My comments
At 81 ft/lbs of rear axle torque, the rotor wheel bearing appears to always feel tight (Not sure if this is an issue??). Why so much torque? I think this high amount is needed to compress the cush drive rubber between the final drive and wheel. I have tried several lower torque settings (along with multiple bearing sets) over several thousand kilometers trying to get rid of an annoying clicking sound (Another story).
With the lower torque value I have noticed that the rotor side bearing remains loose/smooth like new but causes another problem. It appears when a lower torque value is used, there isn't enough preload on the cush drive resulting in my center wheel bearing eventually spinning in the bore of the rim. The center bearing outer race ends up having a slip fit in the wheel. To fix this I replaced all the bearings with Nachi premium ones. The slip fit in the center bearing was fixed using Loctite 638 to prevent the outer race from spinning in the rim. The rotor bearing that is prone to feeling tight after being torqued to 81 ft/lbs, appears to be designed to take some side load. With this in mind, I retorqued the axle to Triumph spec several thousand kilometers ago with no issues. We will see if the bearing is tight next tire change.
I really wonder if the bearing becoming tight is an issue because as soon as it is knocked out of the rim, it feels fine.
vxb.com is where a number of us purchased ours. The C3 bearings have a higher load rating. You would need 1 of each bearing listed below for the rear wheel.