rbent Forum - Ginormous rear cassette

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Posts: 208

Ginormous rear cassette
Oct 5^th, 2016, 10:23pm

I just got back from a TDY assignment in Utah, and I poked around in some bike shops there. In a couple of them I saw 12 speed cassettes that went from 50 teeth down to 10 teeth. A massive looking thing. It seems to be where they're headed with mountain bikes. Anybody tried one of these on a bent?

for the MTB guys there are a couple of benefits. Just one chain ring on the front, so they have simple indexed shifting only, no tuning a fd while hurtling down a trail, and of course a weight savings. Only one chain ring on the front, which means no front derailleur, cable, or shifter. Looks like this would give you not quite, but almost the same gear range as you get with a 9 speed double chainring setup. I need all three of my chainrings, so it isn't for me....but if I had a bike with only two chainrings up front and it didn't have quite enough range to take care of my hill climbing needs and my high speed needs, this might be the way to get that extra little bit without having to convert to a triple crankset...

This sounds like a project for Jay! Smiley

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P38
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jayg

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Posts: 4127

Re: Ginormous rear cassette
Reply #1 - Oct 6^th, 2016, 7:27pm

Quote from Tiger_Mike on Oct 5^th, 2016, 10:23pm:

I just got back from a TDY assignment in Utah, and I poked around in some bike shops there. In a couple of them I saw 12 speed cassettes that went from 50 teeth down to 10 teeth. A massive looking thing. It seems to be where they're headed with mountain bikes. Anybody tried one of these on a bent?

for the MTB guys there are a couple of benefits. Just one chain ring on the front, so they have simple indexed shifting only, no tuning a fd while hurtling down a trail, and of course a weight savings. Only one chain ring on the front, which means no front derailleur, cable, or shifter. Looks like this would give you not quite, but almost the same gear range as you get with a 9 speed double chainring setup. I need all three of my chainrings, so it isn't for me....but if I had a bike with only two chainrings up front and it didn't have quite enough range to take care of my hill climbing needs and my high speed needs, this might be the way to get that extra little bit without having to convert to a triple crankset...

This sounds like a project for Jay! Smiley

Loan (or, preferably, give) me $1,363, and I'll convert one of my recumbent's drive train to SRAM 12 speed, try it out, and report back to you. Cheesy

Did you know that Shimano has one-upped SRAM by developing a 14-speed, single-chainring drivetrain w/54T cassette? See: http://factoryjackson.com/2016/04/01/shimano-14-speed-xt-samurai-unveiled/ (Be sure to read the article all the way to its end). Cheesy

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Action Lad

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Posts: 1570

Re: Ginormous rear cassette
Reply #2 - Dec 4^th, 2016, 5:59pm

Quote from jayg on Oct 6^th, 2016, 7:27pm:

Did you know that Shimano has one-upped SRAM by developing a 14-speed, single-chainring drivetrain w/54T cassette? See: http://factoryjackson.com/2016/04/01/shimano-14-speed-xt-samurai-unveiled/ (Be sure to read the article all the way to its end). Cheesy

Brings to mind the ever-growing number of blades on today's razors. When will it ever stop? Bill Cosby's take: "Zip zop, see that? My face is ripped to shreds!" Grin

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"You can't see paradise if you don't pedal!"
T.J. Fowler -- Chicken Run

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