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Discussion Starter · #1 ·
I have Cannondale Trail SL 29'er 5 (Single Speed version). Last year, I found the gearing a bit too easy - high cadence and no speed - so I want to drop a tooth or two in the rear cog. It's currently a 20t and I'm thinking about installing a 19t or 18t. The problem is, there's too much selection and I'm not sure what I require.

From what I can gather - my hub is a Formula DC-52 and appears to be a hybrid between a thread on type cog and spline - but I'm not 100% certain. The bike is in storage and difficult to get to at the moment, so it's not as easy as taking it apart to find out.

Does anyone have any experience with this set up and know what type of cog I should be looking to purchase?

Thanks
 

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Cut up the base of an old water bottle into a roughly cog-shaped shape with the approximate number of teeth (parts of teeth count), and you're good to go.
 

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Discussion Starter · #5 ·
asphaltdude said:
You'll need a cassette-style splined cog.

I thought that there's more than one type of standard for the splines though (Shimano and something else). Any idea what spline standard my hub would be?

I've gone to the Formula website, but I can't find anything that references this.
 

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jalbes said:
I thought that there's more than one type of standard for the splines though (Shimano and something else). Any idea what spline standard my hub would be?

I've gone to the Formula website, but I can't find anything that references this.
they're gunna be a shimano type spline
 

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I am very pleased with my HBC cog...
shamless pic whoring:

(this is the two piece version with a wide 7mm base)
 
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