Sentinel S90 smart bike lock from the official Sentinel hardware page

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🔒 Smart Lock

Fleet Recommended

Sentinel

S90

Name: S90
Brand: Sentinel
SKU: S90

Heavy-duty smart bike lock for wide-tire bikes with GPS, Bluetooth, RFID, cellular connectivity, solar charging, and UART/CANBUS integration.

Wide Tire Support

Up to 80 mm / 3.15 in

Battery

5000mAh

Charging

Magnetic / USB-C / solar

Integration

UART / CANBUS

Contact for Pricing Manufacturer Site

Technical Specifications

Physical Specifications

IP Rating

IP66

Connectivity

Bluetooth

Yes

Companion App

Sentinel fleet platform / rider app workflows

GPS

Yes

Cellular

GSM, CAT-M, CAT-NB, CAT-1

WiFi

Yes

Fit & Power

Wide Tire Support

Up to 80 mm / 3.15 in

Size / Weight

165.2 x 197.9 x 44.9 mm; 1.1 kg

Battery

Rechargeable lithium battery, 3.7V / 5000mAh

Charging

Magnetic charging, USB-C, and solar panel support

Unlock & Network

Unlock Methods

RFID card, network remote unlock, and app unlock

Network

GSM, CAT-M, CAT-NB, CAT-1

Positioning

GPS, GLONASS, IRNSS, BD, Galileo, QZSS, AGNSS, Wi-Fi, and iBeacon

Waterproof Rating

IP66

Fleet Integration

Vehicle Interfaces

UART and CANBUS

Motor Integrations

Bosch and Bafang support noted on official page

Platform Support

Sentinel fleet software platform or third-party platforms via API

Features & Capabilities

Key Features

Supports wide tires up to 80 mm / 3.15 in

GPS, Bluetooth, RFID, and cellular connectivity

Solar, magnetic, and USB-C charging

UART and CANBUS support

Bosch and Bafang integration notes

Plug-in safety chain support

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

Cons

-80 mm support still falls short of a true 4 inch fat tire
-Heavier than compact locks at 1.1 kg

Ideal For

Wide-tire e-bikes

Bike-share fleets

OEM connected-bike programs

Compatible Fleet Platforms

Sentinel fleet software platform

Sentinel Smart Lock API

Specs taken from Sentinel S90 hardware page plus Sentinel Smart Lock API page on 2026-04-23. 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. Sentinel offers a Premium subscription model with the first year included free; recurring connectivity and platform fees are negotiated as part of the fleet RFQ.

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.

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 a Smart Lock API and states that all of its locks can run on the Sentinel fleet platform or third-party platforms via API.