On 02/28/2004 04:57 AM, in article _m%%
[email protected],
"Bruce Frech" <
[email protected]> wrote:
> It depends on your riding style and on the kind of hills you have. If you don't mind medium size
> jumps in gearing such that a 2 tooth jump in the middle of the range is fine then you would like
> the 12-27 cluster. Here's the cogs numbers and the ratios ( =ln(Ci/Ci-1) ):
>
> 12 13 8.0% 14 7.4% 15 6.9% 17 12.5% 19 11.1% 21 10.0% 24 13.4% 27 11.8%
Someone is thinking Shimano instead of Campagnolo.
With Campy 10, you've got the following cassette options for low-ish gearing: 12-25, 13-26, & 13-29
12-13-14-15-16-17-19-21-23-25 13-14-15-16-17-18-19-21-23-26 13-14-15-16-17-19-21-23-26-29
These produce the following ratio increases:
12 13 13 13 8.00% 14 7.41% 14 7.41% 14 7.41% 15 6.90% 15 6.90% 15 6.90% 16 6.45% 16 6.45% 16 6.45%
17 6.06% 17 6.06% 17 6.06% 18 5.72% 19 11.12% 19 11.12% 19 5.41% 21 10.01% 21 10.01% 21 10.01% 23
9.10% 23 9.10% 23 9.10% 26 12.26% 25 8.34% 26 12.26% 29 10.92%
> Combine that with the double and you get a nice low gear of 34-27. I use a 50-38 with the 12-27.
> But it also means I don't have a 16, and have a 12% jump in a range where most of the shifting
> occurs. Some people need that magic 16, while others prefer a bigger jump there. It fits my style
> of being comfortable with a wider range of cadence, and it fits the shorter uneven hills around
> eastern PA. Plus with the common 10% grades and the less common but still frequent 1-200 meter
> long 15+% grades it's nice to have a lower gear than a 39-23.
One of the nice things about Campy 10 is that you ALWAYS have that 16 available, but not always the
18 (another common "wished-for" cog).
> But there are situations where that 16 would be nice to have. Cruising along at 22.5 mph equals
> 90rpm in the 50-16, but without the magic you must choose between 85 in the 15 or 95 in the 17.
>
> So if you do lots of groups rides @ 22.5 mph then make sure you have a 16. Otherwise stick with a
> double. Or get a 10speed........... (or Campy, and live with a 13-29, but then you don't have the
> 12... compromise....choice....)
>
> Bruce
>
> "froteur" <
[email protected]> wrote in message
>
news:hLX%[email protected]...
>> I live in the San Francisco East Bay where it is very hilly.
>>
>> I have just ordered a new bike frame that should arrive next week. In the meantime, I need to
>> decide on my crankset. I am installing a 2003 Campy Chorus Triple Gruppo and am considering using
>> the FSA Pro Elite Compact crankset (50/34) instead of the Chorus triple (52/42/30?). I am looking
>> for other members' experiences and recommendations regarding compact vs. triple.
>>
>> Also, what cassette gear ranges have you found most succesful with your own set-up?
>>
>> Thanks
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