Daytriker said:
Anyone know of a source for the TSDZ2 52 tooth Chain ring & I will be able to give you feedback on the motor performance on a trike.
Re-Cycle doesn't have any to sell. Thanks.
The "original" factory installed gear is a 42T with about a 7mm offset to the inside. This offset reduces how far outboard the chainring is from the bike's centerline. This is important in helping achieve a good chainline - the straighter the better.
Unfortunately, a reasonably sustained effort at finding other offset gears this past summer - just a couple of months ago - led me to conclude that there are no other gears available in this size that have any offset. Rumor has it that there ARE offset gears for other bottom bracket mid-drive units, but our TSDZ2s have a 5 X 110 BCD and these other units have some other specification, and I wasn't looking for them. However, I did find that there are various other spiders to fit other bolt patterns.
This isn't to say you can't run a non-offset gear.
I have a 42T / 52T combination on both my TSDZ2 equipped bikes. In both cases, the 42T is run inboard and has the better chainline while the 52T is outboard. Do note, however, that to do this, I am running an adapter that I made myself that permits the original 42T offset gear to be mounted without disturbing its original position as, at least on my two units, you cannot move the 42T inboard any further than it already is without it coming into contact with the TSDZ2's motor casing (or, actually, the rubber cover that closes off the motor casing).
Both of these dual-chainring TSDZ2 equipped bikes have "build threads", and I made a separate thread to discuss gearing, and the adapter is also discussed there in more detail.
The first, the Raleigh replica (a Legran)... There are some good chainline images - try June 28, 2017 (page 2), and July 27 (page 4),
https://endless-sphere.com/forums/viewtopic.php?f=3&t=88943
The second, a Marin San Rafael Euro - how I got the front derailleur working starts on page 3 with a post dated October 30, 2017:
https://endless-sphere.com/forums/viewtopic.php?f=3&t=89956
The gearing discussion, adapter details on page 1:
https://endless-sphere.com/forums/viewtopic.php?f=2&t=88711
Note that with electrification, there's a lot less need for lower gears unless you have to ride with a dead battery on hilly terrain. Also note that one tends to avoid bad chainline front / rear choices... so I don't often go into the lowest gear in the rear while on the higher gear in front!