Registered Forum User
WSB Hero
Posts: 8,863
Join Date: May 2002
Location: Boys Town
Mood: www.cantbearsed.co.uk
As Payned said above, I ran single disk with P4 for almost a couple of seasons on my 620. I found that pad wear was dreadful until I found the right combination of pad / disk.
The brakes were plenty good enough and really improved the turn in of the bike and reduced unsprung weight massively.