Coastside Mountain Bikers (CMTB) was started on the San Mateo county coast side in 2016 and focused solely on issues surrounding mountain biking access and advocacy on the Coastside. In 2020, Coastside on Bikes was started, and the two organizations began working closely together on various projects in the community. In January 2023, the two groups merged under the name "Coastside on Bikes" and updated their mission to function as a regional bike advocacy organization in addition to continuing existing work in the community. Their mission is to accelerate the adoption, acceptance, and expansion of mountain bike opportunities on the San Mateo Coast while balancing environmental sustainability, and the physical and mental needs of the community. CMTB represents the branch of the organization that encourages community members of all ages to access the outdoors through the sport of mountain biking. It’s a member of the California Mountain Biking Coalition (CAMTB), an organization dedicated to creating a statewide voice for mountain bikers.