TSDZ2 or a BBS02 on my FS mountain bike....

[lander]

I've got a great bike with FS and I wanted to put a mid drive on. After tons of research, I discover, The TSDZ2 needs a clearance diameter of 65mm clearance for the round housing. The best i can gather, for a BBS02, that distance is 59mm? Any help here? Spacers available? or is this just have to be a rear hub?

 

[peter.c]

My thoughts and cut knuckle's tend towards the bbs what make/brand is the frame

 

[lander]

My thoughts and cut knuckle's tend towards the bbs what make/brand is the frame

trek Fuel 90. I'm even questioning the Bafang at this point. i don't think 59mm would work either.

 

[peter.c]

After a quick google is it similar with the kona fs of the time which shared likeness with a carrera banshee both of which will take a tsdz2 or bbso2 with ease please post a pic [side view]

 

[lander]

After a quick google is it similar with the kona fs of the time which shared likeness with a carrera banshee both of which will take a tsdz2 or bbso2 with ease please post a pic [side view]

if the motor sits flush to the black metal, I dont see how a tdsz2 could fit, if the clearance is 65mm. The best !'ll get is 55mm. That blue print of the BBS02 i posted has a diameter of 117.x mm which leaves a clearance minimum of 58mm. I'd hate to do all that work and be foiled by 3mm. Heres a video of a TDSZ2 that just made it. I think i'm in the class of "sorry, out of luck". @ 7:25 he's shows how fis barely clears. and a graffic showing the 65mm hurdle.

If you think it'll fit i'd love to hear why. This is a way bigger rabbit hole than i expected haha. Thx for the help

 

[peter.c]

What size is the triple chain set the rear of the motor is not flat but dished top pic is a salsa bottom is a fs mutha
ps they make bb spacers 1mm upwards to pack it out very rarely required

 

[jarob10]

Speaking as a bbs02 owner, that chain stay clearance does look marginal, even allowing for the use of spacers.

As you suggest, a safer bet would be a geared rear hub - don’t make the mistake that this is a compromise, because Kw for kw it’s just as good. I’d personally go that route, and focus your energies on figuring out how to fit a downtube battery