$7,349.00
TQ-HPR50 Drive Unit
SRAM GX Eagle Transmission Drivetrain
RockShox SID Select+ 3P Fork
RockShox SIDLuxe Select+ 3P Shock
| Size | S | M | L | XL |
|---|---|---|---|---|
| Rider Height | <172 | 172-182 | 180-188 | >188 |
| Reach | 437 | 457 | 476 | 496 |
| Stack | 594 | 605 | 615 | 627 |
| Bar Rise | 20 | 20 | 20 | 20 |
| Bar Sweep | 7.5° | 7.5° | 7.5° | 7.5° |
| Bar Width | 760 | 760 | 760 | 760 |
| BB Drop | 40 | 40 | 40 | 40 |
| Crank Length | 165 | 170 | 170 | 170 |
| Fork Length | 531 | 531 | 531 | 531 |
| Fork Rake | 44 | 44 | 44 | 44 |
| Front Center | 725 | 751 | 775 | 800 |
| Head Tube | 90 | 102 | 113 | 125 |
| Head Tube Angle | 66.5° | 66.5° | 66.5° | 66.5° |
| Rear Center | 435 | 435 | 435 | 435 |
| Seat Angle | 77° | 77° | 77° | 77° |
| Seat Tube | 420 | 430 | 470 | 490 |
| Seatpost Drop | 125 | 160 | 160 | 185 |
| Seatpost Length | 365 | 435 | 435 | 485 |
| Seatpost Offset | 0 | 0 | 0 | 0 |
| Standover Height | 730 | 730 | 730 | 730 |
| Stem Angle | ±6° | ±6° | ±6° | ±6° |
| Stem Length | 40 | 50 | 50 | 60 |
| Top Tube | 574 | 597 | 620 | 644 |
| Trail | 115 | 115 | 115 | 115 |
| Wheelbase | 1157 | 1178 | 1202 | 1227 |
In the world of mountain biking, where trails demand agility, power, and endurance, the Four stroke AMP LT ONE USA stands out as a game-changer. This electric mountain bike (e-MTB) from BMC combines cutting-edge technology with a sleek design, making it ideal for riders who crave the thrill of cross-country adventures without the extra weight. Whether you’re tackling steep climbs or flowing descents, the Fourstroke AMP LT ONE USA delivers a seamless blend of assistance and natural ride feel. In this in-depth review, we’ll dive into its features, performance, and why it might be the perfect addition to your garage.
Mountain biking has evolved dramatically over the years, with e-MTBs bridging the gap between traditional bikes and motorized assistance. The Four stroke AMP LT ONE USA is BMC’s entry into the lightweight downcountry category, designed specifically for the US market with specs that cater to American trails and rider preferences. Weighing in at around 15.9 kg (about 35 lbs), it’s one of the lightest full-suspension e-MTBs available, allowing for nimble handling that feels more like a non-assisted bike.
What sets the Four stroke AMP LT ONE USA apart is its focus on subtlety. The motor is discreetly integrated, and the overall aesthetics scream high-end performance without screaming “e-bike.” If you’re a rider who enjoys long days on varied terrain, from smooth singletracks to rocky descents, this model promises to amplify your experience without overpowering it.
At the heart of the Fourstroke AMP LT ONE USA is its premium carbon fiber frame, engineered with BMC’s APS (Advanced Pivot System) dual-link suspension. This setup provides 120mm of travel both front and rear, striking a balance between efficiency and comfort. The frame’s clean lines hide the TQ HPR50 drive system, a compact motor that’s both quiet and efficient. BMC has prioritized weight savings here, using high-modulus carbon to keep things light while maintaining rigidity.
The Fourstroke AMP LT ONE USA features internal cable routing for a tidy look, and it’s equipped with two bottle cage mounts inside the front triangle—a rarity for full-suspension e-MTBs. This practical touch is perfect for longer rides where hydration is key. The bike comes in sizes S to XL, ensuring a fit for most riders, and its color options often include sleek blacks and vibrant accents that appeal to style-conscious cyclists.
Build quality is top-notch, as expected from Swiss engineering. The welds are seamless, and components are spec’d to last. For the US market, the Fourstroke AMP LT ONE USA includes Maxxis Rekon 2.4″ tires with EXO protection, providing excellent grip on loose surfaces without sacrificing rolling speed.
