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Campy cassettes(13 posts)

Campy cassettesThe Human G-Nome
Aug 18, 2003 10:33 AM
can you change out individual cogs of different sizes on Campy 10spd cassettes? ie, could you change out the 13 from a 13-26 with an 11? i'm relatively confident this is a stupid question, but i had to ask anyway.

yes, you can. nmLeroy
Aug 18, 2003 10:45 AM
not necessarily....C-40
Aug 18, 2003 11:39 AM
Campy cogs are designed to work in the proper progression. Replacing a 13 with an 11 for an 11-14 jump is bad idea. Won't shift right and there would be a huge range of speed not covered by any gear.

Only the first few cogs are separate. Others are grouped in pairs that can't be taken apart.

Info on which cogs are in pairs and the proper cog progression is available at or
I agree - 11 to 14 seems like a big jumpB2
Aug 18, 2003 12:16 PM
I bought a 12T (1st position) and 13T (2nd position) from Branford and converted a 13-29 to a 12-29. I had to lose the 16T cog to do so though. This seems to provide a reasonable progression without any overly large steps.

As C-40 indicated, all the cogs larger than 16T are grouped together and individual cogs can't be separated.

Question on Campy 12-29 cassettesam-g
Aug 18, 2003 12:41 PM
I've also considered, modifying the Campy 13-29 to a 12-29 as you describe to use with their 50-40-30 chainring set. Please advise the Campy Group you're using. Since you've performed this modification, how does it shift? Is it important for the teeth on the cassette to be in perfect alignment (now missing the 16 cog) as on the chain rings for crisp shifting? Does the Campy long cage R. Der. handle this extra range without problems, especially at the extremes?

Question on Campy 12-29 cassetteukiahb
Aug 18, 2003 4:16 PM
FWIW I tried leaving out the 16t (and adding a 12t) to make a 12-29 and it worked, but the 15-17 shift was not so great sometimes as the ramp timing is screwed up...went back to a 12-25 and just install the 13-29 for occasional very long and hilly rides....found I missed the 12 more than the 29 in most cases. Also, Centuar cassettes have less paired cogs than Chorus cassettes...e.g 17 and 19 are nor paired on Centaur but are on Chorus....this means more weight but less potential for creaking from loose rivets.
Do you REALLY miss that 12 ;)Cat 3 boy
Aug 19, 2003 6:26 AM
I'm very impressed by your apparent strength, you must regularly cruise at 30+ mph if you really miss not having a 12. I only use a 12 on downhills or in a v fast moving race peleton.

Have you ever been dropped for not having a high enough top gear? I doubt it.
IMHO a close spaced cassette helps keep a high cadence & therefore speed rather than having a v high top gear. Hence my favourite: 13-14-15-16-17-18-19-21-23-25

Interested to hear others opinions.
Yeah, On long down hills!sam-g
Aug 19, 2003 10:24 AM
Overall I agree with you as I rarely if ever use the 12 cog except on downhills. In fact on my current bike I installed 50-36 TA chainrings with a 12-27 cassette to give me a more usuable range of gear options. However last month I rode in the Bicycle Tour of Colorado (including Mt. Evans 14,264' on day two) and regularily descended in the 53/12 gear for almost 20 miles. The bike I rented had an Ultegra triple group which gave me both a lower and higher gear than my current setup. Since I didn't like the 42 middle ring, I was looking at the 50-40-30 crankset which Campy offers but have some reservations that the 50/13 might not be enough on those long downhills. Hence my interest in a 12-29 cassette.

try a 53/39/30C-40
Aug 19, 2003 3:16 PM
I passed on Campy's triple crank for my otherwise all Record drivetrain, due to the poor chainring selection. Got a 53/39/30 FSA with ISIS bottom bracket. So far it's been trouble free (first 700 miles).
Then again, if you coast in a tight tuckKerry Irons
Aug 19, 2003 4:25 PM
I have this experience all the time when things get above 30 mph. Other guys are pedaling, and I'm in a tight tuck coasting right along side them (and resting for the next uphill section). A tight tuck is defined as knees on the top tube, hands on the bar right next to the stem, chin just about on the stem. It's a rare downhill where I am not as fast or faster than the pedalers.
yesThe Human G-Nome
Aug 19, 2003 10:53 AM
in fact, i just got dropped at Corral Hollow on the long, fast descent because i completely spun out my 13.
Do you REALLY miss that 12 ;)ukiahb
Aug 21, 2003 9:51 PM
yeah, I really do miss the 12 more than the has nothing to do with strength, it's just personal preference after trying it both ways...can the sarcasm pal...
Shifting no problemB2
Aug 19, 2003 7:26 PM
Since I converted the cassette, I haven't noticed any change in shifting to or from any of the cogs. The drivetrain still shifts flawlessly. Each cog has a little dot you line up in a spiral to assure that they line up correctly for shifting.

The only reason I wanted the 12 is for long mountain descents. It's more for fun than anything. With the guys I ride with it becomes a constant cat and mouse game on the entrie descent. A series of sprints and breaks if you will. The highest gear I ever use on the flats is 14 or 15.

BTW - If you don't like the 12T in there, take out it out and put the 16T back in. It's as easy as that.