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June 20-21, 2015

Middleville, Michigan 

A personal best, on-road bicycle ride - to test endurance and determination.

The National 24 Hour Challenge
has been held every Father's Day Weekend since 1983. 

Riders have come from most every state,
as well as more than a dozen foreign countries.

Set your goal, Join us, and achieve it!

The N24HC is a UMCA Ultracycling Cup Event

Recent Announcements

  • 2015 - We are a UMCA World Cup Event! For 2015, UMCA members will be eligible to win a UMCA World Cup Championship jersey at the National 24-Hour Challenge.  Jerseys will be awarded to the overall high-mileage ...
    Posted Mar 20, 2015, 7:34 PM by Pete Steve
  • 2015 Taillight Rules Because of the configuration of our night loop, a single blinking taillight could become  a hazard.We require at least one constant-burning taillight, affixed to the bicycle.An additional ...
    Posted Dec 7, 2014, 4:28 PM by Pete Steve
  • Rapid Wheelmen Training Rides (2015) Our friends in the Rapid Wheelmen bike club arrange a series of spring rides ideally suited for N24HC training.May 2, 2015:  Dawn Patrol Special Edition - Dawn Patrol is a ...
    Posted Mar 23, 2015, 3:32 PM by Pete Steve
  • New Sponsor - Welcome Aboard! We're pleased to announce a new sponsor: Northpointe Bank in Grand Rapids.Northpointe Bank strives to bring value to customers by offering client-focused financial products and services.They ...
    Posted Dec 7, 2014, 7:20 PM by Pete Steve
  • Proposed Change in Place Calculation N24HC Riders: The N24HC is contemplating a change to how places are assigned that will bring us more into line with the rest of the sporting world. In a short ...
    Posted Jan 8, 2014, 2:16 PM by Pete Steve
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