Fat Bike Birkie

Saturday, March 8, 2025
Big Fat 47K / Half Fat 21K / Fun Fat 10K
American Birkebeiner Trailhead, Cable, WI

The Big Fat 47K Race • The Half Fat 21K Race • The Fun Fat 10K Tour

The Fat Bike Birkie is North America’s premier on-snow bike event. Riders test their skill and endurance on the professionally groomed American Birkebeiner Ski Trail, with options for every rider’s ability level. Choose from three epic distances: the Big Fat 47km race, the Half Fat 21km race, and the Fun Fat 10km Tour. And the fun doesn’t stop after the finish lines – test equipment at the Birkie Fat Bike Expo and enjoy live music and food at the post-race party!

Fat Bike Birkie is an Open-Class Bike Race

The Birkie Trail Staff groomers share the goal of providing a firm surface to ride on for the races. However, course conditions and weather can vary widely, from hard packed to soft powder snow. We recommend that participants be prepared to race in any course conditions. Just like in the Birkie Ski race, Fat Bike Birkie participants are free to choose different equipment based on the conditions of the course. Bikes should equipped with at least 3.5 inch wide tires, suitable to course conditions.

Please note, Class 1 fat bike e-bikes are allowed in the Fat Bike Birkie. At this time, e-bike riders will not be eligible for awards or results placement.

2025 Fat Bike Birkie Registration is Open!

	June 10 through August 29	August 30 through November 7	November 8 through January 30	January 31 through March 7 or until full
Big Fat, Half Fat or Fun Fat	$80	$90	$100	$110

Registration closes on Friday, March 7, 2025 at 7:00pm CST.

All Big Fat 47K participants must be at least 16 years of age on race day. All Half Fat 21K and Fun Fat 10K participants must be at least 12 years of age on race day.

Tandems bikes are allowed but will not be eligible for an individual award category. Each tandem rider must register and contact registration@birkie.com to ensure the proper results are shown.

Register early to guarantee your Fat Bike Birkie t-shirt!

Complimentary race entry with a purchase of $1499 or more at Slumberland Furniture - Click for complete details

Race/Event Change Request

The deadline for requesting a change in race/event distances is Friday, March 7, 2025 at 7:00pm CST.

To change your race event/technique (ALL EVENTS):
- Log in to your RunSignUp Profile HERE
- Scroll down to your event and click on “Manage Registration”
- Click on “Transfer Event” (along both top and bottom menus).
- Then select which new race you want to transfer to and complete new registration. You will be charged any differences and/or associated fees in the final cart. There is a $25 change fee.

Registration Insurance

Protect your Birkie registration! Get reimbursed up to 100% on your registration if you can’t compete for a number of reasons. Fanshield offers Registration Cancellation Insurance so you can insure your non-refundable registration fee in the case of injury, illness, or other unexpected events. Fanshield Insurance can only be purchased during the initial registration transaction, and it cannot be added to an event registration after the transaction has been completed.

Please see policy for complete list of covered perils here.
Limitations and exclusions apply. See terms and conditions.

2025 Birkie Gear Bag

As part of our ongoing Birkie Green initiative, we’ve partnered with SWIX on the Birkie gear bag! The reusable Birkie gear bag is available for $70 and only during registration for the Birkie, Korte, Prince Haakon and Fat Bike Birkie.

During the 2025 registration process, you can claim your own bag for only $70! The $145 value Birkie gear bag is available during the registration process only.
Quantities limited! Register for the race and gear bag soon to guarantee a Birkie gear bag!
Birkie gear bags will be distributed as part of bib pick-up.
To add-on a Birkie Gear Bag (subject to availability):
- Login to your RunSignUp profile.
- Scroll down to your event and click ‘Manage Registration’
- Click ‘Add Ons’ (along either top or bottom menu)
- Change your “Birkie Gear Bag” selection

Birkie Gear Bag Features

The Birkie gear bag has large, heavier zippers and plastic clips throughout the bag.

Reinforced #10 zippers
Tarpaulin panel on the bottom section for waterproofing and greater durability
Bottom wet-sealed compartment for Nordic Boot storage (fits up to size 13 Nordic boot)
Fleeced lined Sports Shield zipped compartment for glasses or visor, with brushed lining to prevent lens scratches and quick, easy access
Large top-load zippered compartment for warm-up clothing, extra hats, and gloves
Two zippered side compartments for extra water bottles and accessories
Inside secured pocket for valuables; mobile phone, keys and wallet pocket
Main pack body is made from tough 600D PVC backed polyester, internal frame-sheet transfers weight evenly and contours to the wearer’s back
Padded EVA foam back offers cushioning and breathability over pressure points, and padded shoulder straps and harness system to distribute weight evenly

Riders will be assigned to multiple start gates based on the last 3 year’s of Fat Bike Birkie results for all races.

The Big Fat (47K) race will feature 4 start gates. Riders will be placed in one of these gates based on their best finish time from the previous 3 Big Fat or Half Fat (21K) races. Riders without a result in the past 3 Big Fat or Half Fat races will be assigned to Gate 4.

The Half Fat (21K) has just one start time and gate.

