Advice for removing sprocket from New Departure hub

[Rivnut]

I need to swap sprockets on a New Departure hub - skip tooth for regular pitch. I’ve got it down to the basics - left hand thread to remove the outer ring and remove the bearing. I know that the sprocket right hand threads. The hub is not laced into a wheel, but it is complete. Any advice is welcome. Tools? Technique?

Thanks,
Ed

 

[49autocycledeluxe]

remove the sprocket from the hub and put it in a vice, then use a punch and hammer to tap the outer ring loose and unscrew it. learnt that right here on the CABE.

 

[Craig Allen]

I always thought it best to put the hub in a lathe with a 4 jaw chuck, but a 3 jaw will also work. This allows more even pressure instead of 2 pressure points in a vise. Also, I use a short brass or bronze bar for hammering, to remove the outer ring and sprocket.

 

[Rivnut]

We’ll, I guess that I wasn’t tapping hard enough. I think I need some brass jaws for my vice first. Thanks. I guess I just needed some reinforcement that my technique was correct.

Ed

 

[Rivnut]

PS - does having a chain whip help!

 

[49autocycledeluxe]

PS - does having a chain whip help!

no.^^^ brass jaws, or a piece of wood on each side. I just did one and it did not take much pressure in the vice to remove it and caused no damage

 

[tripple3]

The hub is not laced into a wheel, but it is complete. Any advice is welcome. Tools? Technique?

It's a lot easier when laced into a wheel.
Lace it, then swap cogs;
on the bike, with the crank.
Scott @rustjunkie posted how to do it that way.

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[fordmike65]

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[Rivnut]

Ahhh! A couple of pieces of wood. Great idea.

 

[49autocycledeluxe]

2 threads going about sprockets. suddenly I want to watch the Jetsons