I took delivery the other day of a pair of very swish black SKS P45 mudguards. These mudguards will fit tyre widths 32-37mm. The tyres of the Dew Drop are 37mm so this allows me to put some thinner tyres for the summer commute.
I have read on various forums and websites that installing these on a bicycle equipped with disc brakes is not an easy task. This is because the brake unit is bolted onto the eyelet normally used to mount the front mudguard. The rear eyelet is available but the rear mudguard stay fouls the brake accentuating lever. So what is the solution?
Firstly the front mudguard. The kona fork provides bosses halfway up the fork which can be used instead of the ones taken by the disc brake unit. I screwed the secu-clips stay attachments into place then bent the upper stays by hand and screwed them into place. I then marked them and then used a large hack saw to saw off the protruding bits of metal. The result is a curved top stay which some would say looks a little odd. I have got used to it now :-).
I screwed the bottom of the rear guard into place using the helpfully provided screw hole then slid the mudguard clip into place at the top of the rear seat stay. I then slotted in and tightened the stays into the rear mudguard and then bent the disc-side stay around the brake accentuating lever. The other side mounted normally with no bodging required.
New mudguards 
Front 
Rear 
Rear