Ultegra cassette with Sram x.9 twisters/derailleurs?
Is this do-able, and if so, is there a recommended Sram 9-speed chain to help marry up the shimano cassette to the Sram x.9 rear derailleur? There appears to be five different Sram 9-speed chains on the market, so would one chain be preferred ... if ... you can use a Sram derailleur with a Shimano cassette?