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Old 10-19-05, 12:29 PM   #1
MacG
don't pedal backwards...
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disassembling freewheel bearings

I searched around and found that the general concensus is to pitch a freewheel rather than trying to service it, but I have a slightly different situation.

I need a singlespeed freewheel with about 30 or 32 teeth, which simply can't be had commercially. My plan is to weld a 32 tooth sprocket from a disassembled multispeed freewheel onto the outer housing of a common BMX singlespeed freewheel, but I need to undo the bearings to have any hope of welding on it without damaging things too badly.

I see that most (all?) freewheels have a plate or nut that accepts a pin spanner. Are these a standard size, or does this vary?

Which way should this be turned to remove it? (advance warning of lefty threads is always nice...)

What will I find when this part is removed? Is it a bearing cone, or is the bearing actually contained beneath this part?

Anything special about putting it together? Lashing the bearings, etc?

This is for a retro-direct conversion I've been sitting on for too long now. Time to scare up some parts, break out the welder, and get a rideable product.
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Old 10-19-05, 01:20 PM   #2
Rev.Chuck
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I use the red handled Park pin spanners

Left hand threads

When you take off the plate, you will see that it is a cone and you will see the upper set of bearings and probably a couple of clearance shims.

The part of the freewheel that the gears are on will lift off and then the lower set of balls will fall everywhere. The ratchets and spring will probably stay in place on the main hub.

You need to gease the lower set of ball in place, reinstall the gear hub, install the upper set of balls and shims then tighten the cone back up.

Don't use to much grese esp. where the ratchets are, the thing will either stick and freewheel or the whole thing will stick and feed chain(For a single speed not to big a deal) I like to use Phil tenacious oil in the freewheels.
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Old 10-19-05, 01:36 PM   #3
MacG
don't pedal backwards...
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That's what I was looking for. Thanks!
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