Join Date: Nov 2011
Bikes: Surly Ice Cream Truck, Traitor Ruben, Redline Monocog 29er
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Hey, since I live in your neck of the woods, I'll give you my experiences: I've had winter bikes running both kinds of bottom brackets and haven't had any more issues with the outboard bearing than the cartridge bottom brackets. I was a little worried too, when I went to outboard bearing, but they seem to be pretty durable and don't gunk up any more than the older kind.
Right now both my bikes use the shimano hollowtech bbs. My 'cross bike has the cheapest variety and that has held up for about two years through every kind of weather and probably close to 15-20k miles. My mtb, my main winter whip, has an XT. The crankset came with a Raceface outboard bearing bb, but that thing was a piece of **** and lasted all of about 2 weeks. My mtb hangs out outside all winter long and stays pretty grungy, but I've never had any problems with the cranks or bottom bracket.