12-25 and 12-27 9spd.

[Swanger]

Does anyone know the cog sizes of these cassettes (12-25 and 12-27 9spd. Shimano) or a web site that
would have this information.

Thank You, Rick Swanger

 

[Bruce]

All the same except the top two:

12-13-14-15-17-19-21-23-25 12-13-14-15-17-19-21-24-27

I very much prefer the 12-27. When I need lower gears I prefer larger steps, and the 24-27 (11.8% =
log(17/15)) isn't even as big a step as the 15-17 (12.5%).

I wish Shimano made a 12-24 = 12, 13, 14, 15, 16, 17, 19, 21, 24. The 21-23 jump is too small for
the last jump.

-Bruce

"Swanger" <[email protected]> wrote in message
news:[email protected]...
> Does anyone know the cog sizes of these cassettes (12-25 and 12-27 9spd. Shimano) or a web site
> that would have this information.
>
> Thank You, Rick Swanger

 

[Swanger]

"Bruce" <[email protected]> wrote in message news:[email protected]...
> All the same except the top two:
>
> 12-13-14-15-17-19-21-23-25 12-13-14-15-17-19-21-24-27
>
> I very much prefer the 12-27. When I need lower gears I prefer larger steps, and the 24-27 (11.8%
> = log(17/15)) isn't even as big a step as the 15-17 (12.5%).
>
> I wish Shimano made a 12-24 = 12, 13, 14, 15, 16, 17, 19, 21, 24. The
21-23

Thanks a lot Bruce. I agree with you, the 12-27 looks like the better granny set up.

Rick S.

> -Bruce
>
>
> "Swanger" <[email protected]> wrote in message
> news:[email protected]...
> > Does anyone know the cog sizes of these cassettes (12-25 and 12-27 9spd. Shimano) or a web site
> > that would have this information.
> >
> > Thank You, Rick Swanger
> >
>

 

[Sheldon Brown]

Swanger wrote:
> Does anyone know the cog sizes of these cassettes (12-25 and 12-27 9spd. Shimano) or a web site
> that would have this information.

See: http://sheldonbrown.com/harris/k7.html

Sheldon "They're All There" Brown +--------------------------------------------------------+
| There is no conclusive evidence of life after death. | But there is no evidence of any sort
| against it. | Soon enough you will know, so why fret about it? | --Robert A. Heinlein |
+--------------------------------------------------------+ Harris Cyclery, West Newton,
Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts
shipped Worldwide http://captainbike.com http://sheldonbrown.com

 

[Sheldon Brown]

Bruce wrote:

> I wish Shimano made a 12-24 = 12, 13, 14, 15, 16, 17, 19, 21, 24. The 21-23 jump is too small for
> the last jump.

I'd be glad to make you a Shimano cassette like that, $69.95

I'd start with an Ultegra 11-21, ditch the 11 and 12 and install a top-position 12 and a 24 on the
bottom...and Bob's your uncle!

Sheldon "Custom K7" Brown +-----------------------------------------------------------+
| Always listen to the experts. | They'll tell you what can't be done, and why. | Then do it.
| --Robert A. Heinlein |
+-----------------------------------------------------------+ Harris Cyclery, West Newton,
Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts
shipped Worldwide http://captainbike.com http://sheldonbrown.com

 

[Onefred]

> I wish Shimano made a 12-24 = 12, 13, 14, 15, 16, 17, 19, 21, 24. The 21-23 jump is too small for
> the last jump.

The Shimano 105/Deore LX cassettes can be disassembled. They're not as light as Dura-Ace but they
are light enough, in my opinion.

Dave

 

[Mike Jacoubowsk]

> I'd be glad to make you a Shimano cassette like that, $69.95
>
> I'd start with an Ultegra 11-21, ditch the 11 and 12 and install a top-position 12 and a 24 on the
> bottom...and Bob's your uncle!
>
> Sheldon "Custom K7" Brown

How about a 12-29 for the new 10-speed DuraAce coming out? With no 10-speed triple option, I think
there's going to be quite a market for something that will push the limits of the new system. And
while I'm at it, let me personally rant about how silly it is that Shimano doesn't extend the range
for the 10-speed! As if everyone's asking for closer cog spacing... I just want a bit wider range
for these legs.

Shimano, in my opinion, really could have made a killing with an extended range 10-speed system.
There are a lot of people who really don't want a triple (some of whom really ought to have them,
but just can't bring themselves to admitting it), and a couple more teeth on the back would give
them a couple more years with that double they treasure so highly.

--Mike-- Chain Reaction Bicycles http://www.ChainReactionBicycles.com

 

[Pete Biggs]

Swanger wrote:
> Does anyone know the cog sizes of these cassettes (12-25 and 12-27 9spd. Shimano) or a web site
> that would have this information.

http://www.m-gineering.nl/cassettg.htm

~PB

 

[Pete Biggs]

Bruce wrote:
> I wish Shimano made a 12-24 = 12, 13, 14, 15, 16, 17, 19, 21, 24. The 21-23 jump is too small for
> the last jump.

