I've got an early-mid 2000's Trek touring frame, I think – got it about 6 years ago at a local bike co-op for my first (and only) ground-up build, and had it powder coated, and unfortunately I didn’t write down any info on it before that.
I moved from the flatland to the mountains a couple year ago and have done my best to make it a gravel-worthy bike:
However, on the century ride I did last summer that included 8,0000 feet of elevation, I realized how badly it is outmatched with the 11-28 cassette and 32mm tires. So now I'm looking at what it would take to get it more capable of 10 percent gravel climbs.
I'd ideally like to get 650b wheels to hopefully allow for 38-40mm tire, an 11-speed cassette, and disc brakes. I'm unsure whether the frame is compatible with IS mounted calipers. There are two threadless holes on the non-drive side that measure 51mm apart at the outer part of the holes:
If this is not for an IS caliper mount, my next question would be: does anyone have a suggestion for 650b quick release wheels with a 135mm hub that can fit an 11-speed cassette?
If that's not a thing, then how about suggestions for a 650b quick release wheel with a 135mm hub that can fit an 11-speed cassette and is rim-brake compatible?
I am very attached to this frame, as it has carried me through every type of weather as a commuter, and mountain bike trails high in the mountains.