Personally, I wouldn't start out riding fixed off road. Try it first on pavement, and once you feel comfortable, then maybe go off road. Also, foot retention is essential when riding fixed, because you absolutely don't want your feet coming off the pedals at speed. I really don't see any advantage of riding fixed off road, and have never tried it myself. In fact, I really don't see any reason to ride a singlespeed bike off road. But as they say, À Chacun Son Goût.
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