With respect to studded tires here's my guideline for stud length in for the 2017 series:
- 1.5mm studs - if you would like to also use the tire on the street
- 2.5mm studs - if you plan on using the tire over multiple seasons of ice racing
- 3.5mm studs - if you absolutely want to have the best possible performance but are willing to accept that the studs may bend and become "longer" as a result; i.e. tires that may have been legal at the start of the day could be subject to disqualification later in the day. The tire will progressively start throwing studs after year 2.