The OPEN BELT DRIVE (OBD) is the latest drive system to be introduced to TRAMPA’s amazing range. Replacing the URBAN BELT DRIVE System, the Open Belt Drives uses all-in-one Motor Mounting Panel & Truck connectors, CNC’d from premium heat-treated T6 aluminium.
Also CNC’d from Premium Aluminium is the OBD Motor Adaptor, fitting harmoniously into the Mounting Panel, the motor adaptor can be moved easily by tightening/loosening an M4x20mm Socket-capped bolt, allowing precision belt tensioning on the fly.
The OPEN BELT DRIVE is available in two models, each designed with different gear ratios & very different performances in mind.
OBD 66T uses the 66 tooth Slave Pulley with a gear ratio of 4.71:1 - giving a top speed of ~36mph, and performance favouring eye-watering top speeds over acceleration. OBD 66T systems can use 8 or 9 inch Wheels.
OBD 76T uses the 76 tooth Slave Pulley with a gear ratio of 5.43:1 - giving an amazing level of torque (similar to the Spur Gear Drive), and performance favouring insane acceleration over overall top speed. Due to clearance, OBD 76T Systems can only use 9 inch Wheels.
Designed to be AS SIMPLE AS POSSIBLE - these drive systems truly are a DIY-er’s dream.