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dura ace question(4 posts)

dura ace questionturtlemoye
Oct 5, 2001 3:50 AM
What is the largest rear cog that an 8 speed dura ace rear derailluer can handle?

--Turtle
re: dura ace questionSluggo
Oct 5, 2001 4:32 AM
I believe the new nine-speeds are max 27 tooth cog but for the previous generation eight-speed I think it was 26 tooth.

I have the eight speed and have 3 cogsets: 12-21, 12-25 and 13-26.
8-speed Dura-Ace rear dXbreck
Oct 5, 2001 8:26 AM
This dX was designed to handle a max rear cog of 26t. and a min of 12t. The greatest difference in size between the two front chainwheels should not exceed 14t. Total Chain Wrap capacity = 26. Chain Wrap Cap = diff between front chain rings plus diff between rear cogs. E.g.., a 52/42 front and 12/21 rear yields 10 + 9 = 19 CWCap.

The very early D-A cassettes were pinned and one could un-pin them and make up a custom cassette. D-A later (quickly!) became available only on a fixed yoke "spider" style alum carrier where the larger cogs were screwed on, later (quickly!) riveted.

The basic 8-speed D-A cassettes available were 12/21; 12/23; 12/25; 13/23; 13/26.

cheers,
breck
8spd D/A can handle 11-28tbattaglin
Oct 6, 2001 11:49 PM
I have this set-up on my second bike with a complete 8spd D/A set-up. On my Giant TCR with 8spd sti and 9spd rear der., I have placed a 12-26t, and have also tried the 28t once with no problems, just a little tweaking with the derailleur. Hope this helps.