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Online Registration Deadline: Monday, Aug 7, 2023 at 10:00 PM CT

Select Your Category

Category Start Time Distance Field Limit Fee
100 Mile Youth 17 & Under FREE $0 7:00 AM 100 miles $0
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack.
    Category for Youth 17 and under on race day.
100 Mile Women 39 & Under $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Category for Women ages 39 and under on race day.
100 Mile Women 40-49 $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Category for Women ages 40-49 on race day.
100 Mile Women 50-59 $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Category for Women ages 50-59 on race day.
100 Mile Women 60 & Over $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Category for Women ages 60 and over on race day.
100 Mile Men 39 & Under $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Category for Men ages 30-39 on race day.
100 Mile Men 40-49 $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Category for Men ages 40-49 on race day.
100 Mile Men 50-59 $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Category for Men ages 50-59 on race day.
100 Mile Men 60 & Over $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Category for Men ages 60 and over on race day.
100 Mile Non-Binary 39 & Under $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Caterogry for Non-Binary ages 39 and under on race day.
100 Mile Non-Binary 40 - 49 $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Caterogry for Non-Binary ages 40 - 49 on race day.
100 Mile Non-Binary 50 - 59 $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Caterogry for Non-Binary ages 50 - 59 on race day.
100 Mile Non-Binary 60 & Over $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack. Caterogry for Non-Binary ages 60 and over on race day.
100 Mile Single Speed $105 7:00 AM 100 miles $105
  • Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack.
100 Mile Fat Bike (3.5"+ Tire) Category $105 7:00 AM 100 miles $105
  • Fat Tire Bikes only, must have 3.5" tires or wider.
    Approximately 30 miles of pavement, 50 miles of gravel, 20 miles of singletrack.
100 Mile Three Person Team Women $105 7:00 AM 100 miles $105
  • Teams take off with mass start riders but must finish as a team. Last team rider across the line sets the finish time for that team. $105 per Rider
100 Mile Three Person Team Coed $105 7:00 AM 100 miles $105
  • Teams take off with mass start riders but must finish as a team. Last team rider across the line sets the finish time for that team. $105 per Rider
100 Mile Three Person Team Men $105 7:00 AM 100 miles $105
  • Teams take off with mass start riders but must finish as a team. Last team rider across the line sets the finish time for that team. $105 per Rider
50 Mile Youth 17 & Under FREE $0 8:00 AM 50 miles $0
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack.
    Category for Youth 17 and under on race day.
50 Mile Women 39 & Under $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Women ages 39 and under on race day.
50 Mile Women 40-49 $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Women ages 40-49 on race day.
50 Mile Women 50-59 $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Women ages 50-59 on race day.
50 Mile Women 60 & Over $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Women ages 60 and over on race day.
50 Mile Men 39 & Under $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Men ages 39 and under on race day.
50 Mile Men 40-49 $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Men ages 40-49 on race day.
50 Mile Men 50-59 $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Men ages 50-59 on race day.
50 Mile Men 60 & Over $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Men ages 60 and over on race day.
50 Mile Non-Binary 39 & Under $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Non-Binary ages 39 and under on race day.
50 Mile Non-Binary 40-49 $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Non-Binary ages 40-49 on race day.
50 Mile Non-Binary 50-59 $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Non-Binary ages 50 - 59 on race day.
50 Mile Non-Binary 60 & Over $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack. Category for Non-Binary ages 60 and over on race day.
50 Mile Single Speed $105 8:00 AM 50 miles $105
  • Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack.
50 Mile Fat Bike (3.5"+ Tire) Category $105 8:00 AM 50 miles $105
  • Fat Tire Bikes only, must have 3.5" tires or wider.
    Approximately 5 miles of pavement, 37 miles of gravel, 8 miles of singletrack.
50 Mile Three Person Team Women $105 8:00 AM 50 miles $105
  • Teams take off (time trial style) in 1 minute increments. The team rides the route together, stopping at checkpoints to gather their "proof" and then they must finish together. $105 per Rider
50 Mile Three Person Team Coed $105 8:00 AM 50 miles $105
  • Teams take off (time trial style) in 1 minute increments. The team rides the route together, stopping at checkpoints to gather their "proof" and then they must finish together. $105 per Rider
50 Mile Three Person Team Men $105 8:00 AM 50 miles $105
  • Teams take off (time trial style) in 1 minute increments. The team rides the route together, stopping at checkpoints to gather their "proof" and then they must finish together. $105 per Rider
25 Mile core4 Crew Ride Youth 17 & Under FREE $0 9:00 AM 25 miles $0
  • Mass Start fun ride for all to enjoy. Join the Crew! Approximately 25 miles of pavement, gravel, and b-roads.
25 Mile core4 Crew Ride $50 9:00 AM 25 miles $50
  • Mass Start fun ride for all to enjoy. Join the Crew! Approximately 25 miles of pavement, gravel, and b-roads.
Friday and Saturday Night FREE Camping! $0 3:00 PM 200 $0
Volunteer! Keep me in the loop on how to help with core4! $0 see event details $0
  • Volunteer options include course setup, packet pickup, checkpoints, course crossings, Wilson's setup/teardown, and much more! Sign up to volunteer and we will contact you with options.

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core4 T-Shirt - $25

Unisex Tri-blend T-Shirt

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Location & Contact

Location address:
4823 Dingleberry Rd NE, Iowa City, IA  52240
Event Website
http://www.core4.bike
Contact Us

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