Rampar FF System
I want to covert my Rampar R-4 into a fixed gear. It is a 12 speed from the late 70's or early 80's (1982?). I read that the ff system would be unsafe because of the freewheel in the bottom bracket, but with a fixed gear bike, wouldn't I remove the freewheel anyway. There is a lockring on the casette that I have to get off, but could I take off the freewheel before I take off the lockring. Also, where can I find a 3/32 track sprocket with 18 or 20 tooth for the hub that is threaded, not splined. No store seems to have it.
there are very few track cogs that are splined, not threaded.
sheldonbrown.com, you seem to have a lot of questions, that site will answer most if not all of them.
You'll need to take the lockring off to get the cassette off. Figuring out which tool you'll need to get in order to get that lockring off may be a bit difficult but your LBS should be able to figure it out.
On this page you'll find lots of threaded cogs: http://sheldonbrown.com/harris/fixed-sprockets.html
Have you read this? http://sheldonbrown.com/fixed/index.html
thanks for the help. I figured out the freewheel is actually part of the bottom bracket, which needs some very special tool to remove, so I think this bike will become a singlespeed rather than a fixed gear.
Bicycle Repair Man !!!
Originally Posted by WashWizards727
The rear hub is actually a conventionally threaded hub with a special cogset that has no freewheel mechanism as the freewheel is of course housed in the bottom bracket.
They are a rather interesting system as you can shift gears while coasting.
I helped convert one to an ss by removing the freewheel and ghetto fixing a single cog in the rear but converting one to a fixed gear would entail changing the bottom bracket to a conventional one.