So what you need to do to follow the same principal is find a rear cassette with as many teeth as possible top gear and a similarly as many as possible bottom gear combined with an up geared (more teeth) front chain ring. It might be easier with a 10 speed system. Although it seems a bit expensive to me EddiePJ recommends the Sunrace MX3 10 speed cassette with a 42 tooth bottom gear. This low bottom gear would allow you to over gear your bike with a large front chain ring but still have a low enough gear to climb very steep hills off road.
In truth the only time that I ever venture onto the 42t is when either riding unassisted, or out of desperation when in the Alps.
As you can see from this shot, even after the best part of several thousand miles of use, the 42t has hardly had any use. In reality it wouldn't be a great loss if I had to switch back to a 36t set up. I do rate the quality of the SunRace cassette though.
