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Re: compact cranks:should I
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Monoson, Ted
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May 13, 2007 12:22 PDT
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I feel a little bad going off subject here, but no too bad since it is not
completely off subject. I have another similar equipment question.
Should I put aero bars on my BMX bike? Vicki, is there some matrix you can
do on this?
-----Original Message-----
From: Will's Account <willka-@comcast.net>
To: D20 <uscf-dis-@topica.com>
Sent: Sat May 12 14:54:08 2007
Subject: Re: D20: compact cranks:should I
I liked Vicki's matrix. It shows you how you can conceivably cover
the same final drive ratio with a compact, which I believe to be the
case. Not to discount the friction aspect, as I am sure it is
relevant, but another add to the thread:
As I am told, one tooth on the cassette is "about" 4 teeth on the
chain ring. So, 53/12 is very close to 50/11. I am sure this basic
rule varies as the ring gets smaller. Until I made an upgrade
yesterday, I was running compact 50/36 x 11/23. I am not a great
climber, yet never had a problem climbing anything in northern VA.
On fast sprints and downhills, my cadence was never noticably
different then those next to me (more like in front of me) running
53/12.
Further, my upgrade has 53-39 vise the old 50/36 (3 tooth difference
on each ring for about the same gap). With a 12-27 cassette instead
of 11-23, I have gained lower options in both rings, a lower possible
final drive ratio, with the sacrifice of a slightly steeper
progression on the low half of the cassette. So, if I went to 12-25
on the upgrade, once again I would have "nearly" the same final drive
ratio, with "nearly" the same progression in the cassette.
If I am screwing up the math, someone please set me straight, but I
think I have it correct. I also think, if you have been running
bigger rings for years, you are not likely to go compact and be
happy. If you are experienced, and what you know and like works,
stick with it. If you are a new guy, like me, you will like your
compact fine, then realize you are the minority, and likely upgrade
to what the pros and cool kids are doing, because that is what makes
them pro or cool.
Will
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