Removing an el-cheapo one speed freewheel

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Dahondude
Posts: 216
Joined: Tue Jan 20, 2009 10:13 am

Removing an el-cheapo one speed freewheel

Postby Dahondude » Mon Jun 06, 2011 8:53 pm

Mate of mine got sold a bit of a lemon at a local bike shop yesterday.

Its a single speed, but built on a MTB frame so vertical dropouts. Duh!

There's a cheap one speed freewheel (20 tooth) which doesn't have the normal 4 cutouts to allow a Park Tool removal tool to unscrew it

The crankset is a MTB one (four arm, 100 mm BCD chain ring) so limited to maximum 48 tooth chainring, but currently fitted with a 42, so current gear ratio is 42/20, a paltry 2.1

We want to up the ratio significantly, so can probably accept 48 on the chain ring (otherwise looking down the barrel of replacing the entire crankset to a single-speed road crank) but need to replace the freewheel on the back with a decent Shimano 16 tooth one, thus getting a 48/16, or 3.0 ratio.

Problem is getting the current freewheel off. We've talked to a few bike shops both of who say they wont touch it as we will need to destroy the freewheel to get it off. No worries doing this, as a replacement is only $16 but how to do it? Anyone familiar with a screw on one speed freewheel that DOESNT have the four cut outs to aid removal?
Image
Schwinn Madison single speed
Trek 1500
Centurion Equaliser
Avanti MTB converted to single speed

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gclark8
Posts: 959
Joined: Sat May 14, 2011 7:09 am
Location: Bassendean, WA

Re: Removing an el-cheapo one speed freewheel

Postby gclark8 » Mon Jun 06, 2011 9:07 pm

No probs, bring it round here, I get them off ok. :wink:
Cheers,
George.

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sturmey archer
Posts: 237
Joined: Tue May 04, 2010 8:14 pm
Location: Melbourne

Re: Removing an el-cheapo one speed freewheel

Postby sturmey archer » Mon Jun 06, 2011 10:13 pm

I followed this guide using a large stilson and more force than expected...

http://www.parktool.com/blog/repair-help/freewheel-destructive-removal
1.370" x 24 tpi - what sort of stupid standard is that?

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Dahondude
Posts: 216
Joined: Tue Jan 20, 2009 10:13 am

Re: Removing an el-cheapo one speed freewheel

Postby Dahondude » Wed Jun 08, 2011 4:46 pm

Thanks! All fixed now and he even discovered the bike has an asymmetric bottom bracket so can tension the chain properly!
Image
Schwinn Madison single speed
Trek 1500
Centurion Equaliser
Avanti MTB converted to single speed

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hartleymartin
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Location: Old Toongabbie, NSW
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Re: Removing an el-cheapo one speed freewheel

Postby hartleymartin » Sat Jun 11, 2011 11:12 pm

Dahondude wrote:Thanks! All fixed now and he even discovered the bike has an asymmetric bottom bracket so can tension the chain properly!


I think you mean eccentric... rather like most of the people here. :lol:
Martin Christopher Hartley

http://raleightwenty.webs.com - the top web resource for the Raleigh Twenty
http://madmartysblog.blogspot.com - my cycling adventures

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brookts
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Location: Sydney
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Re: Removing an el-cheapo one speed freewheel

Postby brookts » Mon Jun 20, 2011 11:34 pm

A little weld drop then use a chain whip. You could then also use it as a fixed cog if desired.

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