The Grin All-Axle Hub Motor
One motor family. Every adventure. Every smile.
The All-Axle is unlike any other hub motor. Designed to fit nearly every bike standard, it brings smooth, silent, and powerful direct-drive performance to your ride. Whether you’re pedaling solo, sharing the joy on a tandem, or taking your bike across the globe, the All-Axle is ready.
Why tandems love the All-Axle
Tandems are about teamwork, connection, and shared joy. With the All-Axle, you’ll spend less time worrying about hills or sore knees and more time smiling, laughing, and riding together. Maybe you don’t have the hours to train anymore, or maybe your knees are older than your spirit. Whatever the reason, electrification is about keeping you riding—side by side.
Built for your adventures
- Quiet and powerful: Whisper-quiet direct drive lets you enjoy the ride, not the motor.
- Travel ready: Pair with our travel-safe batteries and bring your tandem with you anywhere.
- Custom fit: Our specialists adapt each system seamlessly into your frame. For Calfee tandems, torque arm adapters disappear into the design. For other frames, our removable clamp makes it easy to switch between pedal and e-assist.
Your ride, your choice
Our travel-safe batteries are world-class, but we also offer more affordable battery options to match your needs. Normally these batteries are $250 each, but when you purchase them as part of a complete system we discount them to $220 per battery. Whatever your budget or your vision, we’ll guide you through the choices so your conversion feels effortless.
The first step: education
Every great ride starts with understanding your options. Our experts are here to walk you through what an e-bike conversion could mean for your tandem journey. Start by giving us a call at 1-800-965-2171 extension 4 and let’s talk about what’s possible.
Files and links for more info
FREE U.S. SHIPPING ON ORDERS $50+ FOR MOST ITEMS
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Looking for an estimate or further customization? Select “Estimate Only (Pay Later)” option at check-out and a Calfee Design Representative will be in touch.
Notice: Cancellation and refund for an online order will result in a fee of 15% of the order total. Restocking and handling charges may apply for items that have shipped. Refunds for Credit Card purchases will be credited back to the original Credit Card. No refunds will be issued for items after 60 days of purchase.