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Been thinking of getting a set of Tramont's for the Turbo, and of course offsets are the big discussion point. I am of course interested to see what people are running for wide bodies, but it would be also good to note the narrow body setup.
For example, Front 8.5 ET45, Rear 11 ET38 seem to be the standard for a WB, but it's also been a bit tight on at least one example in the rear. Tramont seems to vary a bit in their recommendations too.
If everyone posts, I will list them as a summary on the top of the thread.
Please post:
Model
Fronts
Rears
Tires
and picts if you have them, especially side shots that show the offsets ...
Summary Results:
Wide Body
Tramont's recommendation : Front 8.5 x 18 ET41 , Rear 10x18 ET31
Dick in TN : Fronts 8.5 X 18 ET45, Rear 11 X 18 ET38 (from previous threads)
Narrow Body
Tramont's recommendation : Front 18x8.5 ET52, Rear 18x10 ET59
Jiaa : F 18x8.5 ET+47, R 18x10 ET+58
Note:
Why the heck Tramont recommends two different sizes for what is essentially the same front end I am not sure of, unless there are issues with brake clearance with the big reds, or trying to balance front to baks ..
This is great timing. I been thinking of getting a set of Tramonts also for a WB. Thanks for starting the post.
Tremont recommended the following for my C4S:
8.5 x 18 ET 41 (2" outer rim) front
11 x 18 ET 35 (3,5" outer rim) rear
I have a narrow body so my rear sizing is not applicable for this thread. I am to understand the front fenders / clearances are the same between WB and NB cars.
Tramont's TUV-approved sizing for NB cars are:
F 18x8.5 ET+52
R 18x10 ET+59
Ultimately I went with their sizes, but I subtracted 1mm from the rear for 1mm more "poke" when ordering. For the fronts, I ran with the 52mm offset for a few years and then decided that the fronts could also use more "poke" to match the rears, and therefore I added 5mm hubcentric spacers in the front. The pictures below show the result of the front wheels with spacers. My final "equivalent" measurements are:
F 18x8.5 ET+47 (including 5mm hubcentric spacer)
R 18x10 ET+58 (1mm more poke than Tramont's TUV approved sizing)
Tires are Bridgestone Pole Position S04
F 225/40/18
R 265/35/18
Last edited by Jlaa; 03-19-2017 at 06:17 PM.
Reason: tires
8.5x18, et 45 fronts, with 235/40/18 Hankook Ventus Evo's
11x18, et 38 rears, with 295/30/18 Hankook's
Exact ride height unknown
As mentioned on a previous thread, the rears fit tighter on the left, than right. I did measure a slight difference between the two rear wheels...simple straight edge, ruler measurement. That being said, there did appear to be a few mm of manufacturing difference between the two rear wheels. But, we have all heard many times that these cars can routinely exhibit subtle differences from their essentially hand built origins.
I plan to finally play with the car a little this weekend...as in get it up on the lift, pull the wheels, and start a good cleaning. Still almost 2' of snow on the ground here, after last weeks Noreaster, so it will be a while before the car leaves the shed. I'll try and take a few fittment pictures, before she goes airborne.
As I have said many times, on many threads where OP's ask about Tramont Cup's....I just think these wheels are the bomb. If the need to have original Speedline RS wheels isn't the driving force, and you are simply interested in a quality, and affordable twin...then the Tramont Cup is the way to go.
First I would advise doing the plumb bob test to see how much variation you have in your body left vs right vs your wheel position. You have to plan your offset based on the side that has the smallest clearance. I didn't do that when I ordered my Tramonts because I never noticed the difference with either the stock wheels or my 996TT wheels. I don't have any rubbing but I don't like the look on the left side.
The 996TT wheels are 1/2" inboard on the left and 1" on the right. To my eye this looks much better on a 993TT. From the photos I've seen Porsche never had any of the cars they made in that era, even the rare sport versions such as the 993RS and the 993GT2's, both which were came with Speedlines, with offsets where the wheel was flush with the fender.
Don't want to mislead anyone, in my opinion Tramont Cups (or Speedlines) are the most beautiful wheels you can put on a 993, and look great on both the NB and the WB, thanks to their three piece design and the availability of different offsets.
Tramont quality is superb.
295 Sumitomo on 11" Tramont. Another brand 295 tire might have a different sidewall profile which fits without the gap between the tire and the rim you see here. Other Rennlisters who have Tramonts may comment on this.
295 Sumitomo on 11" Tramont. Another brand 295 tire might have a different sidewall profile which fits without the gap between the tire and the rim you see here. Other Rennlisters who have Tramonts may comment on this.
Wow, that *is* a funky gap. Which Sumitomo tire is this??
I don't have that gap. See below two pictures.
- The first picture is a Tramont 8.5" wheel with a Bridgestone PP S04 225-width tire.
- The second picture is a Tramont 10" wheel with a Bridgestone PP S04 265-width tire.
Note that the Bridgestone PP S04 has a sizable rim protector "flange" molded into the sidewall.
I also have a Sumitomo HTRZ III tire --- 245 section width. It is mounted on a 8.25" wide Mercedes R129 wheel that I use as a spare tire. See the third picture that illustrates this --- there's no gap, but the Mercedes' wheel bead is different. However you can tell that there is very little rim protector "flange" on the Sumitomo HTRZIII.
the Sumi's are an undersized 295 to begin with and they don't have any rim edge protector to speak of. I noticed a big difference in filling out the wheel with a new Michelin 295.
03-19-2017, 12:13 PM
Tramont Sizing Survey
