http://www.sram.com/_media/pdf/service/PowerLock.pdf

SAFETY RECALL
SRAM PowerLock® Bike Chain Connector
PowerLocks® with date codes M or N can break and cause the chain to detach.

PowerLock® connectors were sold:
1.) By themselves from January 2009 through August 2009.
2.) With SRAM 10-speed bike chains (PC-1030, -1050, -1070, -1090, and -1090R)
from January 2009 through August 2009.
3.) As original equipment on some Guru, Surly, Salsa, BMC, Serotta, Seven, &
Ridley brand bikes from April 2009 through August 2009.
If your bike has an affected SRAM PowerLock®, stop riding it immediately
and return the PowerLock® to a SRAM dealer for a free replacement.
For more information or for assistance, contact SRAM at

Ah fleck…..trundles down to the cellar and checks.
I think at least 2 of my chains have them, started on KMC for the last couple

I take they’re thinner than the 9 speed?

All clear! Thanks for the heads up!

Plop!! Both my chains have an M clearly stamped on them. 🙁 Thankfully no need to worry too much as I’m more of a Roadie at the moment. 😀
Will be emailing them though.