I have two Specialized MTB's in regular use. The red and white Stumpjumper is set up with a modern 1x9 drivetrain and Big Apples. I haul my grocery trailer with it, among other things. The black (drewed and powdercoated) Rockhopper is a fixed gear bike that is a fun to ride and I use it all the time for around town things when I don't have to haul much.
Both are nimble but tough bikes that are endlessly useful and fun.
jim
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Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...
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SB forever