The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
Diameter of standard vs. TRX's (archive)
[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Posted by Mark on April 28, 2000 at 15:37:45:

In Reply to: TRX wheel swap posted by Tom K on April 28, 2000 at 10:22:26:

I'm the guy who said do the math. I have a
degree in math, so don't feel bad.

The L6 TRX's had an overall diameter of 632mm.
(The M6 actually had an OD of 631mm)

The wheel you are suggesting has an OD of:
15*25.4 + 2*.6*225 = 651mm

The setup you are being tempted by is about
20mm larger. That's 3/4 of an inch! I would
not buy it.

The M6 rims were over 16 inches. Your car
had a rim under 16 inches. So it makes sense
to pick a rim size in the middle; i.e., 16".

Again the 225/50 ZR 16 diameter is exactly the
same for all intents and purposes (631.4mm).
I actually run a 245/45 ZR 16 in the rear in the
summer.

Now you have to worry about offsets. Your rim
width was 165mm = 6.5 inches with ~21mm offset.
You don't specify rim width and offset, and
don't bother until you have 16" rim picked out.




Follow Ups:


[ Follow Ups ] [ 6-series (E24) Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk.
Roadfly.com Logo © 1997 - 2008 Jump Internet Inc. All rights reserved.