Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 08-24-08, 04:54 AM   #1
ALPhillips
Senior Member
Thread Starter
 
ALPhillips's Avatar
 
Join Date: Jan 2006
Location: NE Alabama
Bikes: 06 C'dale Synapse
Posts: 90
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Wide Range 10 Cassette

I have a Shimano 12-27 ultrega 10 speed cassette now. I'd like to convert it to a 14-34 by adding some flat clogs (30t and 34t) and a first position 14t (if it exists) to make a 14-15-17-19-21-23-25-27-30-34. I dont not like the 11-34 10 speed offered by IRD because i do not need the 11t, 12t, and 13t for my situation. Is this an option for my 10 speed? Any other suggestions?

Anyone heard of a 14t first position 9 speed cog being ground down to the width of a first position 12T 10 speed cog?

Thanks, Anthony
__________________
Slim
ALPhillips is offline   Reply With Quote
Old 08-24-08, 05:31 AM   #2
Ex Pres
#39
 
Ex Pres's Avatar
 
Join Date: Dec 2007
Location: the 35223 (AL)
Bikes:
Posts: 6,244
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 7 Post(s)
Shimano makes 14t first position cogs for their junior [racing] geared cassettes.

My guess is that cog is a little pricey from them, however.
Ex Pres is offline   Reply With Quote
Old 08-24-08, 05:48 AM   #3
HillRider 
Senior Member
 
Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Posts: 28,776
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 36 Post(s)
Shimano makes an Ultegra-level (SC-6600) junior-geared 14x25 10-speed cassette but they make no 10-speed cogs larger than 27T. You may be able to add a 9-speed 32 or 34T cog behind that cassette and remove one of the intermediate cogs to make room. I don't think you will be able to fit two or three 9-speed cogs into the stack as their greater thickness may not allow the lockring to thread on.

BTW, Shimano also makes a 16x27 10-speed SC-6600 cassette if you are really willing to give up any small cogs to get the 27.

I think it would be less expensive just to buy the 14x25 or 16x27 and add a 32T cog than trying to juggle the 12x27 with a bunch of loose cogs.
HillRider is offline   Reply With Quote
Old 08-24-08, 05:39 PM   #4
ALPhillips
Senior Member
Thread Starter
 
ALPhillips's Avatar
 
Join Date: Jan 2006
Location: NE Alabama
Bikes: 06 C'dale Synapse
Posts: 90
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
thanks for the info. Anthony
__________________
Slim
ALPhillips is offline   Reply With Quote
Old 08-24-08, 06:22 PM   #5
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
There have been postings saying that you can't add a single cog to the back side of a Shimano 10-speed cassette because of the conical design. I don't have any 10-speed Shimano cassettes so I'm not sure what that means. I have added single cogs to the back of 9-speed Shimano cassettes.
I'm wondering if it would be possible to start with the IRD 11-34 and change a few cogs.
I have ground down the built-in spacer on a first position 13 cog to make it the same thickness as a 9-speed. This is an easy job on a bench grinder, the steel is too hard for filing.

Al
Al1943 is offline   Reply With Quote
Old 08-24-08, 11:37 PM   #6
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I've seen several IRD 10-speed 11-34 cassettes, and they don't seem to be spaced right. Get the indexing dialed for the high end, and it's off on the low end. Get it dialed on the low end, and it's off on the high end. Different chains, different derailleurs, low-normal, top-normal, nothing really fixes the core issue: the spacing from cog to cog is wrong. So unless they fess up to a spacing problem and revise their design, I wouldn't bother with IRD's cassette if I were you.
mechBgon is offline   Reply With Quote
Old 08-25-08, 02:54 AM   #7
Bill Kapaun
Senior Member
 
Bill Kapaun's Avatar
 
Join Date: Feb 2007
Location: Mid Willamette Valley, Orygun
Bikes: 86 RockHopper,2008 Specialized Globe. Both upgraded to 9 speeds.
Posts: 9,198
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
I don't have any 10 speed stuff, but it was my understanding that the 3 largest cogs are on a carrie and can't be separated???
I made an 8 speed cassette by using EIGHT, 7 speed cogs and thinning the 7 speed spacers to give me 8 speed spacing. (center to center)
Maybe you could buy a 9 speed cassette with the needed 3 larger cogs, and thin the spacers?
Maybe that's what IRD does, without being fussy enough about spacer thickness.
According to my info, a 10 speed cog is .0071" thinner and the spacer is .0083" thinner than 9 speed.
Bill Kapaun is offline   Reply With Quote
Old 08-25-08, 10:27 PM   #8
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by Bill Kapaun View Post
Maybe that's what IRD does, without being fussy enough about spacer thickness.
IRD's using alloy spiders for the larger cogs. But it's the same fundamental problem: the spacing's not correct.

As for the OP's overall goal, it might be possible to simply switch to a compact triple (22-32-44) to effectively turn the 12-27 into the equivalent of a 14-34, provided the necessary 10-speed chain jives OK with the crank's ring spacing. But I don't know what the OP's current crank setup is, so who knows. In that scenario, the Shimano SLX or DeoreXT cranks would be worth a look.

Last edited by mechBgon; 08-25-08 at 10:34 PM.
mechBgon is offline   Reply With Quote
Old 08-26-08, 03:30 AM   #9
Deanster04
Senior Member
 
Deanster04's Avatar
 
Join Date: Dec 2005
Location: Boulder, Colorado
Bikes: Cinelli Supercoursa 69, Ritchey Breakaway Cross, Mondonico Diamond Extra 05, Coors Light Greg Lemond (built by Scapin) 88, Scapin MTB, Stumpjumper 83, Specialized Stumpjumper M4, Lemond Poprad 2001
Posts: 1,366
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
Originally Posted by mechBgon View Post
IRD's using alloy spiders for the larger cogs. But it's the same fundamental problem: the spacing's not correct.

As for the OP's overall goal, it might be possible to simply switch to a compact triple (22-32-44) to effectively turn the 12-27 into the equivalent of a 14-34, provided the necessary 10-speed chain jives OK with the crank's ring spacing. But I don't know what the OP's current crank setup is, so who knows. In that scenario, the Shimano SLX or DeoreXT cranks would be worth a look.
You would also need the get the XT FD and RD for that setup. The FD would be needed with the XT Triple front crank set and the RD would be needed to take up the wide range 22 x 27 using the long cage. An older 105 long cage DR would work as well. Good LUck.
Deanster04 is offline   Reply With Quote
Old 08-26-08, 10:45 AM   #10
Al1943
Senior Member
 
Join Date: Feb 2005
Location: Oklahoma
Bikes: Trek 5500, Colnago C-50
Posts: 9,433
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
I don't know what kind of frame we're talking about but if the front derailleur is a braze-on type it's probably not going to adjust low enough for a chainring set smaller than 50-39-28 approximately.

Al
Al1943 is offline   Reply With Quote
Old 08-28-08, 11:34 PM   #11
mechBgon
Senior Member
 
mechBgon's Avatar
 
Join Date: Jul 2002
Bikes:
Posts: 6,957
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Quote:
You would also need the get the XT FD and RD for that setup.
There would also be the question of front-derailleur indexing compatibility, which will depend on what type of shifters this person uses (road STI, bar-end, road flatbar, mountain flatbar). Unfortunately, we're working from scanty information here.
mechBgon is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 08:52 AM.