Mudguard problems - any ideas?

Riveted guards will eventually fall apart. These are almost indestructible -

http://www.sjscycles.co.uk/m:part-primoplastic-mudguard-set-700c-prod35071/

I had a black cab rear end me at walking speed the other week, rear wheel buckled, mudguard popped out of it's quick release stays, put them back in and completely undamaged!

Haven't has a single issue with my SKS P35's yet. Pain in the arse to initially fit them, but no vibration or movement yet. Couldn't ask for anything more than that.

I had Tortec on my commuter bike which lasted maybe 8 years until they got thoroughly cracked by work bike stands. I recently replaced them with the very sturdy SKS P45 which I expect will last just as long I riveted the old front mud-flap onto the new rear after shortening it so that it fits in work bike stands without there being any pressure on the mudguard.

had sks chromoplastics fitted to a selection of bikes over the years and
never had a problem. If you've got the clearance and fittings I'd say go for the
full versions.

Tintow, a, b and c I think! I recently had to gaffa tape my rear sks commuter as it cracked in two places. I then ran over something when not paying proper attention in the dark (i had lights on so no excuse), whatever it was flicked up and concertina'd the entire guard like scrunched up paper. I've now had to replace with a cheap pair from a lbs. The only thing I can think was the problem that they don't handle mechanical stresses when not set up perfectly... I had sheared the seat stay bolt off last summer taking them off which meant I had to fashion a clip which probably wasn't spot on and the stresses caused them to fracture. You live and you learn!

Had almost the identical problem with SKS on my pompetamine, although it was only the rear that was fissioning. I, too, switched to Tortec reflectors last year and have not suffered the same problem.
(Re-used the stays and the larger rear mudflap, thereby demonstrating that the Tortec 'guard is stronger.)

Plus one for the Tortec Reflectors. They have an angular profile, rather than a curved shape (like Blumels etc), which may give them a bit of extra rigidity?

Sorry, can't answer your question.

Have had Tortec Reflector full length guards on the winter bike for 5 years now. They've been used in all weathers, had tons of mud, water and good dose of salt thrown at them and, despite infrequent washing, are still in great nick.

http://road.cc/content/review/2716-tortec-reflector-mudguards

I bought whyte mudguards, they are aluminium coated in plastic, have great fixings and have been solid so far this winter. The bike still gets filthy but I don't

My rear lasted 12 rides before snapping. I think the problem is the fact that they only have one stay which leaves a long section of guard between the frame fixing point and the stay which flexes too much. I have just ordered a new set which have the traditional 2 sets of stays.