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Discussion Starter · #1 ·
I have a 12-25 cassette (Chorus). On flats I prefer 39 x 14 or 53 x 19. The bad thing with my set up (relative to how I ride) is if I'm in 53 x 19, going up to 17 is too much of jump (nearly 2mph). Spinning in 39 x 14 is nice because 13 is a small jump (~1mph increase), but 13 is at the limit for the chainline. If I want to sprint, I'm forced to shift up to the big ring first.

I also don't want to give up 12 or 25... I guess I need a 11spd.

Is it possible to custom gear the cassette to say 12-13-14-15-17-18-19-21-23-25, thus trading 16 for 18? That would give me 3 comfortable 53t gears for solo spinning.
 

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Go to a compact crank. The 34 will knock you down the 1 tooth cog differences in the cassette. Sorry I answered with out reading the post very well cause George Carlin is on hbo. Go to one of thos gear charts, and check130mm and compact chainrings to see which cassettes will give you the gear inches and overlap between chainrings that you want. I don't think you'd like the funky jump at either side of 17-18 in normal riding.
 

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twinkles said:
Go to a compact crank.
True dat. Something like a 48-34 compact with an 11-12-13-14-15-16-17-18-19-21 'sette would likely solve his probs. 48x17 is almost exactly the same as his current 53x19 cruise gear, he's got 1-tooth jumps on either side of it (almost everywhere here, actually), the 48x11 high is very close to his current 53x12 high gear, and the 34x21 low is only a bit higher than his current low (it's a 39x24 equivalent).

Another option is same 'rings with an 11-23 'sette. You lose the 1-tooth jump on the downside of the cruising gear, but you still have all 1-tooth jumps going up from the cruise gear, and you get a considerably lower low (39x26 equivalent).
 

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naranjito
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Do you really need 53x12? It's not a great idea to change the 16 for the 18, because the jump between 15 and 17 is even greater than between 17 and 19. If you don't need the 53x12 (only really useful on a few downhill sections and if you can sprint like boonen), I would just lose the 12 and put in the 18, which is a much more useful sprocket to have than the 12.
You might not be able to use the 39x14 if the chain catches on the big ring, but 53x19 is virtually identical to 39x14, so you're not losing any usable ratios anyway. You'll just need to change up to the big ring a bit sooner.

The other way to do it would be to change the 25 for the 18. Depends if you live somewhere flat or hilly.
 

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facts....

The quick answer is that swapping cogs out of order will foul up shifting and no, you can't toss an 18T into a Chorus cassette.

What you really need is a 12-23 or 13-26 cassette which both have the 18T cog or wait until 11 speed comes out. The 12-25 will have an 18T.
 

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Discussion Starter · #6 · (Edited)
Do I need a 53x12? Not that often, BUT I do like having 39x13. If I go 13-26 I loose the ability to run in 39x13... but as you said, 53x19 and 39x14 are nearly the same ratio. It'd mean adjusting my riding habits a bit -- if I am approaching any climbs or running under 19-20 mph keep it in 39. Otherwise I'd use the big ring. The bad thing is there is no overlap so I'm forced to choose one or the other.
 

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Squirrel Hunter
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The perfect choice

C-40 said:
What you really need is a 12-23 or 13-26 cassette which both have the 18T cog
Both those have the magic cogs - Sweet 16 and Barely Legal 18.

My favorite cassette for the flats of Indiana is the 12-23. My wife likes the all purpose nature of the 13-26. Those middle cogs see far more use than anyone's 11t or 12t cog. Just to throw one more thought into your decision, think about using a 42t chainring.
 
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