11/23 cassette vs 12/25 cassette
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bluebirdbiker posted 2 years ago.
PoC put it very well here:
http://www.trifuel.com/forums/showpost.php?p=37287&postcount=2
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TBRAVO posted 2 years ago.
Sheldon Brown has a great gear ratio tool..here's the link:
http://www.sheldonbrown.com/gears/
FYI with a 700x23 Wheel and 175MM cranks @ 90 RPM here is the comparison:
53/12 = 31.1 MPH
53/11 = 33.9 MPH
Nothing wrong with having a few different cassettes. I regularly swap between an 11/23 and a 12/26 (normal 53/39 crank).
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Atropos posted 2 years ago.
Thanks for the info!
[URL="http://lincolnp.blogspot.com"]Sprinting to Ironman
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glbrum posted 2 years ago.
Yes, there is a big difference between the 11 and the 12 cog. I would suggest not trying to spin out going down hill. You can go faster with no energy expenditure at all if you tuck. ALl you do it grab the base bar (like you were going to be braking) and drop your head right behind your arm rests. You will go just as fast (if not faster) than you would trying to pedal downhill.
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Jeyradan posted 2 years ago.
Also bear in mind wheel size.
For instance, I ride a 53/39 up front and an 11/23 in the back. However, I have 650c wheels, which basically makes my 11-tooth cog give me the same effective gear ratio as a 12-tooth cog on a 700c wheelset.
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Anyone know how big of a difference there is between these two as far as effort and speed go?
I've got a 105 12/25 cassette on my Trek 1200 right now, but there are some pretty cheap Ultegra cassettes available on ebay and I was thinking of upgrading. On flats I can be in the hardest gear at about 75 RPM, but once I start going downhill I usually can't pedal fast enough to improve my speed. Having access to a slightly higher gear might be nice for some good low-cadence power training.
So, basically my question is: is there a significant difference in feel between that 11 tooth gear and the 12?
[URL="http://lincolnp.blogspot.com"]Sprinting to Ironman
The breakdown that happens at the seven-hour mark often starts 200 meters off the beach
--Gordo