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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 10-08-07, 04:41 AM   #1
Gez
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What freewheel

Hi There,

I have just purchased my first single speed bike, A specialized Langster. I'm really enjoying the bike but would like to put a lower geared freewheel on it, currently its running a 16 and I'm looking to get a 14.

could anyone give me some advise on sizing etc? I've been looking at ACS claw freewheels, are they a standard size? not finding much help on the web...


Any help would be greatly appreciated

Thanks
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Old 10-08-07, 04:57 AM   #2
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You can't get a standard threaded freewheel under 16 teeth. ACS makes 14t and 15t freewheels, but they have a smaller diameter and won't fit on a standard hub. However, you said you want a "lower geared freewheel". A lower gear would actually require a freewheel with more teeth than you have now, not less.
Just about any freewheel with 16 or more teeth will fit on your hub.
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Old 10-08-07, 05:17 AM   #3
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Thanks for the quick reply, sorry should have said Higher geared, I.E i want it to be harder to pedal.

Thanks
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Old 10-08-07, 05:22 AM   #4
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If you want to go higher geared and you already have the smallest freewheel available for your hub (16t), the solution would be to get a larger chainring. Whats your current gear ratio?
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Old 10-08-07, 05:31 AM   #5
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The chainring is a 42 Synigo Messenger
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Old 10-08-07, 05:37 AM   #6
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ACS used to make a 15t freewheel for standard threads but no more, I think.
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Old 10-08-07, 05:39 AM   #7
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Given your present setup, adding six teeth to your chainring will be equivalent to loosing two teeth from your freewheel. With a 48/16 ratio, you should be able to pedal comfortably at 25mph and maybe even a little higher than that.

Last edited by mihlbach; 10-08-07 at 05:44 AM.
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Old 10-08-07, 05:41 AM   #8
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Quote:
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ACS used to make a 15t freewheel for standard threads but no more, I think.
It wasn't ACS....it was AC Racing. And yes, they no more.
http://sheldonbrown.com/harris/singlespeed.html
Scroll down a bit and you'll see it.
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Old 10-08-07, 07:26 AM   #9
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That great thanks, looks like the chainring is the way to go then, any recomendations? currentlly the only details i can see on teh chainring point to it havifn a PCD130mm

cheers
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Old 10-08-07, 07:45 AM   #10
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get a 48T chainring. The gear ratio will be similar to a 42:14
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Old 10-08-07, 08:31 AM   #11
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PCD is what you'll need to know cuz there are different ones....just get one with the same PCD 130
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Old 10-08-07, 08:57 AM   #12
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That great thanks, looks like the chainring is the way to go then, any recomendations? currentlly the only details i can see on teh chainring point to it havifn a PCD130mm

cheers
If you don't want to spend a lot of money, get a Rocket Ring...cheap and works fine.
There are more expensive options.
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Old 10-08-07, 09:01 AM   #13
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PCD is what you'll need to know cuz there are different ones....just get one with the same PCD 130
It's BCD.
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Old 10-08-07, 09:11 AM   #14
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If you don't want to spend a lot of money, get a Rocket Ring...cheap and works fine.
There are more expensive options.
yeah, go rocket if you're on a budget. other rings are mostly nicer looking, once you get further up in price they'll be lighter, all that sort of racing type stuff, but for riding around town, a rocket ring oughta do you.
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Old 10-08-07, 09:16 AM   #15
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oh, i'd also suggest getting new chainring bolts and hunting around for some suntour bmx bolts. you don't have to use the stupid spanner on back for these, you can use a 13mm box wrench or a 6mm hex on back, and a 5mm hex in front. i love it.
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Old 10-08-07, 10:05 AM   #16
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it should be noted that a bigger chainring will require a new chain (longer).
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Old 10-08-07, 10:23 AM   #17
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It's BCD.
Dear god, thank you. When I saw that repeated, all I could think was "So this is how morons get started on the wrong track... 'no dude, it's PCD, I saw in repeated on an internet forum like 1000 times...'"

Bolt Circle Diameter
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Old 10-08-07, 02:05 PM   #18
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Thanks for all the replies, New chaniring and chain ordered.

Cheers
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Old 10-08-07, 03:21 PM   #19
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It wasn't ACS....it was AC Racing.
Thanks for the correction.
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Old 10-09-07, 05:25 AM   #20
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Dear god, thank you. When I saw that repeated, all I could think was "So this is how morons get started on the wrong track... 'no dude, it's PCD, I saw in repeated on an internet forum like 1000 times...'"

Bolt Circle Diameter
Hope i ordered the right thing the Chanring Deffinatly says PCD so wonder if its refering to somethign else?
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Old 10-09-07, 05:41 AM   #21
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Thanks for all the replies, New chaniring and chain ordered.

Cheers
Save the excess chain after you shorten it to the desired length. You never know when you'll
need it.
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Old 10-09-07, 08:00 AM   #22
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Hope i ordered the right thing the Chanring Deffinatly says PCD so wonder if its refering to somethign else?
I saw it described as Pitch Circle Diameter about 5 years before I first saw it described as Bolt Circle Diameter.
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