3 hours and nearly 25 miles and very cold... perfection with 5/6 PSI on the the new Surly Lou and Bud tires. Island Lake with lite snow and about 70% ice was still fine without studs and low PSI - really fun and I wanted more... so off to Milford for 2 more loops which were even better with frozen dirt = slickrock. Great grip and really pretty fast. Loved this 5 mile single track - its small but has good flow and lots os tech sections and up and downs. Must do this combo again soon.