'Upgraded' my winter commuter to a single speed. Cleaning out the garage, I came across my old rear wheel from when this was my SS MTB bike, Chris King rear hub.
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It took all I had to get the drive side BB (old square taper, steel threads bonded/galled to the aluminum BB shell) removed. Cheater bar w/pipe, wife holding the front of the bike, heat gun and PB blaster, finally got it out.
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New BB, old 104BCD XT crank, and a $20, 52 tooth hipster front ring off Amazon. I had a 19 tooth rear cog and singlulator on-hand...2.75ish:1 gear ratio.
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Only ridden it to work twice, but I like it so far. I've been commuting on my Larry vs. Harry Bullitt for a few years, forgot how twitchy this old 26 mtb can be, especially compared to riding a forward cargo bus.
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