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 Post subject: fixed gear qu...sorry
PostPosted: Sat Jan 02, 2010 10:41 pm 
Dirt Disciple

Joined: Sun Feb 15, 2009 11:22 pm
Posts: 85
i have a 20" wheel shopper that i want to go fixed with...

im thinking of slotting in bmx wheels or single speed kids mtb wheels

i know if i was using a rear wheel off a geared donor bike i could fit spacers,fixed cog and a lock ring with loctite

but the qu is....

can a single speed bmx wheel have a fixed cog screwed on as a replacement and that's it...or does it still need a lock ring?..is there room for a lock ring on this wheel?

cheers chaps...


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 Post subject:
PostPosted: Sat Jan 02, 2010 11:02 pm 
Retro Guru
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Joined: Thu Aug 06, 2009 5:48 pm
Posts: 868
It still needs a lockring. Don't know about room, what BMX wheels are you thinking of using? I'm guessing some old ones since decent modern ones all have cassette hubs?


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 Post subject:
PostPosted: Sat Jan 02, 2010 11:18 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Fri Oct 10, 2008 8:44 pm
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Location: Wherever it is, I'm being just that little bit more Lance
As is so often the case, your best friend is Sheldon Brown. Take a gander here, towards the bottom he has pics and details of his Raleigh 20 fixed gear folder. Take a surf around the site, he gives chapter and verse on 'how to fixed gear'.

http://sheldonbrown.com/raleigh-twenty.html

The guy was and will always be a legend.

EDIT: If you're not using it for hard core riding, a lockring off a cup and cone bottom bracket is the same thread :wink:

Just remember the loctite and don't back pedal.


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 Post subject:
PostPosted: Sun Jan 03, 2010 12:25 am 
Dirt Disciple

Joined: Sun Feb 15, 2009 11:22 pm
Posts: 85
bmx wheels may be a tad wide...from what i'm readin..not sure tho

so was thinkin of maybe a rear wheel from a single speed kids bike as a donor like an apollo xc20 or something

i do want to pedal backwards... :wink:

will have to read up on cassette hubs

if i have to i have a welder... :D

yeah i'm familiar with sheldon brown...he says one speeds are easy to fix ?


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 Post subject:
PostPosted: Sun Jan 03, 2010 1:25 am 
Gold Trader
Gold Trader

Joined: Sun Jun 22, 2008 1:38 pm
Posts: 1439
Location: OZ
BMX spacing is 110mm

If your bike had a hub gear then spacing is 113mm

so should be fine

Andy


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 Post subject:
PostPosted: Sun Jan 03, 2010 8:39 am 
Dirt Disciple

Joined: Sun Feb 15, 2009 11:22 pm
Posts: 85
ok cheers guys..

yep, is hub...think the width issue is more at front end...

cheers for sheldon link..couple of items not seen before...

so my thoughts are...

a budget kids bike single speed will have a freewheel hub?...so will replace it with a halo fixed cog for 15 quid. BB lockring i have, loctite i will get and will look for back wheel in the tip.....

so for 20 quid i could have a usable fixie....possibly


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 Post subject:
PostPosted: Sun Jan 03, 2010 9:12 am 
Gold Trader
Gold Trader

Joined: Sun Jun 22, 2008 1:38 pm
Posts: 1439
Location: OZ
You should be able to get a cheap fixie cog for a fiver at your LBS. will be good enough for what you're doing.

The front hub width is most likely 90mm- you can use a standard hub if you remove the cone locknuts and adjust the cones once the wheel is in the fork.
or just get a bit of pipe and bend em out :-)

Andy


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 Post subject:
PostPosted: Sun Jan 03, 2010 9:55 am 
Dirt Disciple

Joined: Sun Feb 15, 2009 11:22 pm
Posts: 85
yeah riding fixed on a shopper wont be like ridin fixed on a racer..its to commute a short distance and go to the shops on

but wanna look cool doin it..lol

so a cheap cog a bit of loctite and BB ring should be sufficient.....will have a front brake of course...

might be able to get hold of a wider alloy wheel coaster set up now though....which means i could use bike with two options...cool

and still use SA when i fancy it...so 3 bikes in 1... :D


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 Post subject:
PostPosted: Sun Jan 03, 2010 12:13 pm 
retrobike rider / Gold Trader
retrobike rider / Gold Trader
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Joined: Fri Oct 10, 2008 8:44 pm
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Location: Wherever it is, I'm being just that little bit more Lance
There is an article on sheldon Brown about converting the good old Sturmey Archer 3 speed hubs into 2 speed fix gear hubs, now that would be fun!


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 Post subject:
PostPosted: Mon Jan 04, 2010 12:57 am 
Dirt Disciple

Joined: Sun Feb 15, 2009 11:22 pm
Posts: 85
that sounds good..will read that, not seen it yet....fancy doing that to an old frame with a spare SA..sounds fun... :D


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