Very good. But it can't be done, for the reasons mentioned in post 2 of this thread.Here is the (top view) pic of my single speed. I just want front derailleur to be fit on this so that it can be easy on inclines.
@User has similar on one of his bikes, although both the sprockets are on the same side of the rear wheel. The difference in teeth between chain ring one and chain ring two is the same as the difference between sprocket one and sprocket two but in the "other direction IYSWIM" so the chain length remains the same. Changing gear is achieved, I think, by stopping, fiddling and restarting. Another option for the OP is a Sturmey Archer fixed two or three speed hub but that would entail a wheel rebuild.I ran a fixed with a double chain ring. But there is no way you can change gear on the move.
I had 42/52 on the front, coupled with a double fixed rear hub. Cant remember the exact sprocket size, but probably a 14 on one side and an 18 on the other. This meant I could ride out to an event on the 42/18, then flip the wheel and ride 52/14 for the time trial.
As long as you have horizontal drop outs, you can slide the rear wheel to take up any slack in the chain.
Ah, that small, but important, detail had passed me by.It isn't fixed though, so it is OK to have the chain slack enough to do the shift.
It isn't fixed though, so it is OK to have the chain slack enough to do the shift.
The OP says he has a fixer. Can you tell from the photo that it is in fact a single speed? Adrian has a single speed on which he has two sprockets and two chain rings. AFAIK he hasn't needed a trip to A&E or an emergency dentist.Appears to be a singlespeed freewheel, but if he attempts this, it will end in tears. You do need good tension, and trying a silly mod like that will end in a trip to A&E or the emergency Dentist.
The OP says he has a fixer. Can you tell from the photo that it is in fact a single speed? Adrian has a single speed on which he has two sprockets and two chain rings. AFAIK he hasn't needed a trip to A&E or an emergency dentist.