TSDZ2 - how necessary is the fixing block?

[d-s-m]

I've fitted the TSDZ2 kit to my bike, but had to leave out the fixing block due to the design of the bike. So that has caused the motor to work it's way higher up the downtube, rather than under the bottom bracket. Is there any reason I shouldn't have it like this? As I prefer it that way, as there's less chance of the motor getting hit by a rock or log...etc. Just need to pack it out a bit with some rubber to stop the motor making contact with the downtube, but so far I'm not seeing a reason to not use the fixing block. Am I wrong?

 

[d-s-m]

Bump - this is the fixing block I'm referring too incase anyone is not sure:

 

[peter.c]

The motor will work loose and require constant attention , had to make another anti turn bracket to replace this on a full suspension build

 

[TJS109]

You will definitely have problems if you don't do something. I don't see any problem with what you have done (rotating the motor clockwise and allowing the casing to rest on the downtube) and am sure I have seen other examples of that fixing.
I find that even when fixed the locking ring can loosen and needs loctite to secure it

 

[TJS109]

Just noticed this thread

TSDZ2 motor casing cracked

So I went out for a ride on my TSDZ2 converted bike today, and immediately it was making a terrible noise, so had a closer look and noticed this large crack right across the motor: Is this salvageable at all? Or do I need to bite the bullet and buy a new one?

www.pedelecs.co.uk

Might be worth asking if it was mounted with the frame touching the down tube

 

[d-s-m]

That thread was also made by me, ironically only a few days after I'd made this one!

 

[wheeliepete]

I'm not familiar with using this motor, but here's my thoughts. It has obviously been designed to need that rear mount to spread the loads created by the torque loads on the casing, or it would not be there. Without it, the load is increased on the casing around the bottom bracket tube, making it prone to failure, made far worse if the motor works loose. I think this is what happened to the motor on the thread above. If you keep the BB mounts super tight, then you prob. stand a chance of avoiding failure. The Bafang BBS mid drives does not have this bracket, but the casing in that area is at least twice the thickness.

 

[vfr400]

That thread was also made by me, ironically only a few days after I'd made this one!

How did it break? Did you hit something or did it break while pulling away in a high gear? That's important to answer your original question.

 

[d-s-m]

How did it break? Did you hit something or did it break while pulling away in a high gear? That's important to answer your original question.

It looks like when the motor has been pushing up against the downtube, the raised bolt hole part which attaches the lockring plate has been making contact first, rather than evenly spreading the load across the downtube, which has created a lever point and thus eventually causing it to crack.

 

[Deleted member 16246]

If a manufacturer goes to the trouble of making a mounting plate to manage torque, there is a good reason for it, or they'd have saved some money and left it out.

 

[d-s-m]

If a manufacturer goes to the trouble of making a mounting plate to manage torque, there is a good reason for it, or they'd have saved some money and left it out.

I saw that other people who had installed the kit had left that mounting plate off, so I figured that I could also get away with it.