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Fixed gear Brompton? Unless your using two brakes to slow, any pressure on the chain will just pull the tensioner out and therefore not slow you, will be a right old mess. Unless you add a lock to the rear end and don’t fold it, not going to be suitable!
Rhobbs-
Fixed gear Bromtpon works perfectly happily for me. I've never tried skidding it as it's a PowerTap rear wheel and it'll unwind itself if try. But you can't certainly slow down just using the fixed gear, and the tensioner never gets pulled out. It just jiggles slightly as the bottom part of the chain goes rigid. I've got two brakes anyway.
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There have been a few examples on here of people managing it. I'm not aware of any issues, but I accept the experience won't be exactly the same. This is @littlepixel 's
Edit: @danstuff beat me to it
Brommers
finger_jockey
Which chain tensioner are you using on this? I'm doing a fixed conversion and would like to use anything other than a standard Brompton one.