Tyre Y in telemetry

Does anyone know what the Tyre Y telemetry output is? I’ve tried to figure it out, but I can’t seem to figure out a good answer. I’ve thought about tyre compression, but I can’t correlate that to something so please help

 

Might be tyre skew

 

Is that toe? If not, please explain

 

I can tell you that it isn’t that

 

Maybe wheel loads

 

I don’t think so since it’s a length.