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chorus 03 26?(13 posts)

chorus 03 26?fraser
Jan 28, 2004 8:52 PM
i am running campy chorus 03 10sp. 12-25 cass.
my questions.
can i run a 26 on std Der ? i presume a 27 is too large.
do i have to buy a new cass. 13-26 and does that mean new chain too ?
or can i buy a single 26 and swap things around. what tools etc do i need ?
thanks for any help.
13-26 with short cage no problem. Don't worry about the chain,Spunout
Jan 29, 2004 5:52 AM
but check it carefully and you should be okay.

You will need a lock-ring tool and a chain whip.

You cannot buy only the 26. If you are using the 12-25 now, try going to the 13-29 for more difference but you may need a new chain, and careful with the sc RD.
Jan 29, 2004 6:54 AM
Unless you one of theose folks who thinks that they can't live wihtout an 18T cog, the 13-26 doesn't make sense to me. You lose the 12T top cog and the 26T cog is insignificantly lower than a 25. If you need lower gears, a 13-29 makes more sense.

Some folks have mangaged to use a 13-29 with a short cage R/D, but it won't necessarily work on all bikes. Due to differences in the derailleur mounting, the derailleur may not clear the 29T cog. Adjusting the chain length is also more crucial if a short cage is used. If it's too long it may hang loose in the 39/14 combo and if it's too short, the R/D may be overextended if the 52/29 is accidentally used.
spin and win ?fraser
Jan 29, 2004 1:38 PM
why ? because i am preparing for some serious hills. MT baw baw classic is a 90km race with a mtn top finish. final climb is 6km @ 13% i just completed the audax alpine classic(200km) and grovelled up the last climb of the day(25km @6% ?) with a cadence of about 60 on my 25. i would have killed for another gear. agreed a 26 wont make a huge difference but i thought that would be the biggest i could run....a 27 is what i really want. i would intend only using this configuration for big days in the hills, at other times i am intending using an 11-23, swapping between them. I can try a 29 with short DER, id be happy if it didnt get over to the 29 if i could use the 27.

thanks for your comments
The 13-29 doesn't have a 27T cogB2
Jan 29, 2004 3:09 PM
It has 13 14 15 16 [17 19] [21 23] [26 29]

[xx xx] = cogs that are preassembled onto a carrier.

BTW - I doubt if you would have any problem using a 13-29 with a short cage derailleur. Mine works fine (with the proper chain length) and I've heard many others indicate the same.

mavic m10fraser
Jan 29, 2004 4:35 PM
i have just found that mavic make a campag compatable 13-27.perhaps that is the go. if i get a chain to suit and swich as and when reqd. sounds like the short der. will not be a problem.

not campy compatible...C-40
Jan 29, 2004 5:31 PM
The M10 cassette only fits on Mavic wheels with M10 cassette bodies, which have shimano splines, but a longer body to permit campy spacing. If you have a campy or regular shimano wheel, it won't work.
Missing 12Keeping up with Junior
Jan 29, 2004 6:45 PM
How about picking up a Centaur or Veloce 13-26? All but the largest cogs are individual (i.e. not in carriers). Price of Veloce cassette is not too much more than picking up individual paired cogs for Chorus. This way you will end up with a handful of individual cogs so you can mix and match. I assume there will be some downhills where you want a 12. With Veloce you can lose the 18 and still use your current 12 and 13. You get the 26 you are looking for and a set of replacement cogs in the middle of the cassette where you use them most.

Is this a "race" or a "ride"? It would seem as though if it is a race and you are in a 29 you won't be with the lead field. In addition, if it is a race it is too easy to be in your big ring and not think and find yourself in the 53x29 without enough chain. If it is a ride then be comfortable and look at the 29 option.

Lots of compatiblity info at
Missing 12fraser
Jan 29, 2004 7:42 PM
campy wheels, yes. its a race, but you are right. i wont be in the lead field !
i agree a 29 is too much. your suggestion of a cheaper cass. was something i was thinking about too. ta.
Because the 18 is great, that's whyKerry Irons
Jan 29, 2004 8:25 PM
For those of us living in flat country, the 18 is a perfect gear for many conditions. Having the closely spaced 17, 18, 19 is just the ticket for rolling miles on flat roads.
Because the 18 is great, that's whykoala
Jan 30, 2004 3:15 AM
I was beginning to think nobody else understood what you have just expressed. I have one bike without an 18(rain bike) and on a day when I do a fairly flat route, I notice the gap.
Flat route is the key...C-40
Jan 31, 2004 4:29 PM
Very few of us ride routes that are that flat. Unless you ride roads that don't vary in grade on a regular basis, the 18 is pretty worthless. It's only a 5% change, compared to the average 8-9% change per shift. Most riders can easily cover a 10% or 10rpm range without problem.
re:Because the 18 is great, that's whyukiahb
Jan 30, 2004 9:00 PM
I agree, also leaving the 18 out screws up the ramp timing so the 17-19 shift is not so great...found this out when I tried combining cogs from a 12-25 and a 13-29 to make a 12-29...