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"converting a dura ace cassette"(4 posts)

"converting a dura ace cassette"chiym
May 3, 2002 6:28 AM
"Hi everyone
I'm currently running a 12 - 23 dura ace cassette. I'd ideally like to run a 13 - 23 as I rarely use the 12 and could do with a 18. Unfortunately Shimano don't make them. As far as I can see I have two options:

1. But a 13 - 23 105 cassette and use the 13 and 18 sprockets giving:
13 [14] [15] [16 17] 18 [19 21 23]
This would be he cheapest option I think, where [ ] are dura ace sprockets. I presume that this is possible as the 105 sprockets are loose. The thing I'm concerned about is whether placeing a loose 18 sprocket between the two sprocket carriers would cause any deterioration in shifting performance - ie shifting ramps not aligned properly??

2. Buy a 13 - 23 6500 cassette giving
(13) [14] [15] (16) (17-18) [19 21 23]
[ ] = dura ace ( ) = ultegra
This option would probably be slightly lighter and there shouldn't be any effect on shifting performance. However it is slightly dearer.
What does everyone think?"
keep the 12-23 and get a smaller chainring nmDougSloan
May 3, 2002 6:38 AM
Check out Sheldon Browntimfire
May 3, 2002 8:03 AM
Check out Sheldon Brown's site. He discusses making custom cassettes.

http://www.sheldonbrown.com/k7.html

BTW, Shimano makes a pre-set 13-23 Ultegra cassette. I'm guessing you want to want to keep the price low, but if you're willing to pay for an entirely new cassette you wouldn't need to worry about mix and matching sprockets.

--Timothy Kleinert
re: "converting a dura ace cassette"Chen2
May 3, 2002 11:50 AM
I think you can probably get what you need from Sheldon Brown. You'll need a 13 with built-in spacer and a single 18. The cogs he sells are not necessarily Shimano but they are compatible. And they won't be Dura-Ace. My wife and I are both running cassettes that are combination Dura-Ace, Ultegra, XTR, and Sheldon Brown. They shift fine, I can't detect any loss in shifting performance. I usually run a 13-25 or 13-26 with mixed cogs. And as the other poster said, there is an Ultegra 13-23 available.
~Al