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Not a dumb question

If the cog unscrews at high speed, the cog and chain can jam, locking up the rear wheel and causing an uncontrollable skid that will result in a crash, regardless of brake use. Using the brakes rather than back-pressure to stop will make the whole scenario less likely, but the brakes won't help if you do throw it.

PdxMark is right about this being an endlessly debated topic. Personally, I'm with RUSA (actually, I ride with him occasionally) -- my fixies have regular freewheel hubs. I clean the threads well, use lots of Loctite, and thread the cog on very tight. I've never had a cog loosen. But I use my front brake for any major braking effort.
 
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