| Abbreviation | Definition |
|---|---|
| BRAT | Bicycle Ride Across Tennessee |
| BRC | Bicycle Rain Canopy |
| BRCE | Bicycle Rain Canopy Equipment |
| BRDAA | Bicycle Ride Directors' Association of America (Fullerton, CA) |
| BRMBA | Black Rock Mountain Bike Association (Oregon) |
| BRR | Bike Ride to Rippey |
| BSCA | British Schools Cycling Association |
| BSO | Bicycle Shaped Object |
| BSO | Bike-Shaped Object |
| BSP | Bicycle Sports Pacific |
| BT | Biker's Tech |
| BTAF | Bicycle Times Adventure Fest |
| BTAG | Bicycle and Trail Advisory Group |
| BTAG | Bicycle and Trails Advisory Group |
| BTC | Bicycle Tour of Colorado |
| BTI | Bicycle Technologies International |
| BUG | Bicycle User Group |
| BUG | Bicycle Users Group |
| BUI | Bicycling Under the Influence |
| BUMP | Birmingham Urban Mountain Pedalers |