Spiny 2 Clip-On Kit Turns Any Bicycle Electric in Three Seconds

Most e-bike conversion kits ask you to roll up your sleeves, pull out the tools and spend an afternoon wrestling with brackets and wiring. Spiny 2 goes a very different route: once the mounting hardware and sensors are bolted on for good, the motor-and-battery unit simply clicks into position before a ride — and pops off again in roughly three seconds afterward.

The second-generation system packs its drive and power source into a single 2.2 kg (4.9 lb) module. It works through friction: a roller presses against the rear tire when cadence and speed sensors notice you’ve started pedaling, delivering assistance within about 0.25 seconds. Stop pedaling and the roller lifts clear, so the bike freewheels like a normal bicycle without motor drag.

• Power and speed limits: The US version is rated at 250W nominal with peaks up to 750W, assisting to 20 mph (32 km/h). Canadian units peak at 500W, while most other markets are capped at 250W and 25 km/h (15.5 mph) to stay street legal.
• Battery and range: A 266Wh pack lives inside the removable unit, with a claimed range of up to 90 km (56 miles) under ideal conditions — a figure that will shrink considerably depending on assist level, terrain, rider weight and speed.
• Charging and controls: Recharging runs through USB-C Power Delivery, meaning a laptop charger or powerbank can top it up. Five pedal-assist levels are managed via a smartphone app or an optional Bluetooth handlebar remote, and the unit carries an IP65 weather-resistance rating.
• Bike compatibility: Road, city, hybrid and touring bikes with rim or disc brakes are largely supported, plus adapters for tight-clearance frames and Bromptons. Rear-suspension bikes are excluded, and a standard rear fender can’t be used (floating-style fenders should still fit).

Why It Matters

Friction-drive kits aren’t the most refined way to electrify a bicycle, but they trade polish for convenience — and that trade-off is the whole point here. A rider who loves the feel of a lightweight pedal bike can keep it exactly that for most of the week, then snap on assistance for a longer commute or a hilly errand, and strip it off again in seconds. That modularity is a different proposition from a permanent conversion or a second dedicated e-bike in the garage.

The catch is availability. Spiny 2 launched through Kickstarter, with deliveries currently estimated for April 2027 — and crowdfunded hardware timelines are never guarantees. Spiny has shipped a previous version of the kit in the hundreds, which offers some reassurance, but backers are still placing a bet on a future delivery date. If the promises hold, though, the idea of turning a standard bicycle electric for Monday’s commute and back again before the weekend is a genuinely appealing one.

This story is a particularly good match for our micromobility coverage, where compact, adaptable electric transport is the central theme.