SKS won't fit onto a Defy because it uses normal shallow drop brakes. The Defy specific ones have a cut away section to fit around the brakes.
I had a set of cruds Mk2's on my Defy and I hated them so much I never used them. I have now fitted some Giant ones and they are almost as good as SKS ones (not quite the wrap around of SKS) so I would suggest you buy those.
Of course if you want to keep removing and refitting the guards then Cruds would be better but I leave my on all of the time along with a rack.
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I had a set of cruds Mk2's on my Defy and I hated them so much I never used them. I have now fitted some Giant ones and they are almost as good as SKS ones (not quite the wrap around of SKS) so I would suggest you buy those.
Of course if you want to keep removing and refitting the guards then Cruds would be better but I leave my on all of the time along with a rack.
The giants if is then!!