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Hey Cyclopathic - about that cassette....(6 posts)

Hey Cyclopathic - about that cassette....speed-chump
Feb 15, 2002 10:09 AM
I was reading about your mixed cassette below, maybe you
or somebody else could answer this...

Is it possible to take a 25 from an HG-70 cassette and
put it on BEFORE the grouped cogs of a Dura-Ace cassette,
and make up for it by dropping one of the smaller single
Dura-Ace cogs?

I have a race in a couple weeks that has some nasty dirt
road climbs that a 25 would really help, but I'm too cheap
to spring for a new cassette.

I've never done itcyclopathic
Feb 15, 2002 10:32 AM
but I heard about it from a guy who claimed he did it.

You'd need to put on hub 25t, put a spacer from HG-70, drop one of the smaller cogs on you 12-23 DA (13,14,15 or 16) and put DA cluster/cogs on. Alternatively you could drop 12t, but you'd also need to use 13t and lockring from you 13-25 HG-70.

Be careful if you run DA hub with Ti or any other wheel with Al freebody you may damage it in 39-25 combo (assuming you are strong/big guy)

Also check Sheldon Brown's site he has a write up on custom cass building good luck
re: about that cassette....Chen2
Feb 15, 2002 11:01 AM
Shimano make an Ultegra cassette in 13-25, the 25 is an individual cog, code #10P25B4-2. I bet it would do the job for you. You may be able to buy it from
Thanks guys. That helped a lot! (nm)speed-chump
Feb 15, 2002 11:44 AM
about that cassette....Chen2
Feb 15, 2002 2:56 PM
The Ultegra 13t cog with built-in spacer is code # 10P1300B, you'll need it to replace the 12 and 13 to make room for the 25. I've ordered that part from Sheldon Brown.
re: about that cassette....cyclopathic
Feb 15, 2002 6:28 PM
105 cass is only 28$, how much is the 25t, 13t and lockring?