So I've been interested for a while in a power meter option for Sram XX1. I have a power meter on my road bike and used a Quarq S2275 MTB power meter on my 29er last year. I am now running a XX1 drivetrain and the S2275 was not compatible so I sold it on Ebay a few months ago. SRM has a couple of XX1 options out but they are very expensive ($2,500 ... yikes!). I sent a note to Quarq several months ago inquiring about the possibility of a XX1 power meter (given Sram bought Quarq) and they confirmed they had one under development but no release date. Have been checking their website periodically but so far no news. I googled the topic again today and stumbled across this: XX1 Power Meter Help . Qalvin is Quarq's calibration / diagnostic software. Curious ... it appears to be instructions for an XX1 power meter .... perhaps a release in the near term??? Anyone on the XC Racing and Training forum train with power?