I had one bridge break recently due to carrying the bike on the car roof. The wind caused the mudguard to flutter, and fatigued and broke the bridge. It's now held in place with indestructible cable ties.The small metal stay connectors used to be made from stainless steel, but are now really soft metal, you can snap them by over-tightening with a short spanner.
Mine have lasted nearly 8 years, granted I don't do the mileage you do, but I can put in some distance compared with many, and they are on pretty much all the time.There too brittle on a road bike, leave them too long and they won't be there when you really need them.
Quoted for truthLife's easier (and more fun) on a tourer!
I maybe should try a different brand from SKS. In Scotland they'd fail all the time, they do last a bit better down here with the smoother roads :-/Mine seem to last for years and they are not expensive to buy.
Two seasons up north. Crap roads, decent descending 25mm and being a light weight dont seem to mix, well not for SKS blumels anyway :-/How long is too long, mine are about 5 years old now on one of the bikes and seem fine.
Ive never had more than 3 seasons out of SKS Blumels in Scotland where surfaces are cr@p (by the 2nd year they'll be heavily duct taped together), they do get exposed to high speed and reasonable distance though :-/Mine have lasted nearly 8 years, granted I don't do the mileage you do, but I can put in some distance compared with many, and they are on pretty much all the time.
@Jimidh It could be argued the opposite, I prefer the look of mine with.
I work on the Lincs/Notts border now there like carpets compared to home, Ive never been north of Lincoln city though :-/On my visits to Scotland the roads always seem far better than Lincolnshire.