36 chain ring 11 x 36 cassette 48v batt. 4 thous. miles one chain and cassette replace. Bullet proof build. I run 3.8 speedsters most of the time. I`m in the south no snow. I have run 4.00 x 26 knobbies that just fit. You should run 42 chainring to take advantage of the offset. I find Luna`s 42 to work best as it has the most offset. Not plugging Luna here but they make the biggest offset I know of. I break the cassette stack down to 6 cogs on wide builds. No need for half stepping with a motor. Just my experience. This bike will run and pull like a raped ape. The BBSHD is quite a beast.

When you break the cassette stack down to 6 cogs how do handle the shifting? Do you modify the shifter or does it simply need to "skip" through the shifts that aren't enough to move it to the next gear? Also, how do you do that?

Finally, I really want a cadence sensor so I was looking at the ToSeven setup - I do want to pedal. I would like to just copy something that works so the BBSHD is attractive. Seems like you have a lot of experience. Have you seen/tried the ToSeven setup? Do you think the same chain ring is the way to go witht he Luna (not even sure if that is available for a different motor and what the measurements would be).

When you modify the cassette you will just eliminate some of the cogs. I usually take out the smallest and one or two of the medium sized that are only one or two teeth count difference. Use the same spacers as to not upset the shifter throws. Shim the whole cassette out towards the outside to obtain proper tightness when installing the locking nut on the cassette. Set the low and high stop points on the derailleur. This should improve your chain line.