I have the Kerscher vented disc brake kit with CB dropped spindles and 6" Fuch wheels. The tyres just rubbed against the stock fender arches a little bit when hard braking and crossing heavy bump that I needed to do some trimming at the arches. Before the conversion, I was having the stock spindle/drums with 5mm spacers and 6" Fuch wheels. I didn't actually measure the difference but obviously the vented discs are sticking out a little bit. I guess the vented discs plus CB spindles widen the track about 10mm each side comparing with the stock drums.
Tim
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