Thanks for the info on your track width - I'm preparing to setup my 78 R100/7 with a DMC subframe and a Sputnik car - I figured that the minimum track width would be around 48", and this will be my first sidecar, so for me, going a bit wider makes sense. At least with a wider track (within reason), one isn't so hemmed in when trying to do valve adjustments, etc.

Beautiful looking rig - I hope that mine comes out at least to something approaching that, in time.