| Maciag Offroad |  | | Leipzig | 11 |
| MacQueen's Bike Shop | | PE | Charlottetown | 24 |
| Maros Bike | | | Cluj-Napoca | 1 |
| Mellow Velo | | NM | Santa Fe | 7 |
| Messier Bicyclettes | | QC | Saint-Jean-sur-Richelieu | 11 |
| Metal Motion Bikes | | | Witten | 3 |
| Middle of Town Cycling | | KY | Louisville | 1 |
| MK Bikes | | | Karlsruhe | 2 |
| Motion Makers - Asheville | | NC | Asheville | 15 |
| Motion Makers - Sylva | | NC | Sylva | 0 |
| Mountain Mania Cycles - Carterton | | | Carterton | 2 |
| Mountain Mania Cycles - Didcot | | | Didcot | 2 |
| Mountain Mania Cycles - Goring | | | Reading | 2 |
| Mountain Mania Cycles - Tring | | | Tring | 5 |
| Mtb.lv Bicycle Workshop | | | Riga | 5 |
| Mud, Sweat, and Gears | | AB | Spruce Grove | 13 |