I bought a Trek 1200 frame and fork set from a friend. And want to build a single speed out of it. Do you need a different rear wheel or just the hub? And is the right crank arm different or can you use a double or triple arm with a single spocket? Thanks
Do you want single speed or fixed gear? If you want single speed, it will cost you about $5-10.
Go the your LBS and buy some short stack BMX chainring bolts and some old cassette spacers.
1. Remove the outer chainring and use the the BMX chainring bolts with the small ring( 39T or 42T). It doesn't make a difference if you mount the ring on the inside or outside.
2. Remove all the cogs from the cassette. Save either the 15,16 or 17t cog. Install some spacers, the cog and more spacers. Make sure you line up the cog in line with the chainring. Tighten the lockring.
3. Hopefully the 1200 has horizontal or semi horizontal dropouts...If it does, shorten the chain...If it doesn't it will be harder(more expensive) to get the proper chain tension
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