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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 12-13-09, 03:58 PM   #1
thebigdeadwaltz
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Cog Removal from Unbuilt Hub

Alright, I got a nice hub with a cog but it's not built into a wheel. I managed to get the lockring off but I can't get the cog off for the life of me. I tried clamping the hub in a vise with some wood blocks, but still no luck. Any tips?
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Old 12-13-09, 04:15 PM   #2
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If it's practical, build the wheel, then remove cog.
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Old 12-13-09, 04:52 PM   #3
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lace up some spokes into a rim so that they are pulled on when removing the cog.

you don't need to lace up the entire wheel, nor does it need to be in tension. the hub just needs more leverage to stay put when you're loosening the cog, which is the rim.
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Old 12-13-09, 04:55 PM   #4
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try just putting 1 or 2 spokes through the hub to use to prevent the hub from spinning.
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Old 12-13-09, 05:24 PM   #5
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SNAP goes your hub. If you are only going to put a few spokes on to attach to a rim, make sure they are on the same side as the cog.

but, I'd either build the wheel first or just buy a new cog for the time being.
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Old 12-13-09, 05:40 PM   #6
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Put the cog in a vise and use a strapwrench on the hub.
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Old 12-13-09, 05:47 PM   #7
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Use a plasma cutter to cut the hub away from the cog.

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Old 12-13-09, 05:59 PM   #8
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Follows my rule of always using brute force when finesse would do...

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Use a plasma cutter to cut the hub away from the cog.

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Old 12-13-09, 06:07 PM   #9
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strapped

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Put the cog in a vise and use a strapwrench on the hub.
+1
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Old 12-13-09, 07:51 PM   #10
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Originally Posted by the_don View Post
SNAP goes your hub. If you are only going to put a few spokes on to attach to a rim, make sure they are on the same side as the cog.

but, I'd either build the wheel first or just buy a new cog for the time being.
cog will be in the way, cant get any spokes though.

just do what i did, lace up the opposite side to a rim and proceed to snap your otherwise pristine vintage dura ace track hub in half. looked like 10 pitch, but it had a regular cog. whatever.
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Old 12-13-09, 08:38 PM   #11
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Who was the smart guy that cut the hub out before removing the cog anyways...?
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Old 12-14-09, 08:35 AM   #12
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I got the hub off of eBay, so the seller was the guy that got me into this bind.

I tried a strapwrench, but that didn't work so hot. Not enough leverage.

It's a pretty big cog, 20t and it's solid on the sides so I can't get any spokes in that side.

I ended up clamping it in a vise, holding it with the strapwrench and gave it two bumps with an impact wrench and the cog came spinning off. Cog is a bit dented, but functionally okay. Looks like I'll be building up the wheel tonight!

Thanks a bunch for all the ideas!
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Old 12-14-09, 10:13 AM   #13
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OK, so we are going to need pics of this wheel build after the ordeal it was to get the cog loose.
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