The specs are in the service manual, and we have sworn to Triumph to never divulge that information, sorry.
Front Axle; 65 Nm
Axle Pinch Bolts: 20 Nm
Be vigilant that the speedometer sensor magnet notches and the steel ears on the wheel match up perfectly, as it is very easy to crack the sensor magnet if you get them bound up. The same goes for the sensors case notch and the nub on the outer fork tube. Also, it's a good idea to smear a coat of grease on the axle, including its threads, and on the bearing seal surfaces before installing the wheel.