when I removed the side cover to retension my belt I also noticed a little bit of rubber fragments, it appears the edge of the belt was just touching the cover or the other side.
It was not much so I don't think it is an issue.

When you remove the cover, does it look like the belt is user replaceable? I always wondered about the belt breaking...

Yes

yeah it does sit towards the side of the cassette - it almost looks like there is a piece damaged under the belt - doesn't prevent the use - I just wonder if it will keep wearing down until it's gone. Makes a bit of a mess of rubber dust.

my belt just snapped a few minutes ago... very uynhappy bunny here! and there seem no way to find replacement part or articles about them on the web.... anyone knows about this? Or the belt schematics?

Contact Wahoo, they will send one for you,
I bought one from this company as they took a few days to respond to my email
same belt.

http://www.andymark.com/product-p/am-2570.htm

Thanks I have emailed them and also ordered a couple of spare belts online. What I wonder is whether it was a one off incident due to a less than perfect belt tension from the outset or a recurrent wear and tear thing ....
How many hours had you pout on the Kickr when yours snapped? Did it ever happen again?

Mine busted because I was tightening it in order to trick the kickr into recording the proper power output as they are notoriously 20-30w off.

I have mine pretty loose now as I use the trainerroad ant+ power meter control instead.
I have spindown of around 22 secs which gives a nice road feel too.

Thanks for the input. How does the TrainerRoad controller resolve the issue of the Kicker being 20-30 Watts "softer"?

the issue is that the kickr reports higher wattage than what is actually being produced by you or the electronic resistance of the unit.

trainerroad fixes this issue by using your powermeter as the measuring device instead of the kickr and it uses those figures to
raise/lower the resistance of the kickr accordingly. Works well.

you need to have an ant+ power meter though.

Andymark! They're primarily a robotics supplier for high-school-level robotics competitions. Very strange seeing them here. If you need to build yourself an electronic trainer from scratch, you can probably find the parts to do it there :-)

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STAC Zero Trainer - Zero noise, zero tire contact, zero moving parts. Suffer in Silence starting fall 2016

Thanks Lenny, makes sense and great tip!

http://forum.slowtwitch.com/...t_reply;so=ASC;mh=25;

Dang, I thought I had followed your directions carefully enough by pre-loosening the belt before adjusting it, but I guess not. My belt just broke after many months and miles of happy use. I don't feel like it is quite fair to make Wahoo pony up for a replacement, so wanted to double check that the one you linked to here from andymark worked out for you. Any trick to installing it, or is it straightforward? Thanks in advance.

yes, working very well.
Still have the one Wahoo sent as a spare.

It is pretty straight forward to install you will need to loosen the tensioner.

Has anyone tried a different brand of belt? This one has good reviews and looks compatible:

http://www.amazon.com/...p;smid=ATVPDKIKX0DER