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14-23/25 10sp Dura-Ace cluster?(6 posts)

14-23/25 10sp Dura-Ace cluster?Janitor
Dec 16, 2003 4:53 AM
I need a cluster starting from a 14 tooth (junior gear restrictions) that is either 10sp Dura-Ace or something that is compatiable and that is light weight (no solid steel piece of crap for me!). I have heard that Mavic make a suitable cluster ...
not yet...C-40
Dec 16, 2003 7:24 AM
Mavic's M10 cassette cogs are all steel with individual spacers that can be exchanged for Campy 10 or Shimano 9 spacing. Campy 10 and Shimano 9 speed cogs are essentially the same width (1.75 and 1.78mm), which makes this possible.

http://www.mavic.com/servlet/srt/mavic/road-tech?lg=uk

The new shimano 10 cogs are only 1.6mm wide, so merely changing spacer width could result in insufficient room for the chain between the thicker cogs.

I can't really imagine why you need a 10-speed drivetrain with this gearing restriction.
re: Junior GearsKeeping up with Junior
Dec 16, 2003 7:38 AM
I doubt that Dura Ace will have a junior cassette, typically these are not offered at the high end of the component lines. Without doing any research my guess would be that to get a 14-XX cassette you would be looking at the 105 line and I dont think 10 speed has trickled down to that Shimano group yet. For instance Campy only offers a 10 speed junior cassette at the Centaur level.

Not sure if Mavic offers a cassette starting with a 14, but their cassettes come as individual cogs rather than on carriers. If you are counting grams you may regard it as a solid piece of crap since it will come in at a higher weight than a mix of Ti cogs on carriers.

Your best bet might be to go with a 45 tooth chainring and a 12-XX Dura Ace cassette. The trouble with this approach is that many juniors are so fashion conscious that they do not want to ride a 45 because it "looks" wierd. Be sure to rollout your bike because the 45x12 combo puts you closer to the limit than 52x14 gearing. This may vary with different tire profiles.

If you are not racing national level races you might use a 13-XX cassette and use your limit screw to blockout the 13 for racing/rollout purposes. When doing this on a Campy derailer I had to completely remove the screw, take out the spring and then reinstall the limit screw and adjust to block the 13 tooth cog.

One final option to try might be to get yourself a 14 tooth first position cog from a 9 speed cassette. You will probably have to buy the whole cassete, but they are fairly cheap I think. Combine this 14 tooth first position cog with nine cogs from a 10 speed cassette. You may need to grind off some of the built in spacer on the 14 tooth cog to make it compatible with 10 speed spacing.
Not exactlyChen2
Dec 16, 2003 9:35 AM
Shaimano has for a long time offered a 14-25 in Ultegra 9-speed. The individual 14 with built-in spacer has been available from www.sheldonbrown.com (my wife uses one). I don't know if it can be used with a 10-speed, Sheldon might know.
~Al
re: 14-23/25 10sp Dura-Ace cluster?mjbmx5
Dec 16, 2003 1:49 PM
In the past 14-25 and 13-25 have been available only in Ultegra or lower cassettes. If you want to use a 52 tooth chainring then I think you are going to be using an effective 8 speed cassette. If you can lower your front derailleur far enough then using a 45 chainring with 12-23 or 12-25 will work well. Shimano does not have good gearing for young juniors. A 14-29 would be ideal if it was available.
re: 14-23/25 10sp Dura-Ace cluster?swvegg
Dec 18, 2003 10:40 AM
I bet you could get a custom one made overseas. I believe Miche is one of the companies that could do that. Me, I'm just gonna use DA 9 sp for 1 more year.