How to Single Speed a Mountain Bike: Tips and Tricks for Simplifying Your Ride
To convert a mountain bike to a single speed, remove the gears and derailleurs, and replace the cassette with a single cog. Shorten the chain and adjust the chain tension using a tensioner or horizontal dropouts. Check that the crankset and chainring are compatible with the single cog setup, and adjust the chainline for maximum efficiency. Remember to re-adjust your riding style to accommodate the lack of gears.