No rain during 4 days in France : no problem.
But today, rain was back… and the belt went off.
I analysed and I think I understand the problem.
The snubber seems not to be centered, and when it is rainy, some dirty elements from the road are sticking on the belt. Then the belt and these elements touch the snubber more firmly, and the belt goes to the space on the left.
Hi, is the snubber bearing centered on the freewheel?
It looks to me the belt is not centered on the freewheel. A quick check of the Stridas I have in stock most of them the belt is not centered with the belt running closer to the inside edge of the freewheel. It looks to me from your photos your belt is running closer to the outer edge of the freewheel.
Assumed that there is in fact no seal I’d think that all those little steel balls - which are most likely very close to the gap - are still more or less intact, but their diameter is smaller than it should be.
Maybe…but let’s see what’s the difference with a new one…
Yes, absolutely Ok.
(This part is intended to keep the correct distance between inner and outer bearing.
As the hole in the center of the hub is not recessed the bearings might move together once there is force applied to the wheel bolt.)
You’re right, tightening just by hand is also Ok.
(Each time you pedal you’ll also tighten the freewheel harder - that’s why it’s so hard to get it off.)
Have you checked the belt tension? It could be loose.
You don’t need to tighten the freewheel as it tightens when you pedal but it would help if you put grease on the hub threads before putting the freewheel back so that it would be easier to remove later on. Trust me, I’ve tried it and it took me just a couple of hits on the lever of the tool to loosen the freewheel.