My wife temporarily needs a easier climbing gear for a hilly ride next month. Is it possible to take the 11-32 9 speed cassette and derailleur off of the MTB and put it on the road bike? Ultegra-10 STI shifters /compact crankset. The largest 10-speed cassette I have found to date is 12-27, she may need more. Iw ant to find a way to give her the most "bail out" gearing without switching to a triple. Thanks in advance.