Several manufactures, like Surly, state their bike will accept 42mm tires w/ fenders and 45mm w/out. The largest fender for a 700c bike that I can find is either the SKS P45 or Planet Bike Freddy Fender and they only accept a 35mm tire. I did try the SKS P50 which is designed for a 28" wheel and supposed accept 35-45mm tires but there was no way. It had less clearance than my p45's and simply didn't work on my LHT. It appeared to be designed for a 26" wheel. I contacted SKS and they admitted that fender doesn't work w/ all 700c bikes. It appears the Bluemels would work but they don't distribute in the US. At least that's what the SKS distributor told me.
Long question short: Who makes a fender for a 700c bike that will acccept a 42mm tire?