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10 speed derailuer help

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10 speed derailuer help

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Old 05-08-18, 06:27 AM
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bent4me
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10 speed derailuer help

I'm looking to upgrade my Xootr Swift to a Sram 10 speed. It currently has a 44t chainring. I would like more than 11/36 cassette but need to keep cage as short as possible due to 20 inch wheels. What is the largest cassette that will work with what I assume would be a medium cage?
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Old 05-08-18, 08:11 AM
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36t is the practical linit for medium cage derailleurs. I have 42t with this SRAM mech on a big-wheel bike; it doesn't look excessively long to my eye, I think it would be ok on a Swift.

https://www.sram.com/sram/road/products/sram-force-1-rear-derailleur
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Old 05-08-18, 11:16 AM
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consider a hybrid rear hub Sram dropped that sector

finding the one by 12 trend, more lucrative a market.

so that leaves S-A, then you use the 0.75:1 reduction gear in the internal gear hub part to make your gear lower
although the actual low gear cog is not that large* .. and so within the capacity of a short cage RD.
Because of the epicyclic internal gear, the cassette driver will rotate faster than the hubshell ..

In the overdrive gear the inverse happens.. 1.33: 1 .. 4/3 instead if 3/4.

* 75% of 36 is 27, so there you go...




...

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Old 05-08-18, 06:04 PM
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Abu Mahendra
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Originally Posted by bent4me View Post
I'm looking to upgrade my Xootr Swift to a Sram 10 speed. It currently has a 44t chainring. I would like more than 11/36 cassette but need to keep cage as short as possible due to 20 inch wheels. What is the largest cassette that will work with what I assume would be a medium cage?
I have seen the stubby Shimano Zee RD hacked to accomodate a 42T cog. Look into that.
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