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The Assenmacher 100 is a recreational and social fun bicycle ride through the farmland and villages of mid-Michigan. Started in 1980, it has become one of Michigan's premier century rides and has been endorsed by the Governor's Council on Physical Fitness, Health and Sports. It is held each year on the third Sunday in August. With routes of 20, 34, 56, 66, and 100 miles, there are courses for experienced cyclists as well as the casual rider. It has become a popular DALMAC warm up ride. Come on out for a great ride! 


Thank you for your interest in the Assenmacher 100.  The Start - Finish is at the Swartz Creek Middle School parking lot and you can link to a map here. The Five scenic, paved, bike-friendly routes are available for our 2018 ride. Rest stop refreshments, maps, turn by turn directions, and support vehicles will be on all routes until 3:00 PM. All routes will be marked with our new, improved, unique color coded "A" road arrows. The routes are designed to coincide so, depending on the distances, you will be able to ride with riders doing various distances.

  • 20 miles flat
  • 34 miles flat to rolling hills
  • 56 miles flat to rolling hills
  • 100+ kilometers (66 miles) flat to rolling hills
  • 100 miles (Century) flat to moderate hills.


Parking is available at the Swartz Creek Middle and High Schools. Swartz Creek, Mi 48473.


A limited quantity of custom designed ASSENMACHER 100 T-shirts will be available for only $16.00 at the registration area on the day of the ride. At this price, they won't last long!

We Are Having A Party! Come celebrate your successful completion of the 39th Assenmacher with us after the ride. Enjoy Flint Style coney dogs, snacks, good music and company at the school.

Assenmacher 100 Registration and Costs

The Assenmacher 100 Application form (PDF) can be downloaded and printed from the link located near the top and bottom of this web page. If you cannot print the application, feel free to stop into Assenmacher Bicycle Company 1272 W. Hill Rd. Flint MI 48507, call 810 232-2994 or email us your name and address and we'll send one to you.

Costs are only $15 for pre-registered riders and $25 after 7/1/2019 and day of ride. Register before July 1st and save.

Family Rate

A maximum family pre-registered rate of $45.00 is available for families with dependent children under 18 years of age. All riders must use the same application form and/or be received in the same envelope. After July 1st, family registration is $55.00.


Pre-registration is recommended. Please use one form per address if possible. Detach and mail completed form with your check, made payable to:

6465 Corunna Rd.

Registration is from 7:00 AM until 10:30 AM. Century riders must leave by 8:00 AM. All other riders should be on the road by 10:30 AM There will be no refunds after August 1st. 2019.

All riders must sign the release. A parent signature is required for applicants under 18. Riders under 16 must be accompanied by an adult.

Download the 2019 Assenmacher 100 Application

Download RideWithGPS files  for the Assenmacher 100