Prototipo 350 or 370mm?

I installed a 320 mm Prototipo and really enjoyed the extra room that it provided. At the same time, I installed a eccentric wheel spacer that lifted the steering wheel that also provided more room. Image Unavailable, Please Login

 

go with a 350, best compromise , a 320 would be significantly harder a low speed. 350 is a nice decrease from original size wheel.

 

I have a perfect Prototipo that came with my GT4, I located and replaced it with an original. I will measure it later today. Peter.

 

It’s 350mm, let me know if your interested in it. I have no need for it now.
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350mm is too big (another 320mm ex-308 user). I'd add that the "eccentricity" that 4right mentioned can also be a factor. The 320mm MOMO Corse that I presently have in my TR has a built-in eccentricity that shifts the steering wheel upward when in the straight ahead position, but the photo of the 350mm Prototipo that Peter D posted looks to have an eccentricity in the other direction when in the straight ahead position. Stock TR use a 365mm steering wheel, IIRC, as do Stock Mondial, I think -- maybe you could try one of those on just to get a rough idea of what a 370mm would feel/look like.

 

I will add that the reason that I went with the 320 wheel was to gain more leg room. Steering effort wasn’t a consideration. Although, I don’t really sense a major difference between the two. My leg would get wedged between the shifter and the steering wheel in reverse. The new wheel and spacer eliminated this issue.

 

That is why I also installed the eccentric spacer, it lifts the steering wheel, to provide more leg room, but also to enable you to see all of the gauges.

 

If money isn’t a significant factor, I would suggest that you get a used wheel from the time period that your car was manufactured so that it looks more correct. Mine is a stacked MOMO from the early 70’s. Image Unavailable, Please Login Image Unavailable, Please Login

 

I plan to fit a black 350mm prototipo to my 328 simply for a different aesthetic. I have old air cooled 911’s and one has a 350 and one a 380mm. The 380 transforms the car. I can’t speak for the 328 yet but will run a 380 on that to see how it works. Just waiting on a 50mm spacer to arrive to get the wheel closer. The 308/328 wheel rake angle plus the 50mm spacer might raise the 380 enough to negate leg clearance issues with the extra diameter.

 

I will lend you a 370 if you want. It's not right in a 328. You won't like it.