2025 Big Fat Gate Assignments Based on BIG FAT Results

Big Fat Gate	2023 Big Fat Finish Time	2022 Big Fat Finish Time	2021 Big Fat Finish Time
Gate 1	1:49:57 to 2:06:27	1:50:51 to 2:07:29	1:38:46 to 1:53:35
Gate 2	2:06:28 to 2:31:44	2:07:30 to 2:32:58	1:53:36 to 2:16:18
Gate 3	2:31:45 to 3:06:55	2:32:59 to 3:08:27	2:16:19 to 2:47:54
Gate 4	NEW PARTICIPANTS & PARTICIPANTS WITH NO RESULTS FOR LAST 3 YEARS	NEW PARTICIPANTS & PARTICIPANTS WITH NO RESULTS FOR LAST 3 YEARS	NEW PARTICIPANTS & PARTICIPANTS WITH NO RESULTS FOR LAST 3 YEARS

2025 Big Fat Gate Assignments Based on Half Fat Results

Big Fat Gate	2023 Half Fat Finish Time	2022 Half Fat Finish Time	2021 Half Fat Finish Time
Gate 1	ACHIEVED WITH BIG FAT RESULTS ONLY	ACHIEVED WITH BIG FAT RESULTS ONLY	ACHIEVED WITH BIG FAT RESULTS ONLY
Gate 2	0:51:35 to 0:59:19	0:52:44 to 1:00:39	0:42:40 to 0:49:04
Gate 3	0:59:20 to 1:11:11	1:00:40 to 1:12:46	0:49:05 to 0:58:53
Gate 4	NEW PARTICIPANTS & PARTICIPANTS WITH NO RESULTS FOR LAST 3 YEARS	NEW PARTICIPANTS & PARTICIPANTS WITH NO RESULTS FOR LAST 3 YEARS	NEW PARTICIPANTS & PARTICIPANTS WITH NO RESULTS FOR LAST 3 YEARS

American Birkebeiner Trailhead

All Fat Bike Birkie races start and finish at the American Birkebeiner Trailhead in Cable, WI. Access to the start area is available ONLY from Telemark Road off of WI Highway M. From Cable, WI, Take Highway M traveling East out of Cable for 2 miles. Turn right on Telemark Road.

Follow Telemark Road as it passes the former Telemark Lodge to the designated parking areas. Follow the directions of the parking attendants. The start is accessed via a short pedestrian path.

Friday, March 8

3:00 pm – 7:00 pm — Derksen Family Great Hall

Saturday, March 9

7:30 am – 9:00 am — Derksen Family Great Hall

Friday

1:00 pm – 4:00 pm	Tentative Pre-Ride
3:00 pm – 7:00 pm	Bike Plate Pick-up

Saturday

7:30 am – 9:00 am	Bib Pick-up
9:00 am	47k Big Fat Start
9:15 am	21k Half Fat Start
9:30 am	10k Fun Fat Start
11:00 am – 3:30 pm	Post Race Party!
12:00 pm	Overall Awards
1:00 pm	Age Group Awards
3:00 pm	Finisher Cut-off

Fat Bike Birkie Expo

The Fat Bike Birkie Expo provides riders with an awesome opportunity to test out top-of-the-line fat bike and outdoor lifestyle gear, chat with industry professionals, and collect event swag.

Course Maps

Big Fat

Half Fat

Fun Fat Tour

Course Description

The Big Fat 47K course will ride out on the Birkie Skate Trail to the Powerlines, make a quick turn to the left and rejoin the Classic Trail. After riding on the Classic Trail to OO, the course will return on the Birkie Skate Trail to the Powerlines where it will come into the finish.The Half Fat 21K course will ride out the Birkie Skate Trail to the Powerlines to Timber Trail where it will enter the Half Fat only course. The Fun Fat 10K Tour will ride on a mix of Birkie Classic Trail, smaller ski trails, and the Half Fat course before finishing the same way as the Big Fat 47K and Half Fat 21K races

Aid Stations

Big Fat Aid Stations	Distance from the Start (K)	Cut-Off Time
Timber Trail Southbound	8	10:00 AM
Fire Tower Southbound	14	10:40 AM
Boedecker Southbound	19	11:15 AM
Boedecker Northbound	29	12:30 PM
Fire Tower Northbound	34	1:00 PM
Timber Trail Northbound	38	1:30 PM
Finish	47	3:00 PM
Half Fat Aid Stations	Distance from the Start (K)	Cut-Off Time
Timber Trail	8	10:30 AM
13K	13	11:15 AM
Finish	21	1:30 PM

Learn How to Refuel With Untapped!

[/hidden_content]

Learn how to refuel with Untapped!

Pre-Riding the Course

Stay tuned to find out when and where the pre-riding of the course will happen.

Please note that riding bikes on the Birkie Trail during the winter is only allowed on the days designated for the Fat Bike Birkie event. However, winter bike riding can be accessed from many of the trailheads utilizing the Chequamegon Area Mountain Bike Association trail system. Trail conditions can be found on the CAMBA Winter FAT BIKE page.

No special equipment classes will be recognized in the Fat Bike Birkie results or awards. Tandems bikes are allowed but will not be eligible for an individual award category.