I recently bought an Easton EC70 SL wheelset with a shimano 11-23 cassette for racing. I use Mavic Open Pros with Ultegra hubs and an 12-27 shimano cassette for training. The ultegra hub does not require the 1mm spacer between the cassette and the hub because my rear derailleur will not shift to the smallest cog. Without the spacer, it goes onto the last cog without problems. However, the Easton hubs require the 1mm spacer because there is play between the cassettes without it. Now, I cannot shift to the 11t on my racing wheels. Does anybody have this problem? It has nothing to do with the limit screws because I already tried setting the H limit and it did not help.