Good idea. I also wish Campagnolo made 13-24 and 13-27 with 21, 24, 27 at the end. I have to
make my own!

~PB

 

[James Thomson]

"Sheldon Brown" <[email protected]> wrote:

> I'd start with an Ultegra 11-21, ditch the 11 and 12 and install a top-position 12 and a 24 on the
> bottom...and Bob's your uncle!

Aren't all 9spd 12t sprockets usable in the top position? I have an Ultegra 11-23 and an XT 11-32 on
my desk, and both twelves have the integral spacer and knurled face of a first-position 12.

James Thomson

 

[Bruce]

Sheldon,

Thanks for the offer. I've gotten used to the safety of the 27 on the short steep hills around
southeastern PA. As Mike mentioned, I one of those guys who refuses to use a triple. Hell, I even
tour with my usual chainrings of 50-38 and just slap on a 12-34 so I can sit & spin up the long
climbs in the Alps.

the future: 10-speeds: If I had an extra cog for the 12-27 I'd add a 16. As for the 12-34, all the
steps are about equal so it would be something in the middle again like a 15 or a 17.

-Bruce

"Sheldon Brown" <[email protected]> wrote in message
news:[email protected]...
> Bruce wrote:
>
> > I wish Shimano made a 12-24 = 12, 13, 14, 15, 16, 17, 19, 21, 24. The
21-23
> > jump is too small for the last jump.
>
> I'd be glad to make you a Shimano cassette like that, $69.95
>
> I'd start with an Ultegra 11-21, ditch the 11 and 12 and install a top-position 12 and a 24 on the
> bottom...and Bob's your uncle!
>
> Sheldon "Custom K7" Brown

 

[Matt O'Toole]

"Pete Biggs" <pLime{remove_fruit}@biggs.tc> wrote in message
news:[email protected]...

> Bruce wrote:
> > I wish Shimano made a 12-24 = 12, 13, 14, 15, 16, 17, 19, 21, 24. The 21-23 jump is too small
> > for the last jump.
>
> Good idea. I also wish Campagnolo made 13-24 and 13-27 with 21, 24, 27 at the end. I have to
> make my own!

Yup. It's really a shame because Campy has that neat A, B, C cog system that's a natural for mix 'n'
match cassettes. Too bad they don't make the cogs to round out the range. The individual cogs stop
at 26, I think.

Matt O.

 

[Matt O'Toole]

"Mike Jacoubowsky" <[email protected]> wrote in message
news:[email protected]...

> How about a 12-29 for the new 10-speed DuraAce coming out? With no 10-speed triple option, I think
> there's going to be quite a market for something that will push the limits of the new system. And
> while I'm at it, let me personally rant about how silly it is that Shimano doesn't extend the
> range for the 10-speed! As if everyone's asking for closer cog spacing... I just want a bit wider
> range for these legs.

I'm with you, Mike. However, there are some nice 9sp XT and XTR cassettes to choose from that are
pretty close -- 12-34?

I noticed Sheldon is making up some nice 13-30 and 13-34. If I wind up buying a bike with a double,
he can count on me as a customer. A 13-34 gives about the same range as a stock triple setup. And
with 9 gears, the gaps would be just fine.

> Shimano, in my opinion, really could have made a killing with an extended range 10-speed system.
> There are a lot of people who really don't want a triple (some of whom really ought to have them,
> but just can't bring themselves to admitting it), and a couple more teeth on the back would give
> them a couple more years with that double they treasure so highly.

Perhaps these people are having trouble spending $300+ for a new crank and left STI shifter, and
derailers and BB too if that's required. And perhaps Shimano's making a killing on them because they
have no other choice... so no wonder Shimano's not offering 13-34 10sp cassettes.

At least Shimano's 2004 left shifters are both double and triple compatible, or so I hear...

Matt O.

 

[Sheldon Brown]

I wrote:

>>I'd start with an Ultegra 11-21, ditch the 11 and 12 and install a top-position 12 and a 24 on the
>>bottom...and Bob's your uncle!

James Thomson wrote:

> Aren't all 9spd 12t sprockets usable in the top position? I have an Ultegra 11-23 and an XT 11-32
> on my desk, and both twelves have the integral spacer and knurled face of a first-position 12.

Sure enough, never noticed that. Not a practical issue for us, 'cause we've got squadrillions of top
12s cluttering up the shop from cassettes we've customized to top out at 13 or 14. Most of our
custom cassettes are based on 12-top stock cassettes.

Sheldon "12-28" Brown +----------------------------------------------------------+
| The longer I live the more I see that I am never | wrong about anything, and that all the pains
| that | I have so humbly taken to verify my notions have | only wasted my time. -- George
| Bernard Shaw |
+----------------------------------------------------------+ Harris Cyclery, West Newton,
Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts
shipped Worldwide http://captainbike.com http://sheldonbrown.com

 

[Bill K.]

