| Maciag Offroad |  | | Leipzig | 11 |
| MacQueen's Bike Shop | | PE | Charlottetown | 24 |
| Mad Elk Cycles | | | | 24 |
| Malatestas Bikes | | | | 1 |
| Maros Bike | | | Cluj-Napoca | 1 |
| Martin's Bicycle Shop | | ON | Southampton | 16 |
| Marty's Mountian Cycle | | BC | Victoria | 93 |
| Maul's Bike Shop | | MA | Halifax | 7 |
| MEC (Mountain Equipment Co-op) Barrie | | ON | Barrie | 4 |
| MEC (Mountain Equipment Co-op) Vancouver | | BC | Vancouver | 18 |
| Mellow Velo | | NM | Santa Fe | 7 |
| Messier Bicyclettes | | QC | Saint-Jean-sur-Richelieu | 11 |
| Metal Motion Bikes | | | Witten | 3 |
| Middletown Cycling | | KY | Louisville | 3 |
| Mike's Bikes | | NV | Tonopah | 1 |
| Mikes Hike And Bike | | KY | Richmond | 6 |
| Moment Bicycles | | CA | San Diego | 2 |
| Moment Bicycles - Carmel Valley | | CA | San Diego | 1 |
| 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 Connection | | NB | Lakeville | 2 |
| Mtb.lv Bicycle Workshop | | | Riga | 5 |