The Iditarod Trail Invitational is the world's longest winter ultra-marathon.

Steve McGuire (University of Iowa Professor) and Judd Rohwer finish the ITI 350 on single-speed bikes. Well done, guys!

According to the ITI Live Tracker, Steve finished in 7 days, 17 hours and 20 minutes.

Steve (60 years old) finished on a special bicycle frame that he built specifically for the event. Be sure to check out the other News BIKEIOWA has posted about Steve in thee past regarding his bike building.

One of the most challenging experiences on the planet, participants brave extreme physical, environmental and mental challenges as they work their way along the historic Iditarod Trail on bicycle, foot or skis.Requiring self-sufficiency and the considerable resilience to make it through up to 30 frozen days and nights, the Iditarod Trail Invitational has built its reputation on notoriously inhospitable conditions and minimal outside support.

With jagged mountain ranges, bone-numbing temperatures and minimal support, the ITI 350 forces competitors to reach deep within themselves to persist while being besieged by relentless physical and mental challenges.

The ITI follows the historic Iditarod Trail from its trailhead at Knik Lake near Anchorage to the remote interior village of McGrath for the ITI350. The ITI1000 continues to the Bering Sea before reaching the trail's conclusion in Nome.

More about the ITI 350.

Photo Creds: Iditarod Trail Invitational