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The first thing to note is that widely-spaced forks - e.g. capable of clearing a 2.2" tyre - will twist the actual mountings so that it won't sit properly on the forks. The second thing is that chunky forks, like on an offroad 29er, mean that the mudguard mounting sits on the back of the fork rather than cradling it securely. Unfortunately, that describes my forks perfectly!
The mountings were twisted vertically inwards at the top and horizontally inwards at the back when fitted to the fork. And while I could tighten up the straps to stop it from moving, the stress on both the strap and the mountings means that one or the other would probably fail in quite a short time. If I still had my Boardman CX Comp I feel positive that this would have been ideal as a front mudguard on that. But I sold that when I bought this Kona.
I test fitted it to the seat stays as a rear mudguard as well, it mounted on the smaller diameter tubing much more securely, hugging the tyre while still giving ample clearance. I then tried fitting it on the other side of the seat stays so that it protects the front mech from road spray and again, it fitted there perfectly and almost unnoticeably! In the past I've generally used an old front mudguard with a couple of holes drilled at the ends, ziptied to the seat- and chainstay braces to secure it as a means to keep the crud off the mech; this time I think I'm going to leave this SKS one there. Sure, I could return it - but it will earn its keep doing what I want it to do rather than what the manufacturers intended.
TL,DR: It's meant for road bikes with skinny forks that take a 38c tyre maximum. The mudguard is good for a 50-622, not so the mountings. Great piece of kit tho.
I bought this to fit to my Cannondale Synapse before a big ride (the previous front mudguard had broken - the rear was still ok. It took about a minute to fit and did not require any adjustment of the bolts. During the ride it stayed secure over some fairly varied terrain and kept alot of water off me. It is not as good as a proper front guard as spray can still come up in front of the fork and be blown back at you but this is something I can accept as the product is so easy to fit.
This was a lot lighter than I thought it was going to be. Just used it for the first time this morning in the puddles and I do not have splashes going up my leg this morning for work. I think I would of preferred an extra inch as I have 28 inch wheels but no mudguard is 100% splash proof let's be honest.