Climbing groupset for Tongseng TSDZ8 750W

[E-HP]

"It's down to frame design"

Indeed. I will only know when I install everything.
The stock 44t has about 16mm of offset and the 38t from ebikestuff.eu has 11mm
I need to correct for 5mm. Not sure how thick is the BB spacer they provide, but
I hope I will not have to use it.

Bafang used to have a pattern you could print out to see what the chainline would look like. I didn't see anything like that for the TSDZ8, so you get to be surprised. Hold off until you do the test fit before planning around it.

 

[E-HP]

"It's down to frame design"

Indeed. I will only know when I install everything.
The stock 44t has about 16mm of offset and the 38t from ebikestuff.eu has 11mm
I need to correct for 5mm. Not sure how thick is the BB spacer they provide, but
I hope I will not have to use it.

The problem with the BB spacers is that you soon run out of room or threads for the locknut. Luckily the old Treks had 68mm bottom brackets, so you have some leeway compared to frames with a 73mm BB.

 

[hgg]

From some installation videos I saw, the 44t touched on the frame on many bikes, so it looks that its
quite close to the frame, which is good, because the 38t would be even closer and might be fitted
without a spacer.

I want to avoid BB spacers, not to install them and at the same time to add one on the cassette.

 

[dgc]

On my Boardman full suspension frames, due to the rear swing arm pivot point design the chain wheel is inline with / inside the outer of the swing arm so not far off the position of a normal chain wheel setup, hence the reason I can use all 9 gears. But of all things I could not do this with the Boardman hard-tail I have which is the same age frame as the frame is in the way of the chain wheel.

 

[n00b]

I run the Sram X4 Long cage rear derailleur with a Sram X5 trigger shifter with a 9 speed 11 - 46t cassette along with a derailleur hanger extender. Do use the Shimano derailleurs on my other bikes but due to an alignment problem on my latest bike which is a 29er the X4 just worked straight out on the box, must say I also like the X5 shifter. I do normally use the 11 - 42t and the 11 - 46t cassettes as I do ride mainly on the flat but do go up / try to get up 45 degree banks or thro' the forest where there are short steep climbs but as before use hanger extenders.

I've broken 2 of those.
Been using Shimano "CUES" long cages with a derailleur extender.
1 of those SRAM X4s didn't make it halfway down the block.
Broke the springs in both really fast.