Does the Dura Ace 56T time trial chainring have to be matched with a similar small chainring or can
it be used with a standard 42 or 39 chainring?
Triathlon · Public discussion
56T chainring
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- Triathlon
- Published
- 22 April 2003
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- 24 April 2003
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- Jim Quinn
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Shimano and every bike shop says it can't/shouldn't be done. I have a
39/56 on my Cervelo. Looked for a 42 or 44 but don't want to pay full retail for one. Mine shifts
very well up, but sometimes downshifting it doesn't engage completely for a 1/4 to 1/2
revolution.TriRod IMC 2002 IMUSA CdA 2003
Jim Quinn said:
Does the Dura Ace 56T time trial chainring have to be matched with a similar small chainring or
can it be used with a standard 42 or 39 chainring? -
How many watts would it take to push a 56 x 12 at 100RPM on the flats into a null wind for a 160-170
lbs rider? For a 700cc wheel what speed would that work out to?Rod Richeson wrote in message <[email hidden]>...
Quoted message said:
Shimano and every bike shop says it can't/shouldn't be done. I have a
39/56 on my Cervelo. Looked for a 42 or 44 but don't want to pay full retail for one. Mine shifts
very well up, but sometimes downshifting it doesn't engage completely for a 1/4 to 1/2
revolution.TriRod IMC 2002 IMUSA CdA 2003
Jim Quinn said:
Does the Dura Ace 56T time trial chainring have to be matched with a
similarQuoted message said:
Quoted message said:
small chainring or can it be used with a standard 42 or 39 chainring?
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BillX said:
How many watts would it take to push a 56 x 12 at 100RPM on the flats into a null wind for a
160-170 lbs rider? For a 700cc wheel what speed would that work out to?Lots. That's probably why he's asking about the 39T small chainring option.
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"BillX" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
How many watts would it take to push a 56 x 12 at 100RPM on the flats into
aQuoted message said:
null wind for a 160-170 lbs rider? For a 700cc wheel what speed would
thatQuoted message said:
work out to?
Why do you assume that the original poster will be pairing that 56 tooth chainring with a 12 tooth
cog? For that matter, why do you assume that they wish to pedal at 100 rpm?Andy ("55 x 12 at 78 rpm = 300 W and 28 mph"😉 Coggan
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Most road cyclists find a cadence of 90-110 rpm on the flats to be optimal although there are some
like yourself who find a lower cadence like 80 rpm to be more effective. I'd assumed that someone
wouldn't use a 56x12 on the flats unless they could push 90 rpm or better in that gear.Andy Coggan wrote in message
Quoted message said:
"BillX" <[email hidden]> wrote in message "]news:[email hidden]...
Quoted message said:
How many watts would it take to push a 56 x 12 at 100RPM on the flats
intoQuoted message said:
a
Quoted message said:
null wind for a 160-170 lbs rider? For a 700cc wheel what speed would
thatQuoted message said:
work out to?
Why do you assume that the original poster will be pairing that 56 tooth chainring with a 12 tooth
cog? For that matter, why do you assume that they wish to pedal at 100 rpm?Andy ("55 x 12 at 78 rpm = 300 W and 28 mph"😉 Coggan
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