12-27 vs 12-25

On 24 Jul 2003 17:58:42 GMT, (Mike Krueger) wrote:

For this to work, you'll also need a diferent (larger diameter) lockring and 12
or 13T first position cog, which is knurled to mate with the lockring.

The 12 on an 11/12 is actually an end cog with integral spacer.

On Thu, 24 Jul 2003 12:54:06 +0000, Bill Davidson wrote:

Michael wrote:
I went to 12-27 Ultegra a few years ago for the extra gear (actually I
went from 8 speed Ultegra 12-23 or 24 to 9 speed Dura Ace 12-27). I
have no shifting issues at all. I can crank the 12 to 35 mph downhill;
I can't imagine needing an 11.

How about if your largest front cog is a 46?

Mine is, and a 46/12 is quite big enough for anyone who isn't racing.

--

David L. Johnson

__o | The lottery is a tax on those who fail to understand
_`\(,_ | mathematics.
(_)/ (_) |

Mine is, and a 46/12 is quite big enough for anyone who isn't racing.

Mine is 48. 48/12 fits me well.
B

(remove clothes to reply)

On Thu, 24 Jul 2003 09:23:38 -0400, dorn wrote:

12-27 shifts perfect and it gives you a bailout gear, plus unless you are
pretty strong its not that often you need more than a 12.

Agreed, 12-27 shifts fine on my 2001 105 double rear derailleur. I'd have
liked an 11-27, but I don't think it was available. Around here, there's
lots of [sometimes short] hills where it's easy enough, even with weak
wimpy legs like mine, to use up all my gears and spin up pretty fast, past
my most efficient cadence.

Close-ratio road gears are great for strong, well trained cyclists, but I
could really use a wider total range, myself. Should've bought the
triple...

Chris
--
Rick Onanian

On Thu, 24 Jul 2003 20:54:05 -0400, Rick Onanian
wrote:

liked an 11-27, but I don't think it was available.

11,12,13,14,16,18,21,24,28 A loose cog 11/32 cassette with a 13t or
preferrable 12,13 from another cassette. I put one together for a
650c wheel and 50/40 crankset.

Here we go with this again. You've got it exactly backwards -
it is precisely because non-racers are not racers that they need
a taller gear.

Doug


"David L. Johnson" wrote in message ...
On Thu, 24 Jul 2003 12:54:06 +0000, Bill Davidson wrote:

Michael wrote:
I went to 12-27 Ultegra a few years ago for the extra gear (actually I
went from 8 speed Ultegra 12-23 or 24 to 9 speed Dura Ace 12-27). I
have no shifting issues at all. I can crank the 12 to 35 mph downhill;
I can't imagine needing an 11.

How about if your largest front cog is a 46?

Mine is, and a 46/12 is quite big enough for anyone who isn't racing.

belij3- Mine is 48. 48/12 fits me well. BRBR

50/13 for me...plenty tall, never 'spin out', even downhill...

Peter Chisholm
Vecchio's Bicicletteria
1833 Pearl St.
Boulder, CO, 80302
(303)440-3535
http://www.vecchios.com
"Ruote convenzionali costruite eccezionalmente bene"

50/13 for me...plenty tall, never 'spin out', even downhill...

So ........ a 46/12 should do the same?
B

(remove clothes to reply)

David L. Johnson wrote:
That's my top end. When I was racing, in the early '70s, most riders' top
gear was a 52/14, which is about the same ratio. Though probably not
enough for a downhill sprint, or a professional pack on a flat road, most
of us will never see those, and the utility of a 53/11 or similar huge
gears is minimal.

I agree that a 53/11 is a little silly for most riders.

I don't think a 46/11 is rediculous for downhilling. It's only a little
bigger than a 48/12. It's still under 40 mph at 120 rpm and under 33 mph
at 100 rpm.

Not everybody likes to coast down the hills and many people's large
chainring is limited by their small chainring and deraileur capacity.

What about a 42/11? At what point does an 11 become acceptable?

For the record, my top gear is a 48/13 and I do spin out on several hills
around here. I'm not sure what my top rpm's are but based upon Sheldon's
calculator, it's over 120 rpm.

--Bill Davidson
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Bill Davidson wrote:


At what point does an 11 become acceptable?

When you decide you want it. It's your bike, do what you will with it.