SINET™ Bottom Bracket Torque Sensor – 68 mm

Overview The SINET™ Bottom Bracket Torque Sensor provides smooth, proportional pedal assistance by measuring both rider pedaling force and crank rotation. Unlike a basic cadence sensor that only detects crank movement, the torque sensor adjusts motor assistance in response to how hard the rider is pedaling. This sensor is designed for bicycles and trikes with a 68 mm threaded bottom bracket shell and requires a compatible square-taper crankset. Measures rider pedaling force and crank rotation Provides smooth, proportional pedal assistance Fits a 68 mm threaded bottom bracket shell Requires compatible square-taper crankarms Designed for current E-BikeKit SINET™ systems Includes protective cable-routing grommet 59 cm torque-sensor extension cable sold separately Important Installation Notice: Installation requires removal of the existing bottom bracket and drilling a cable-routing hole in the bottom bracket shell. The included grommet must be installed in the drilled opening to protect the sensor cable from the frame. Important Compatibility Notice: This sensor is designed for current E-BikeKit SINET™ systems and is not a direct replacement for Legacy E-BikeKit pedal-assist components. How Torque-Sensing Pedal Assist Works The SINET™ torque sensor measures force applied through the crankset while also detecting crank rotation. The SINET™ controller uses this information to regulate motor output according to rider effort and the selected pedal-assist level. This creates a more natural riding experience than cadence-only pedal assist: Light pedaling produces lighter motor assistance Stronger pedaling produces greater motor assistance Assistance responds progressively instead of switching on at a fixed output Low-speed starts and transitions between assist levels feel smoother Exact assistance response depends on LCD assist level, controller programming, gearing, rider input, and operating conditions. Fitment Requirements Bottom Bracket Shell Width: 68 mm Bottom Bracket Type: Threaded Crank Interface: Square taper Crank Compatibility: Requires compatible square-taper crankarms Electrical Platform: Current E-BikeKit SINET™ system Frame Modification: Cable-routing hole must be drilled in the bottom bracket shell Cable Protection: Included grommet must be installed in the drilled opening Important: Confirm the frame has a 68 mm threaded bottom bracket shell and sufficient internal clearance before installation. This sensor is not intended for press-fit bottom brackets, external-bearing crank systems, one-piece cranks, oversized bottom bracket shells, or incompatible crank interfaces. SINET™ System Compatibility Compatible With: Current E-BikeKit SINET™ conversion systems Current E-BikeKit SINET™ complete trike systems 68 mm threaded bottom bracket shells Compatible square-taper cranksets and crankarms SINET™ integrated-controller systems SINET™ external-controller systems Not Compatible With: Legacy E-BikeKit pedal-assist systems Legacy E-BikeKit controllers or wiring harnesses Cadence-only pedal-assist connections Press-fit bottom bracket systems External-bearing crank systems One-piece crank systems without the appropriate crank conversion Third-party electrical systems unless compatibility has been confirmed Matching connector appearance alone does not confirm compatibility. Verify both the complete SINET™ electrical platform and mechanical fit before ordering. Specifications Brand: E-BikeKit Platform: SINET™ Product Type: Bottom bracket torque and cadence sensor Bottom Bracket Fit: 68 mm threaded shell Crank Interface: Square taper Pedal-Assist Function: Proportional torque-sensing assistance Cable Routing: Through drilled opening in bottom bracket shell Cable Grommet: Included Extension Cable: Sold separately Variants: None What’s Included One SINET™ 68 mm bottom bracket torque sensor One protective cable-routing grommet Not Included: Crankarms Crankset Bottom bracket tools Drill or drilling tools SINET™ Torque Sensor Extension Cable – 59 cm Installation Notes Disconnect and remove the battery before beginning installation Confirm the frame uses a 68 mm threaded bottom bracket shell Remove the existing crankarms and bottom bracket using the correct bicycle tools Confirm the replacement crankarms use a compatible square-taper interface Select a cable-routing location that avoids welds, frame joints, structural reinforcements, and internal interference Drill the required cable-routing hole using proper tools and installation practices Deburr the opening and install the included grommet before routing the sensor cable Do not route the cable through an unprotected metal opening Install and tighten the torque sensor according to required bottom bracket orientation and torque specifications Route the cable away from chainrings, crankarms, chains, steering components, tires, and sharp edges Align connector arrows and pins before joining the plugs Do not twist or force the connectors Verify crank clearance and proportional pedal-assist operation after installation Professional Installation Recommended: This installation requires bicycle drivetrain service and permanent frame modification. It should be completed by a qualified bicycle or electric-bike technician familiar with bottom bracket installation, cable routing, and frame modification. Extension Cable The standard sensor cable may not provide sufficient routing length for every frame configuration. Larger bicycle frames, upright trikes, and recumbent trikes commonly require additional cable length. The SINET™ Torque Sensor Extension Cable – 59 cm is available separately and provides additional reach for cleaner routing with less strain on the cable and connectors. Add the SINET™ Torque Sensor Extension Cable to your order. Support Not sure whether your bottom bracket and crankset are compatible? Contact us before ordering and we can help identify whether this torque sensor is appropriate for your bike or trike. Clear photos of the crankset and bottom bracket area are especially helpful for fitment questions. Questions? Call us toll-free at 1-866-882-3245, Monday–Friday, 9am–5pm ET, or email support@ebikekit.com.