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Modifying 9spd cassette from 12-23 to 12-26(4 posts)

Modifying 9spd cassette from 12-23 to 12-26Michelle
May 25, 2001 9:15 AM
A friend is giving me a 12-23 cassette which I want to modify to a 12-25. Unfortunately, they dont sell single 25's so have to go with a 26. Is that a good/bad idea? Which ring would be the best to remove in this case?

Not as easy a question as it sounds.Spoke Wrench
May 25, 2001 10:37 AM
If you just replace the 23 cog with a 26, the new step will be from 21 to 26 which kind of defeats the whole concept of having a 9-speed cassette. Probably won't shift so great either.

If you look to the other end of the cassette, and just try to eliminate the 12, you may find that certain cogs are "position specific." In other words, a 13 tooth cog that is designed for the second position might not work in the first position.

There are people on this board who cobble all kinds of things together and are perfectly satisfied with the result. I kind of suspect, however, that some of them might have lower standards of acceptable performance than I do. I'd bite the bullet and buy the factory cassette that has the gears that I want.
Another thing to consider ....rattled
May 26, 2001 12:05 PM
If you want to change a cog make sure it matches the "series" of the original: If you look closely at the cassette you have now it will indicate the number of teeth along with the a two letter series, such as "ab" or something similar ... if you go with a different series the shifting will definitely suffer.

It can be done as a 13x26...Tom C
May 26, 2001 2:15 PM
Your Campy 12x23 are all A cogs. It can be done if you can live with a 13 as your little cog.Your first position cog is 12A-1p(1p meaning first position)and your second cog is 13A. Both these cogs would be eliminated . You would then need to buy a 13A-1p and a 26A. you must also keep the 23. The sequence then follows 13A1-p, 14A, 15A, 16A, 17A,19A,21A,23A,26A.The problem might be the cost of individual cogs i.e. Branford, for example, lists the 13A-1p for $14.88. They also don't list a separate 26A but you may know someone or have a friendly bike shop to provide you with these 2 cogs. Your best bet would be to go to Gearlink as they have the steel cassettes in 13x26 for $28.95.