Shimano CS-6700 Ultegra Compatibility
04-29-14, 07:06 PM
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Shimano CS-6700 Ultegra Compatibility
I am upgrading some components on my Trek Madone 3.1, full specs in link... 2012 Madone 3.1 H2 (Compact) - Bike Archive - Trek Bicycle
The crank set has been upgraded with a Shimano Ultegra 53/39.
The current Shimano cassette is Tiagra 12t/30t with a Shimano 105 short cage RD.
I read some posted opinions on Amazon referring that Shimano claims the Shimano CS-6700 Ultegra is NOT compatible with the 105 RD.
Then others posted it would work.
I plan on ordering the same configuration of 12t/30t for the CS-6700.
Anyone have an experience or an opinion about this?
Thanks in advance.
The crank set has been upgraded with a Shimano Ultegra 53/39.
The current Shimano cassette is Tiagra 12t/30t with a Shimano 105 short cage RD.
I read some posted opinions on Amazon referring that Shimano claims the Shimano CS-6700 Ultegra is NOT compatible with the 105 RD.
Then others posted it would work.
I plan on ordering the same configuration of 12t/30t for the CS-6700.
Anyone have an experience or an opinion about this?
Thanks in advance.
04-29-14, 07:19 PM
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The serious issue is take up capacity. I believe (check this because I didn't) most Shimano short cage RD have 27t of take up capacity. Your combination has 18t in the cassette + 14t in the chainset, for a total of 32t.
Take up capacity has some fudge room, but I suspect this may be too much. (Hillrider probably tried something similar once and would know). You can cheat this if you measure the chain so it loops the big/big + 1" to spare, and avoid running the inner ring with the smallest few rear sprockets.
One trick that raises RD take up capacity slightly is a larger lower pulley (leave the original upper). That and careful chain measurement may make this workable, or limit the unusable combination to the 39/12 or or 13.
Take up capacity has some fudge room, but I suspect this may be too much. (Hillrider probably tried something similar once and would know). You can cheat this if you measure the chain so it loops the big/big + 1" to spare, and avoid running the inner ring with the smallest few rear sprockets.
One trick that raises RD take up capacity slightly is a larger lower pulley (leave the original upper). That and careful chain measurement may make this workable, or limit the unusable combination to the 39/12 or or 13.
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An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
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FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.
Last edited by FBinNY; 04-29-14 at 07:33 PM.
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