Will an 11-28 work with Dura Ace RD-7800?
06-07-10, 10:02 PM
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Will an 11-28 work with Dura Ace RD-7800?
Sorry if this has been brought up before but searches here keep giving me discussions on sram XX..
The 2008 RD-7800 manual says maximum rear cog is 27t. 2009 RD-7900 specifically says "New design with an expanded chain wrap capacity accommodates a maximum 28 tooth cog for better compatibility with compact cranks".
So what if I tried throwing on an 11-28 with the 7800? I'm not sure if I have the short or long cage or not, but both state a maximum of 27 teeth on the rear cog.
Appreciate the help..
The 2008 RD-7800 manual says maximum rear cog is 27t. 2009 RD-7900 specifically says "New design with an expanded chain wrap capacity accommodates a maximum 28 tooth cog for better compatibility with compact cranks".
So what if I tried throwing on an 11-28 with the 7800? I'm not sure if I have the short or long cage or not, but both state a maximum of 27 teeth on the rear cog.
Appreciate the help..
06-08-10, 11:33 AM
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I tried it and could not make it work without issues. Maybe a chain line thing? Went back to the 12-27. In the big picture what does one tooth on a cassette get you?
06-08-10, 11:47 AM
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Yes. That is the set up I have. I had to get a longer chain. I had a 12-27 before and I like have a little extra on both ends. There are times when I can't find the perfect cruising gear in the middle because by definition there are some gaps with the wide spread in gears.
06-08-10, 12:57 PM
#7
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I have done 11-27 and I have done 11-28. I went back to 11-27 when I went with Di2.
The practical difference between 27T and 28T? Almost nothing. A 2 mph wind is as big a deal.
The practical difference between 27T and 28T? Almost nothing. A 2 mph wind is as big a deal.
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