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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 04-22-10, 11:10 AM   #1
jaimo
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Flip flop question

Hey,

I am running a single speed on a flip flop hub and would like to give fixed a go. The ss is 16t and the fixed cog is 14t. My problem is when I flip over to the fixed cog the chain tension seems to be a bit loose. Do I need get a fixed cog that is closer in size to the ss?

Thanks
James
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Old 04-22-10, 11:17 AM   #2
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What do your dropouts look like?
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Old 04-22-10, 04:41 PM   #3
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Same chain length but different cog size will mess up your chain tension...two teeth = 2 links = an inch difference.
I'd definitely get a 15t to match your 16t a bit closer.
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Old 04-24-10, 12:26 PM   #4
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Thanks, the drop outs are horizontal but with the freewheel the wheel is pushed all the way back so would not be able to move it further back with the fixed cog. Will give a larger fixed cog a try.
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Old 04-24-10, 05:53 PM   #5
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You can fix the chain and move the wheels closer OR you can use a chain tensioner, both of which is cheaper and less wasteful than getting a new cog =)
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Old 04-24-10, 06:01 PM   #6
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If you put the same size cog on the other side you can eliminate the problem entirely.

Do people seriously need to be told to remove a chainlink here?
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Old 04-24-10, 06:10 PM   #7
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Originally Posted by Vixtor View Post
Same chain length but different cog size will mess up your chain tension...two teeth = 2 links = an inch difference.
I'd definitely get a 15t to match your 16t a bit closer.
it's more like half an inch, since not all teeth of the cog and chainring are engaged at once. More or less half of the teeth in the cogs are engaged.

It might be possible to make a chain that fits both cogs by using a half link chain.
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Old 04-24-10, 06:28 PM   #8
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Originally Posted by Six jours View Post
If you put the same size cog on the other side you can eliminate the problem entirely.

Do people seriously need to be told to remove a chainlink here?

Yes, they do.

REMOVE A LINK IN YOUR CHAIN

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Old 04-24-10, 06:45 PM   #9
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Originally Posted by jaimo View Post
Thanks, the drop outs are horizontal but with the freewheel the wheel is pushed all the way back so would not be able to move it further back with the fixed cog. Will give a larger fixed cog a try.
If the slots are long enough, take a link out of the chain to move the cog forward enough so that you don't run out of slot when you use the smaller cog. The closer in size the cogs are, the less of an issue this is, but most horizontal track dropouts are long enough to accommodate a 2-tooth size difference without a problem.
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Old 04-24-10, 09:40 PM   #10
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If the slots are long enough, take a link out of the chain to move the cog forward enough so that you don't run out of slot when you use the smaller cog.
Huh. I wouldn't have figure that one.
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Old 04-25-10, 08:24 AM   #11
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Thanks everyone, I'll remove a link, to move up the wheel when using the freewheel and move the wheel back into the dropouts when using it fixed.
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