bmwe21.net forums

What were the factory thicknesses of front and rear arb's? And what for after market ones?
My car has 22.5 mm front and 16mm rear. As far as I remember, the rear one was added at a point of time, as it is (was) a 316 so there wasn't any rear arb
However, is the 22,5 mm a factory thickness for the 316? Or should it be thinner, like 21mm ? I don't know if we had this one replaced when the rear one was added

Are you not familiar with etk.cc? Why not just look it up..

Org BMW:
Front: There has never been a 22,5mm or 21mm. There have been 22, 23, and 23,5mm.

Rear: 16mm and 17 mm.

Aftermarket:
The only one I am sure about is ST Suspension 25mm front/19mm rear.

Did Whiteline do one?

Also, Alpina and maybe Hartge did some.

Yup, there were a few different versions depending on engine, suspension package and year. And indeed Alpina and Hartge did thicker ones where the rears were 3 or 4 way adjustable. Rare as hen's teeth!

Ok, mine is probably the 22mm one
(we found it 22,5 but maybe this extra thickness is dirt?? lol)
So I do have the front one from factory, and we added a rear one (16mm) at a certain point of time.

What pros and what cons would a pair of thicker ones have?

i have an euro 1979 320/6 and my front bar is 19mm, 16mm rear! i´m going to upgrade for the ST kit, 25mm front, 19mm rear!