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Belt twisted twice

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Re: Belt twisted twice

Post by Blackstridaaustria on Tue Jan 07, 2014 1:37 pm

Well, beginning at the brake rotor...
Unfortunately can a common brake rotor (without heavy mods) not be used, you will need an original brake disc.
At this opportunity to order spare parts you might also take a closer look at the snubber bearing, the 338 part (magnet spacer) and of course the freewheel.
The rear rotor is clamped by the freewheel, a special tool Tis required to remove it - do you have such thing?
As always, I'd recommend the purchase of a hook key A for proper belt tensioning
For convenient belt changing you might use the step 13 of this thread.
(There should be also a few hints for belt, snubber and rear brake caliper un/remounting :wink: )

Did you already check the local parts availability?

Re: Belt twisted twice

Post by ilciavo on Tue Jan 07, 2014 8:43 am

After 2 years riding in the snow and rain the belt also twisted and torn.
Initially, I though it was due to excessive torque, so I could manage by avoiding steep slopes.
Now I need to replace my broken belt and it seems that I need to adjust the tension after getting a new belt.
I don't know exactly how to do this, additionally my rear disk is also bent.

Re: Belt twisted twice

Post by Blackstridaaustria on Sat Apr 13, 2013 1:52 pm

:lol: yes!

Re: Belt twisted twice

Post by stridahd on Sat Apr 13, 2013 1:46 pm

Thanks. They are even available with reasonable prices in the famous internet book store :)

Re: Belt twisted twice

Post by Blackstridaaustria on Sat Apr 13, 2013 11:50 am

Re: Belt twisted twice

Post by stridahd on Sat Apr 13, 2013 9:50 am

Interesting photographs :)

stridahd wrote:After approx. 2 years and 3.000 km the belt of my Strida...


You also have to add the fact that I am not lightweight and I used it throughout two winters without much cleaning.

PS: I fixed my break problem for now. The brake pads were worn and I had to adjust them. However I guess I will need some new within this year. Any suggestions for a shop with reasonable prices?

Re: Belt twisted twice

Post by Blackstridaaustria on Wed Feb 27, 2013 1:15 pm

Bietrume wrote:Wow, it wears very quickly (only 1000km!)


No Bietrume, that's a misunderstanding...sorry, my fault...

The above shown freewheel is stridahd's first one, the one we've changed together with Mike.

stridahd wrote:After approx. 2 years and 3.000 km the belt of my Strida...


But, in fact, 3.000 km are also not that much...

Bietrume wrote:Is it a visual effect...


Indeed, yes, here's a similar pic, taken 90° to the left of the cam position before:

Image

Re: Belt twisted twice

Post by Bietrume on Wed Feb 27, 2013 11:14 am

Wow, it wears very quickly (only 1000km!). Ming Cycles should definitely improve the freewheel design: better surface hardness and better sealing/friction of the bearings.

Is it a visual effect or is the outside diameter of the new freewheel really bigger than the OD of the used one (look at the size of the flanges)? I
f this is the case then the number of teeth is not similar :?:

Re: Belt twisted twice

Post by Blackstridaaustria on Tue Feb 26, 2013 6:05 pm

For comparison, stridahd's freewheel next to a brand new one:

Image
1600 x 1200

Image
1200 x 1600

Image
Image

Re: Belt twisted twice

Post by stridahd on Wed Dec 12, 2012 3:31 pm

Long term feedback: No belt problems since the repair service in Vienna.
As I use my Strida about 11 km per working day - This means about 1.000+ km.

Now I'll have a problem with my rear break, but this is another story and yet to be investigated.

Re: Belt twisted twice

Post by one_half_3544 on Thu Oct 18, 2012 4:16 pm

Yes, #338 part is ok.

Re: Belt twisted twice

Post by Blackstridaaustria on Wed Oct 17, 2012 8:36 pm

...and you're sure that the 338 part (magnet spacer) is still OK?

Re: Belt twisted twice

Post by one_half_3544 on Wed Oct 17, 2012 7:23 pm

one_half_3544 wrote:1. replace #338 and leave the current belt - to see if it will continue to twist. After it snaps/twists/exhibits some other abnormal behavior, I'll:
2. replace the belt and see if it twists (with new part #338, but old freewheel).


Ok, the belt still twists with new #338 part (3 times in a row today!), so now I'll replace the belt with a new one.

Re: Belt twisted twice

Post by Blackstridaaustria on Mon Sep 17, 2012 9:52 am

According to Ming's customer support the torque should be 6-8Nm.

Many thanks to Sara for the fast reply!
Image

Re: Belt twisted twice

Post by Blackstridaaustria on Sun Sep 16, 2012 9:26 pm

one_half_3544 wrote:Did you check it immediately after tightening or after riding?
Could it be that is it damaged not by tightening, but by the wheel movement?


On the black Strida I've destryoed the 338 part definitely by too much force -
I've mounted the wheel and wondered, while tightening the bolt, that it didn't become firm.
Therefore the bolt was unscrewed again and I saw the deformed 338 part...

On the silver Strida I'm not 100% sure, but I believe it was the same reason.
I guess that any force, applied to the wheel via the tyre in axle direction, should be absorbed by the wheels flexibility.

one_half_3544 wrote:I've replaced #338 part and tightened #379 bolt with 5Nm torque - #338 part still looks good after unscrewing =) Will see what happens after riding though..


Hmmm, here I'm also unsure, sorry, but I think that the very gently tightening will be below 2 or 3Nm.
2Nm are the lowest amount which can be set on the BBB torque wrench, I do not trust the wrench at this range limit...
I'll try to figure out a safe torque amount asap...

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