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Discussion Starter · #1 ·
Any word, hint, or whisper of a cassette ending with 21-23-25-27?
My 6600 shifters have been in service since the earth cooled. I'm considering replacing them with 6700, but a 12-27 11sp cassette would have me move to 11sp.
 

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Sram makes a 12-26 that gets pretty close to that gearing
 

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It's a bit confusing if you want a 10 speed or an 11 speed cassette. However the 6700 shifters you mentioned are for 10 speed. Shimano has a 12-27 10 speed cassette (105 series) and so does SRAM which will work properly with your Shimano 10 speed system.

Shimano 6800 series is for 11 speed. They do not have a 12-27 cassette in the series to offer.

Anyway if you go to Universal Cycles on-line and look at their cassette offerings you will find everything available in the listings. They also break each cassette down to the individual cogs for you to think about or purchase.
 

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If you are changing to 11 speed, 6800 comes in 11-23, 11-25,11-28,12-25, and 14-28.
 

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Discussion Starter · #7 ·
It's a bit confusing if you want a 10 speed or an 11 speed cassette. However the 6700 shifters you mentioned are for 10 speed. Shimano has a 12-27 10 speed cassette (105 series) and so does SRAM which will work properly with your Shimano 10 speed system.

Shimano 6800 series is for 11 speed. They do not have a 12-27 cassette in the series to offer.

Anyway if you go to Universal Cycles on-line and look at their cassette offerings you will find everything available in the listings. They also break each cassette down to the individual cogs for you to think about or purchase.
I'm asking about any rumor of a shimano 11sp cassette ending with 21-23-25-27.
 

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Campagnolo 11-speed cassettes are compatible with Shimano shifters. The spacing between cogs is essentially the same on both. (I did have the chain come off the 12 cog when using my 12-25 on my Ultegra bike. But I haven't been able to reproduce the derail, even when trying things like fast shifts and front & back shifts at the same time.)

You would need a new freehub body to fit the Campagnolo splines. And the cassettes are quite expensive (Chorus 11 is the "low" end 11-speed cassette.)

Campagnolo makes a 12-27:
12-13-14-15-16-17-19-21-23-25-27
And a nice 12-29:
12-13-14-15-16-17-19-21-23-26-29

~~~~~~~~~~~~
Cadence changes per shift:

19 to 21: 10.5% difference
21 to 23: 9.5%
23 to 25: 8.7%
25 to 27: 8.0%
25 to 28:12.0%
That extra change, from 8% to 12%, isn't unreasonable for the largest cog, and not that much different than the 19 to 21 shift.

23 to 26: 13.0%
26 to 29: 11.5%

~~~~~~~~~~~~~~~~

I'll mention that Sram 11-28 is different than Shimano 11-28.

Compared to Shimano, the Sram has closer shifts in the 20-25 mph range, and bigger jumps in the 15-20 mph range.
11 12 13 14 15 16 17 19 22 25 28 Sram
11 12 13 14 15 17 19 21 23 25 28 Shimano.

I always thought that the 11 cog was just "marketing". But it does have one advantage: The cross chained 34-12 is usable, and can get you up past 20 mph without having to shift to the 50 chainring.
 

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Discussion Starter · #9 ·
Campagnolo 11-speed cassettes are compatible with Shimano shifters. The spacing between cogs is essentially the same on both. (I did have the chain come off the 12 cog when using my 12-25 on my Ultegra bike. But I haven't been able to reproduce the derail, even when trying things like fast shifts and front & back shifts at the same time.)

You would need a new freehub body to fit the Campagnolo splines. And the cassettes are quite expensive (Chorus 11 is the "low" end 11-speed cassette.)

Campagnolo makes a 12-27:
12-13-14-15-16-17-19-21-23-25-27
And a nice 12-29:
12-13-14-15-16-17-19-21-23-26-29

~~~~~~~~~~~~
Cadence changes per shift:

19 to 21: 10.5% difference
21 to 23: 9.5%
23 to 25: 8.7%
25 to 27: 8.0%
25 to 28:12.0%
That extra change, from 8% to 12%, isn't unreasonable for the largest cog, and not that much different than the 19 to 21 shift.

23 to 26: 13.0%
26 to 29: 11.5%

~~~~~~~~~~~~~~~~

I'll mention that Sram 11-28 is different than Shimano 11-28.

Compared to Shimano, the Sram has closer shifts in the 20-25 mph range, and bigger jumps in the 15-20 mph range.
11 12 13 14 15 16 17 19 22 25 28 Sram
11 12 13 14 15 17 19 21 23 25 28 Shimano.

I always thought that the 11 cog was just "marketing". But it does have one advantage: The cross chained 34-12 is usable, and can get you up past 20 mph without having to shift to the 50 chainring.
That's interesting stuff, thanks.

If I go 11sp I'd have the campy option - I wouldn't mix and match drivetrain components.
 
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