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fixed gear hub removal(6 posts)

fixed gear hub removalGall
Oct 25, 2002 2:23 PM
Hello,

I am trying to remove my fixed gear hub. what my LBS did was took a regular rear wheel with a freewheel hub, removed the freewheel hub and put a different hub on to make it fixed gear.

now i want to remove it so i can either that freewheel back on or put a single bmx freewheel. BUT how? on this hub there isnt a place to wrench it. it looks like i have to pound it out. but before i go pounding i thought i d ask first LOL...

thanks!

gall
huh?desmo
Oct 25, 2002 4:18 PM
the words you use do not exactly make sense to me but I'll take a stab at it. if you have an old style freewheel hub, that your LBS removed the freewheel from then threaded on a track cog to give you a fixed single cog rear hub. then you only need a chain whip to remove the cog. I'm assuming they did not use a lock ring or old bottom bracket ring as a lock ring. if so you will need a tool to unscrew that as well. assuming you have these tools just unscrew said ring and cog in a counter clockwise rotation (if looking at the driveside of the wheel.) if not have the LBS do it for you.
not exactlyeddie m
Oct 26, 2002 6:12 AM
If your hub is an old freewheel hub, the lockring will turn off in a counterclockwise direction, but if the hub was replaced with a real fixed hub, the lockring will be slightly smaller diameter than a bottom bracket lockring, and will turn off in a clockwise direction. In either case the cog will turn off counterclockwise.
As others saidKerry
Oct 26, 2002 11:50 AM
"remove the hub" suggests building a new wheel. But it sounds like your shop simply took off the FW and threaded on a track sprocket and a lock ring? If they rebuilt the wheel with a track hub (one set of threads for the sprocket and another set (smaller diameter, reverse thread) for the lock ring, then you have to have the wheel rebuilt (again) to put an FW back on. Not at all clear what you mean by "pound it out." Any FW (BMX or road) requires a specific tool to remove it. The level of your question suggests that you should not work on this yourself. Find someone who knows this stuff or take it back to the bike shop and have them explain it to you. You have not explained it very well here.
No-tools cog removalStraightblock
Oct 26, 2002 7:58 PM
Kerry's advice was good. You might be better off having the LBS remove the cog for you. If you carry the wheel in by itself, it's about a 10-second job with a chain whip. They might do it for nothing if you're a regular.

For the rest of you, a fixed(track) cog can be removed without tools, providing there's no lockring outside the cog.

Loosen the rear wheel, and drop the chain off the chainring onto the bottom bracket shell. Keep the chain on the rear cog.



Grab the top length of the chain, and pull it around the front of the fixed cog. With your other hand, slowly rotate the rear wheel clockwise (direction it turns when you ride), and allow the part of the chain you're pulling to wrap around the bottom of the cog and double over itself, pinched between the cog and the bottom length of the chain. The chain will be tight against the bottom bracket.



Now with both hands, rotate the rear wheel clockwise.



It'll take some force, but the cog will break free.

A few warnings:

Of course this only works with fixed cogs. For single freewheels, you'll still need the correct tool.

If there's a lockring and you didn't take it off first, or you turn the wheel the wrong way, the cog won't come off. If you keep forcing it, you're going to break something.

Don't allow the chain to drop between the crank arm and the side of the bottom bracket or it'll wedge tight.

Obviously, when the chain comes in contact with the bottom bracket shell and the chainstay, some cosmetic damage can occur. This procedure is best used on bikes where you're not concerned with concours appearance. I used to keep a short piece of Tressostar cotton handlebar tape wrapped around the right side of the bottom bracket shell to protect the paint and didn't have any serious paint damage. You might wrap a rag around where the chain makes contact with the frame. Proceed at your own risk.
re: fixed gear hub removalGall
Oct 27, 2002 7:58 AM
http://www.sheldonbrown.com/harris/fixed-hubs.html

the surly..