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I used to ride an Ultegra 9 but "upgraded" to Ultegra 10 kit. The chain was worn after only 600 miles. Plus I needed help climbing and Ultegra only came in 12-27 cassette (I had a 12-23) at the most and I was using a compact crank. So, I switched out the cassette for a SRAM 11-28.
The SRAM cassette has a huge bridge so sometimes my chain would dump, expecially when rapid shifting from the big cog to smaller cogs in the rear. I miss my old bike with triple crank and Ultegra 9 kit.
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