From their site:
Recommended Tracking Force 2.0gm 〔 20 ゜C-25 ゜C 〕
Tracking Force Range 1.7gm - 2.5gm
As long as you stay within that range, you're fine. I track my Decca and Audio Technica cartridges at the lower end of their range for better air, speed and transient response.