I think it's -40mm. A bit low if you ask me. -25 - 30 mm would be perfect in terms of ride comfort and practicality.
Rims are 15x7" bbs-mahle, specially made for E21 Tires are 205/50 R15
This must be one of the best restaurations I have ever seen outside/inside/underside ... all looks like it just rolled out of the bmw factory .... TOP RESTAURATION