If you have an 11-32t or 11-34t like mine you are in for a hill climbing eye-opener when you move up to an 11-42T wide range cassette. But I did say you could have it all in the title above didn't I? Indeed you can if you upgrade to a wide range cassette. This you do at the expense of your low gears for climbing. The 10 or 11 tooth high gear you have on your cassette is as high as it goes so if you want speed and a higher gear the only lever you have to play with is the front chainring. These are great for climbing but at the expense of speed and chain line below 42t. Hence, we see the single track and San Francisco crowds putting on 42 tooth and smaller chainrings like the Luna Eclipse or Lekkie all the way down to the 30 tooth Luna Mighty Mini. If you stay with the 46 tooth chainring that comes on the BBSHD or put an even bigger one on it you can bog the motor down on steep hills even in the lowest gear. Because of the architecture of the BBSHD chainrings smaller than 42 teeth tend to mess up their chain line. People with steep hills to climb are putting small chainrings on their BBSHD. If you want to climb hills you get a small one. If you want to go fast with a comfortable cadence you get a large chainring. This means your 27 speed is now a 9 speed. These motors have a single gear up front requiring us to sacrifice our front derailleur and 2 or 3 chainrings to a single chainring. However despite these great benefits most mid-drive motors require a huge sacrifice over hub motors.
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