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Fat Rat

Esteemed Pedelecer
Jun 7, 2018
1,903
726
UK
Hi again
You do realise this is the introduction section you will get more answers / advice in other sections
 

vfr400

Esteemed Pedelecer
Jun 12, 2011
9,822
3,986
Basildon
You have to look at the left side of the motor. the bike has rim brakes, so that probably means standard 135mm width, but it might have been planned to use the band brake, in which case it'll be much wider. You can see whether it has the gap for the band brake when you look at the bike, but it's not shown in the photo.

I just found this photo, which seems to show the threaded boss for the bad brake and the gap, so I'd say 150mm.