do anything half cast, as usually everything is designed and set up to near perfection.


It could also be the case that when they went 944 ABS they thought it also best to return the suspension angles back to the ET50's because it is better? or because they were making wheels in these offsets?


There is something advantageous about wheels with positive offsets with high numbers, I once owned a Lotus Elan FWD which had ET60 wheels.
Lotus have a high reputation for Great Suspension design & Handling.

The early 944's I had often "kicked back" and the steering followed road contours and cambers too easily, also with a Manual rack it was quite hard to turn at speed not to mention parking.


R

Would you guys have any idea what flares those are?

those look like "universal" screw on flares rather than a porsche-924-specific item.
in all seriousness if you looked in an "off road" catalog you'd probably find something that would work.

https://cimg9.ibsrv.net/gimg/rennlis...f029fa5b0c.jpg

https://cimg1.ibsrv.net/gimg/rennlis...bebff383ea.jpg

https://cimg2.ibsrv.net/gimg/rennlis...d886bde400.jpg

What about those

The first set of flares are universal JDM flares on a car somewhere overseas, might be Australia if memory serves.

The second set of flares are the proper rallye style arches that are only being produced (as far as I know) by Pefa Designs in Europe.

American International Racing makes the proper D-Production flares.

CCP on eBay has flares that are a sort of mashup between the factory D-Prod and C-Prod flares...but not quite right for either.

I don't know anyone currently making the C-Prod kit.

10" wheels are a problem in the back due to the brake lines and the brackets for holding the brake lines. I had trouble with standard 9" ET65mm club sport wheels on the narrow body cars for this reason. If you want to run that wide, you not only need the flares, but you need an offset on the wheel that will put more of the width outboard than inboard to avoid above-noted interference.

Easiest path to big rubber in the back is to switch over to late (high) offset trailing arms and run late (high) offset wheels (sourced from a late 951) with arches.