Question about Shimano Ultegra CS-6700
The RD6600 will only handle a 27T gear so no to 11/28.
The RD6700 will handle the 28T gear so yes to 11/28
The ST6600 will work fine with the RD6700.
The ST7900 should only be used with other 7900 products (Dura-ace for Dura-ace) it will work but not as nice.
There is no need to change your shiftlevers.
The ST7900 is almost fully compatible, in that any Shimano Derailleur will work with any Shimano Shift lever, However the ST7900 has a slightly different shifting pattern and the shift levers should only be used with other 7900 products to get the best performance.
Side note - If you are using standard cranks now, you could keep your shifting in tact and change your cranks to compacts and get lower gear ratios than moving to the 28T for a similar price to Rear derailleur/ cassette and chain plus labor. This is a common change in my shop.
Posted on Apr 07, 2011
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Posted on Jan 02, 2017
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