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Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

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Old 09-16-09, 02:40 PM   #1
ScarcelyAware
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Why don't rear cassettes go below 11?

...or do they?
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Old 09-16-09, 02:41 PM   #2
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Capreo 9-26.

Trike riders often use them.
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Old 09-16-09, 02:43 PM   #3
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Are you spinning out of an 11?
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Old 09-16-09, 02:44 PM   #4
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Why would it go below 11?

The smaller you get, the more the chain has to bend, and the more the chain bends, the less efficient it gets. There is also a point where your chain links have to get shorter or it can't physically make the bend.
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Old 09-16-09, 02:45 PM   #5
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If you have a Marshall Stack, that's far enough.

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Old 09-16-09, 02:51 PM   #6
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Get a bigger ring up front ?
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Old 09-16-09, 02:51 PM   #7
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Originally Posted by banerjek View Post
Capreo 9-26.

Trike riders often use them.


Good description here:

http://www.sheldonbrown.com/capreo/index.html
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Old 09-16-09, 02:53 PM   #8
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Thanks.

No, I'm not spinning out of 11. I was curious, that's all. :]
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Old 09-16-09, 02:54 PM   #9
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I think an 11 tooth cog is the smallest you can reasonably design for use on a standard freehub body. The Caprio looks like it uses a special freehub body that isn't compatible with standard cassettes.
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Old 09-16-09, 02:55 PM   #10
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The Spinal Tap Accord of 1987 forbade going below 11.
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Old 09-16-09, 02:56 PM   #11
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Thanks.

No, I'm not spinning out of 11. I was curious, that's all. :]
Nothing wrong with curiosity ... just keep it away from me.
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Old 09-16-09, 02:57 PM   #12
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Are you spinning out of an 11?
I sometimes spin out of an 11 when I'm angry. But you'll see me coming thanks to the green complexion and ruined pants.

Oh and you won't like me when I'm angry!
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Old 09-16-09, 03:10 PM   #13
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Why would it go below 11?

The smaller you get, the more the chain has to bend, and the more the chain bends, the less efficient it gets. There is also a point where your chain links have to get shorter or it can't physically make the bend.
The Capreo can be found on folders as well as trikes.

The reason is that you have a 20" wheel (some wheels are even smaller). Even with a 60T front ring, you'd only get 110 g.i with an 11-23 and you'd have significantly less if you run a 55T or smaller. In other words, the gear ratios aren't as insane as they sound. If you run standard chainrings, you have lower gears than you do on a regular road bike.

Besides, having cogs 1 tooth apart in the normal ranges for road bikes just doesn't make sense if you have small wheels. A 9/26 has plenty of range -- I can take a velomobile up a 15% grade with a 26T because the rear wheel lowers my already weenie gearing.
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Old 09-16-09, 03:52 PM   #14
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Another way to overcome the lack of gears on a recumbent is to use a Schlumpf High speed drive. It has a 27T chainring that once you tap the shift button in the middle of the crank arm, it switches to 2.5X overdrive giving you a 67.5 tooth front ring. Pushing 130 GI on a trike is super hard work for me, and it tires my knees very badly.
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Old 09-16-09, 06:21 PM   #15
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And here I'd like something like a 13-29 Shimano-compatible, like the one Campy has, to run with a standard crankset until I get stronger
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Old 09-16-09, 06:24 PM   #16
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Wear on the cogs also increase with fewer teeth. And I don't like the big jump between a 11->12t cog. I prefer a 13->14t jump for closer ratios. Personally, I'd like a 13-26t straight-block.
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Old 09-16-09, 09:51 PM   #17
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Wear on the cogs also increase with fewer teeth. And I don't like the big jump between a 11->12t cog. I prefer a 13->14t jump for closer ratios. Personally, I'd like a 13-26t straight-block.
Yup. I've got the capreo cassette on my folder and I know this to be true.
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Old 09-16-09, 11:22 PM   #18
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Originally Posted by Brian Ratliff View Post
I think an 11 tooth cog is the smallest you can reasonably design for use on a standard freehub body. The Caprio looks like it uses a special freehub body that isn't compatible with standard cassettes.
This. If you take a look at an 11t cog on your freehub, you'll see that there's basically only the space for the tooth, the space for the metal ring, and the hole for the the freehub... other gears get more space between the tooth and the freehub body, but they simply ran out to make a smaller cog. That's why the capreo has a smaller end to the freehub than a traditional one does.
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Old 09-17-09, 09:05 AM   #19
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The Spinal Tap Accord of 1987 forbade going below 11.
Don't forget that 11 is louder.
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