I have put new lifters on my ski boot soles and routed the toe lugs to 20 mm and heel lugs to 31mm, the MAXIMUM allowable under ISO 5355 which as you know is the DIN Standard for ski boot soles. ISO 5355 specifies a toe lug height of 19mm plus or minus 1mm and a heel height of 30mm plus or minus 1. I reasoned that machining the lugs to the maximum height would allow me 2 mm of material in case I wanted to adjust the plane of the sole and provide a firmer grip by the bindings. The toes are for sure wedged firmly into my Look bindings but the release when compared to a pair of boots with toe height at 19 mm height seems a bit sticky.
Do you guys trim to exactly 19/30 or do you think I'm safe to leave it at 20/31. I have very precise measurement tools so I am confident of my readings.
By the way I took this project on myself because one of the best race shops in my area machined my last pair of boot heels to 27mm after installing cants and lifts.
Your comments please.