On my current six Im going with a 54mm overall and a 9mm string spacing. Thats pretty much the norm I suppose. rather comfy too in my opinion. I recently rebuilt a bass for a fellow member that had 12mm spacing and 63mm overall at the nut, it was a bit too much....
So far most I have built were 2 1/8 to 2 1/4 at the nut. Or since we're talking so metrically 5.5 to 6 CM. I got that size from my Frenz basses, which all seem to be around that, very comfortable.
Dirk
On my current six Im going with a 54mm overall and a 9mm string spacing. Thats pretty much the norm I suppose. rather comfy too in my opinion. I recently rebuilt a bass for a fellow member that had 12mm spacing and 63mm overall at the nut, it was a bit too much....