This is some solid information from the DNR. – Rick Mazur –
Electric Bikes in Michigan.
An electric bicycle (or e-bike) is a bicycle that has a small rechargeable electric motor that can give a boost to the pedaling rider and on some models can take over completely. To qualify as an electric bike in Michigan, it must meet the following requirements:
- It must have a seat or saddle for the rider to sit on.
- There must be fully operational pedals.
- It must have an electric motor of no more than 750 watts, or 1 horsepower.
Whether you can ride an electric bicycle on a trail depends on several factors – the e-bike's class, the type of trail, and whether the authority that manages or oversees the trail allows the use. You can read the full legislation here,