Not a Riv, but pretty similar in my book, my Black Mountain Monster Cross was dropped off a day early by Fedex. Pleasant surprise. I rode me Clem in today which is shod with 29x2.1" Thunderburts. Thought, why not try those to check clearances. Extremely surprised to find that Thunderburts fit, with room for fenders. Due to the horizontal dropouts though, it's tight squeeze to get the wheel in with a Thunderburt. Mine will be set up initially as fixed/single. I'll most likely order up another pair of Thunderburts. This'll round out my current bike stable nicely with a Clem for daily meandering, Redwood for roads, Schwinn Voyageur as a lock-up bike, and the Monster Cross as a great all-rounder. David Chicago
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