Less than 20F is sub optimal for a 17 mile commute. Is your plus a 27.5 ? 3" studs available from 45 north. Keep your head, hands and feet warm, the rest will follow. Really warm boots, plus those heating foot warmers for backup, very nice. Got places to seek shelter/warm up if needed? And studded tires, all the time during winter. Hit that one ice spot last year from taking the studs off a week too soon. Full on left body slam, elbow tucked under, wind knocked out, again sub optimal. Took 10 minutes to walk that one off after lying on my back writhing for 5. No lasting issues except for some bruises to body and ego.