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Sentinel
S90
Heavy-duty smart bike lock for wide-tire bikes with GPS, Bluetooth, RFID, cellular connectivity, 6P UART wiring, and solar/external power support.
Capability Categories
Locking / Access Summary
Wide Tire Support
Up to 80 mm / 3.15 in
Battery
5000mAh
Charging
Magnetic / solar / external
Integration
6P UART / CANBUS
Technical Specifications
Fit & Power
Unlock & Network
Positioning & Radio
Fleet Integration & Connector
Validation & Testing
Physical Specifications
Connectivity
Features & Capabilities
Key Features
Pros
- Best publicly documented wide-tire fit in this catalog expansion
- Strong integration story with API plus UART/CANBUS hooks
- Multiple power and access methods reduce operational friction
- Manual gives unusually complete network, GNSS, RFID, connector, and testing detail for a fleet lock
Cons
- -80 mm support still falls short of a true 4 inch fat tire
- -Heavier than compact locks at 1.1 kg
- -Manual and intro deck disagree on housing material and published weight
Ideal For
Compatible Fleet Platforms
Specs taken from Sentinel S90 hardware page plus Sentinel Smart Lock API page on 2026-04-23, then updated from S90 product manual v1.0 and Sentinel intro deck provided in May 2026. The manual is treated as primary where it conflicts with the intro deck: manual lists 1.1 kg and ABS housing; intro deck lists 1.2 kg and glass-fiber reinforced composite with fire-retardant characteristics. Sentinel is a Belgian company headquartered at Corda Campus in Hasselt, founded in 2017; sentinel-tec.com is the B2B / OEM brand and Zingi (zingi.solutions) is the bike-share spinoff. The S90 is the only model in the Sentinel range with explicit CANBUS and UART e-bike motor integration (tested with Bosch and Bafang), allowing the lock state to immobilize the motor itself; its 80 mm shackle is purpose-built for cargo and fat-tire e-bikes. Largest reference deployment to date is 8,500 S90 units supplied to PBSC / Lyft Urban Solutions for the BiciMAD Madrid bike-share relaunch (2022-2023). Other named white-label and fleet customers include Blue-Bike, BASF Antwerp, Mobit, YUST, and Shell.
About This Product
Sentinel describes the S90 as a heavy-duty smart bike lock designed specifically for wide-tire bicycles. The official hardware page publishes support for tires up to 80 mm (3.15 inches), plus GPS, Bluetooth, RFID card access, Internet connectivity, solar charging, and plug-in safety-chain support.
The S90 product manual adds the operational details that were missing from the public page: physical dimensions, a 6P connector pinout, UART interfaces, cellular bands, GNSS performance, RFID protocol support, Wi-Fi positioning, Bluetooth OTA support, and validation tests for lock cycling, vibration, impact, water ingress, and salt spray.
For integration, Sentinel goes further than most public lock pages by documenting UART and CANBUS support plus compatibility with Bosch and Bafang systems. Sentinel also publishes API and S.Cloud materials showing that Sentinel hardware can run on the Sentinel fleet platform or third-party platforms via API.
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