You can get a 13-25 in the Shimano 105 line up. Great for training and all around riding. I think
that you can take a 12-27, buy a 16 tooth 8 speed cog, and make a 13-27. I think that the 8 speed
cogs are still available, and I'm pretty sure that the 13 has a built in spacer. Check with Sheldon
Brown to see if you can do this......12's are overrated, unless you are racing. The way I see it,
you can spin a 13 up to 36-38 mph without too much trouble. If you're going downhill, and want to go
faster, just get into an areo tuck.

 

[Pete Biggs]

Matt O'Toole wrote:

>> Good idea. I also wish Campagnolo made 13-24 and 13-27 with 21, 24, 27 at the end. I have to make
>> my own!
>
> Yup. It's really a shame because Campy has that neat A, B, C cog system that's a natural for mix
> 'n' match cassettes. Too bad they don't make the cogs to round out the range. The individual cogs
> stop at 26, I think.

There are 28 and 25 tooth Mirage/Veloce 9sp cogs, but no 24 or 27.

I customize using two Marchisio* cogs - which are not so practical. Lightweight but are fiddly to
assemble and the profile of the teeth is so peculiar that the chain can easily derail when
back-pedalling (if chainline is less than ideal in bottom gears). Fitting back-to-front helps, but
not always enough

* http://anysystem.de (Sprockets up to 30T to fit any speed Shimano or Campag cassette hub)

~PB

 

[Paul Kopit]

On Fri, 12 Sep 2003 15:58:36 GMT, "Matt O'Toole" <[email protected]> wrote:

>I noticed Sheldon is making up some nice 13-30 and 13-34. If I wind up buying a bike with a double,
>he can count on me as a customer. A 13-34 gives about the same range as a stock triple setup. And
>with 9 gears, the gaps would be just fine.

In my limited experience, getting a 110 bolt pattern double, 48/34 or
50/34, permits you to use standard cassettes and get low ranges. My preference is 48/34 and a 12/25
but a the 34/27 is a 39/31.

With 10 speed readilly available, a triple for road riding becomes less of a necessity for most
riders. I'm talking about the standard ranges 52/42/30 and 12/27.

 

[Matt O'Toole]

"Paul Kopit" <[email protected]> wrote in message
news:[email protected]...

> On Fri, 12 Sep 2003 15:58:36 GMT, "Matt O'Toole" <[email protected]> wrote:
>
> >I noticed Sheldon is making up some nice 13-30 and 13-34. If I wind up
buying a
> >bike with a double, he can count on me as a customer. A 13-34 gives about
the
> >same range as a stock triple setup. And with 9 gears, the gaps would be just fine.
>
> In my limited experience, getting a 110 bolt pattern double, 48/34 or
> 50/34, permits you to use standard cassettes and get low ranges. My preference is 48/34 and a
> 12/25 but a the 34/27 is a 39/31.
>
> With 10 speed readilly available, a triple for road riding becomes less of a necessity for most
> riders. I'm talking about the standard ranges 52/42/30 and 12/27.

You're absolutely right.

I guess it boils down to what's available to you and how much it costs. For me, slapping a 13-34
cassette on a standard modern double (39-53) would do the trick. However, depending on what
components you already have, a 34-48 crank could achieve the same thing.

I find I need (or prefer) about a 28-30" low gear. I'm not quite going to get it with a 34/27, but a
39/34 just about works. The high is less important, but I like 105-110".

Either way you'd probably need a new rear derailer, but it's still way cheaper than converting to a
triple. You'd probably need two new derailers, maybe a new BB. and with pre-2004 Shimano, a new STI
left shifter, in addition to the new crank.

I've been thinking a lot about this lately, because I'm shopping for a new (used) bike. Unless I get
lucky and find one with a triple, the question is how to get the gearing I need, and how much it's
going to cost me, above the cost of the bike itself.

Matt O.

 

[B]

>12's are overrated,

Unless you have a 48 up front! B

(remove clothes to reply)

 

[Suzy Jackson]

"Pete Biggs" <pLime{remove_fruit}@biggs.tc> wrote in message
news:[email protected]...

> Good idea. I also wish Campagnolo made 13-24 and 13-27 with 21, 24, 27 at the end. I have to
> make my own!

How ever do you do that? I just ordered a 13-26 and 13-28 Campy loose cog 9 speed cassette, with the
hope of putting the 28 on the last position of the 13-26, so I have a cassette that goes
13-14-15-16-17-19-21-23-28, for an upcoming 150km ride I'm doing that features a 2.6km 10% climb
after about 70km.

But I worry that I'll be able to do it, as I'm using a short cage rear derailleur. The only reason
I'm even going to try is that I use a 49 tooth big chainring on the front, limiting the total
difference in chain wrap.

So a 21-23-27 on the end would be truly wonderful (or perhaps even a 21-24-28), but where do you get
the 24 and 27 tooth cogs?

Regards,

Suzy