Bytowski Maraton Rowerowy MTB Family is an amateur mountain-bike marathon in Poland that starts and finishes in Bytowo. The race runs on forest routes and offers a 40 km main distance, a 20 km shorter option, and a separate route for children. Adults can enter the main distances from age 18, while the children's race is for riders up to 12 years old. The event has been organized since 2013 by the "Gryf" Cycling Club under the patronage of the Mayor of Bytów.
The race is built for both solo riders and small teams, with team entries made up of two to four people. It is a mass event rather than a pro-only race, so the field can include local amateurs, families, and riders using the shorter distance as a more approachable challenge. Riders get a refreshment point on the route, every finisher receives a medal, and the top three in each category receive prizes. Part of each entry fee goes to charity, which gives the event a community purpose beyond the racing itself.