ASYNC L5 Prototype: A Futuristic Fat-Tire E-Bike That Turns Heads (and Has Big Plans)
March 26, 2024
The ASYNC L5 is one of those e-bikes that immediately changes the vibe of a ride—people look over, double-take the frame, and you can tell it’s not the usual “same parts, different logo” fat-tire bike.
This is a prototype, so I’m treating it like a real-world sneak peek: how it feels under me, how the controls and braking behave, and whether the overall ride makes me excited for the final production version.
The look: sleek, angular, and unmistakably ASYNC
The first thing that hit me was the frame design. It has that futuristic, sculpted ASYNC styling that stands out in a parking lot full of typical step-overs and utility frames.
It also looks cohesive: integrated lighting up front, a big integrated rear fender, and tail lights built into the frame itself. It comes off more “designed” than “assembled,” which is rare in this category.
Quick walkaround: the stuff I noticed right away
This prototype rolls on 26x4 Kenda Crusade tires with a dual-sport style tread. In person, they look ready for mixed riding—street, grass, rough lots, light trail, and winter slop.
Up front, there’s a coil spring suspension fork with a lockout. The cockpit is MTB-styled with a riser bar, rubberized locking grips, and a left-mounted thumb throttle.
The display is a center-mounted 5.5-inch color IPS unit, and it’s easy to read while moving.
Braking is handled by Logan 2-piston hydraulic disc brakes. Given the bike’s size and intent, that was exactly what I wanted to see.
My first ride: natural assist… with a little extra punch
I started out in pedal assist level 3 and focused on feel.
The pedal assist came on a little strong at first, but it still felt connected to my pedaling in a natural way. This prototype uses a torque sensor, and it did what I want a torque-sensor bike to do: respond with me, not after me.
If anything, it felt like it could use a bit of calibration refinement, but it was absolutely rideable and predictable once I got a few pedal strokes in.
Handling and comfort on rough pavement
The lot I rode in is uneven and cracked, with debris and broken surfaces—perfect for judging whether a bike feels nervous or composed.
Between the fat tires and the fork, the L5 stayed stable and easy. The coil fork is… fine. It takes the edge off roughness, but I wouldn’t expect it to magically turn potholes into pillows.
Also worth calling out: I heard some rattling, and it seemed like it was coming from the fenders (and potentially the fork setup). It felt more like “prototype setup and install tweaks” than a fundamental design issue, but it’s the kind of thing that stands out when you’re listening for build quality.
Power feel: plenty for cruising, capped on this prototype
I bumped up to pedal assist level 5 and added throttle. Getting up to speed was easy, and it had plenty of push for a fat-tire all-terrain bike.
This prototype is speed-limited to 20 mph, and I watched it top out right there on the display.
The bigger story is what’s planned for production: this prototype is running a 48V 15Ah battery inside the frame, while the production version is expected to move to a 52V 20Ah removable battery. I can’t validate the range claims without that final battery setup, but the planned jump in voltage and capacity is exactly the kind of change that can meaningfully affect how the bike feels on longer rides.
Grass, curb drops, and “all-terrain” reality
I took it onto grass and up a small hill. It didn’t feel sketchy, and the 26x4 tires definitely did their job keeping the bike planted.
Rolling off a curb was also drama-free. The bike’s overall demeanor is stable and confidence-inspiring—the kind of ride that makes sense for mixed surfaces and messy seasons.
If you live somewhere like I do (Michigan), this style of fat-tire setup can be genuinely practical when roads get rough and weather gets weird.
Brakes: strong, controlled stopping
I did a simple brake test from speed, and the Logan hydraulic setup had plenty of stopping power.
On a bike in this weight class (this prototype is listed at 77 lb), solid brakes aren’t optional. The L5 delivered the kind of deceleration that makes me comfortable mixing it with neighborhood traffic and unpredictable surfaces.
The tech I’m waiting for: IoT features (production model)
Because this is a prototype, the IoT features aren’t enabled here. That’s a big deal, because the production model is expected to include:
Digital key
Geolocation
Auto unlock
Find my bike
Those features could end up being one of the L5’s main differentiators—especially for city living, apartment storage, and everyday peace of mind. Right now, I can only judge the physical bike and the ride feel.
What We Like
The frame design is genuinely unique and futuristic
Stable, confidence-building ride feel on rough pavement and grass
26x4 tires feel well-suited for mixed terrain and seasons
Strong braking from the Logan 2-piston hydraulic discs
Integrated lights and dual rear tail lights with brake functionality are great for visibility
Things To Consider
This was a prototype ride, so the final feel may change with the production battery and tuning
Fender rattle (at least on my setup) was noticeable and worth addressing
The coil fork is adequate, but I’d love to see improved suspension on the final version
The prototype saddle felt firm; comfort-focused riders may want a different seat
The most exciting IoT features aren’t testable on the prototype
Final Thoughts
The ASYNC L5 prototype left me excited mostly because it doesn’t feel generic. The styling is bold, the bike rides with a stable “all-terrain” attitude, and the braking and basic control layout make sense for real-world use.
At the same time, the big questions are tied to the production version: the 52V 20Ah removable battery and the promised IoT features could meaningfully change the ownership experience. If ASYNC nails those elements (and cleans up the little prototype rattles and tuning quirks), the L5 could end up being a seriously compelling companion to the A1 Series.
Links
ASYNC L5 (use promo code RunPlayBack for a $50 discount): https://asyncbike.com/products/async-l5
Bell Super 3R MIPS Bike Helmet: https://amzn.to/3TJ1vTR
Fox Racing Bike Gloves: https://amzn.to/40P5SyQ
Hafny Handlebar Bike Mirror: https://amzn.to/3FVubmN
Veeape Electric Air Pump: https://amzn.to/3LPLTf9
Denlix Military Sling Bag: https://amzn.to/3LTKN2c
Lamicall Bike Phone Mount: https://amzn.to/3LXmD6O
Onvian Wireless Bike Alarm: https://amzn.to/42KUgyE
RunPlayBack Merch: http://shop.runplayback.com/