On 08/22/2013 07:25 PM, William wrote:
Steve buddy
1. I would never categorize you in "most people", so you can be
totally right about your gearing choices without disproving my
assertion that most people can do just fine with a compact double. :-)
I make no comment about "most people." I've not done any sort of
quantitative comparison and have no data. Every one has their
individual gearing needs, and it pays to figure out what you need given
your body, your fitness and the terrain in which you ride.
2. This is another datapoint proving that you've been unfairly
maligned as a Jan Heine disciple. You like cantilever brakes and
triples. If you were a true Jan-zealot you'd be on centerpulls and
compact doubles. Steve learns from many, but makes up his own mind,
people!
I like centerpulls, too. One of my bikes has Mafac Raids, another has
brazed on Paul Racers. I also like dual pivot sidepulls, in the right
situation.
3. I agree that a compact double with an ultrawide cassette has big
jumps. What I meant by a "normal cassette" was more like an 11-26 or
an 11-28 with a 44/30. If you cannot possibly live without a sub 22"
gear then I agree that a triple provides better coverage. On my
touring bike I happily run a 3x8 where I need really low gears.
Regardless of the cassette in question, the "big jump" is due to the
53.8% difference between the chain rings. That insures that regardless
of the cassette, when you do a front shift you will have a big, big
difference between gears compared to a more typical 10 or 12 tooth
shift. You also have to decide how large spacing between gears is
good for you, and where in the range you like it close, vs where you
like it wider (Patrick has written extensively on his preferences here,
as has Jan; I couldn't live with either Patrick's or Jan's.)
In general I agree 300% with your approach: Pick your high gear and
your low gear and design it to cover the space with acceptable jumps,
keeping an eye peeled for chain line. Double shifts are a lot less
troublesome to me than you make it sound when my left side shifter
never has to trim. Slam it against the stop for the big ring. Slam
it against the stop for the small ring.
Trimming isn't a problem for me (as a bar end shifter user). If/when I
do it, I hardly even pay it any conscious attention. What you have to
go through to do a double shift and stay reasonably "in sequence" is
important to me. I would go mad if every time I needed a gear below 40
inches I'd have to cross over and upshift 3 or 4 at the same time, and
I'd go mad if every time I shifted to the small ring it felt like I'd
dropped the chain, or if every time I shifted from the small to the
large chain ring it dropped my RPMs by half and doubled the pedal effort.
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