I have had a 3x10 drivetrain since May and have been through 2 XT chains since then.
The first one snapped and I put it down to crap installation on my part (something I haven't ruled out for the second).
It snapped whilst riding, I fixed it and it snapped again and again. After losing so many links the chain was then too small so I had to get another.
It has lasted till now (about 20 rides) but last night snapped after a steep climb. Fix, snap, fix, snap, fix, snap.
I made the stupid mistake of big ring little cog before which probably resulted in the weakness for the first snap but I have never had issues of an many breaks on the same ride before.
What am I doing wrong? Is there a technique to reattaching the chain that is different to a nine speed? I have noticed that when I push the pin out of a link to then re attach the chain a small metal washer is left on the end of the chain tool after extraction. Is this normal or do I need a new chain tool?
Is there a special technique to fixing 10 speed chains or are they just inherently weaker than 9 speeds due to their reduced width?