When it comes to actual trail performance, the Fourstroke AMP LT ONE USA shines in downcountry scenarios—think fast, flowy trails with occasional technical sections. The 120mm suspension soaks up bumps effectively, thanks to the RockShox SID Select+ fork and Super Deluxe Select+ shock on this model. Riders report a playful, poppy feel that’s addictive for jumping small features or carving turns.
Uphill, the TQ HPR50 motor provides 50Nm of torque, assisting without overwhelming your pedaling input. It’s whisper-quiet, which enhances the natural biking experience. On descents, the 66.5-degree head tube angle offers stability, while the 77-degree seat tube angle keeps you centered for efficient climbing. Chainstays measure 435mm across sizes, contributing to the bike’s agile nature.
In reviews, testers praise the Fourstroke AMP LT ONE USA for its composure on rough terrain. It’s not built for extreme enduro, but for cross-country enthusiasts looking to extend their range, it’s spot-on. The bike’s low weight makes it easy to maneuver, and the electronic shifting from SRAM GX Eagle ensures crisp gear changes even under load.
The star of the show in the Fourstroke AMP LT ONE USA is the TQ HPR50 motor, a harmonic pin-ring drive that’s compact and lightweight. At just 1.85 kg for the motor alone, it integrates seamlessly into the frame, powering the bike with up to 250W of assistance. There are three modes: Eco for efficiency, Trail for balanced power, and Boost for steep climbs. The system is tunable via an app, allowing riders to customize assistance levels.
Battery-wise, the Fourstroke AMP LT ONE USA packs a 360Wh internal battery, good for 50-70 miles depending on terrain and rider weight. For epic adventures, a 160Wh range extender is available, clipping onto one of the bottle mounts. Charging is straightforward via a port on the frame, taking about 3-4 hours for a full charge.
One key advantage is the motor’s silence—it’s nearly inaudible, making the Fourstroke AMP LT ONE USA feel like a regular MTB on flats and downhills. This subtlety is a big draw for purists dipping into e-bikes.
Geometry plays a crucial role in how a bike rides, and the Fourstroke AMP LT ONE USA nails it for downcountry use. With a reach of 476mm in size large, it offers a modern, stretched-out fit that promotes confidence on descents. The bottom bracket drop is optimized for stability, and the short chainstays enhance playfulness.
Handling is responsive yet planted. Riders note that the Fourstroke AMP LT ONE USA excels in twisty singletracks, where quick direction changes are needed. The Big Wheel Concept (BWC) from BMC leverages 29-inch wheels for better rollover and traction, paired with a low standover height for easy mounting.
Compared to slacker enduro bikes, the Fourstroke AMP LT ONE USA prioritizes efficiency, making it a versatile choice for mixed-terrain rides common in the USA.
Let’s break down the spec sheet for the Fourstroke AMP LT ONE USA:
These components are trail-ready, with wireless shifting adding a premium touch. The Fourstroke AMP LT ONE USA is built to handle abuse while keeping maintenance low.
Like any bike, the Fourstroke AMP LT ONE USA has its strengths and weaknesses.
Pros:
Cons:
Overall, the pros outweigh the cons for riders seeking a refined e-MTB experience.
In the lightweight e-MTB space, the Fourstroke AMP LT ONE USA competes with models like the Scott Lumen and Trek Fuel EXe, both using similar TQ motors. The Scott offers a slightly slacker geometry (65.5° head angle) for more downhill confidence, but the Fourstroke AMP LT ONE USA edges out in weight and poppiness.
Against the non-electric BMC Fourstroke LT, the AMP version adds assistance without much penalty, making it a smart upgrade for aging riders or those in hilly areas. For US buyers, the Fourstroke AMP LT ONE USA’s spec tweaks, like tire choices, make it more attuned to American soil.
This bike is perfect for intermediate to advanced riders who want e-assistance without the bulk. If you live in areas with long climbs, like the Rockies or Appalachians, the Fourstroke AMP LT ONE USA will let you cover more ground. It’s also great for commuters turning to trails on weekends or anyone recovering from injury seeking a boost.
Not for beginners due to its price, or for those needing heavy-duty suspension—opt for full-power e-MTBs instead.
The Fourstroke AMP LT ONE USA redefines what a lightweight e-MTB can be. With its blend of Swiss precision, innovative motor tech, and trail-focused design, it’s a bike that encourages exploration. Whether you’re chasing personal bests or just enjoying the outdoors, the Fourstroke AMP LT ONE USA delivers joy on every ride. If you’re in the market for an e-MTB that feels alive and uncompromised, this model deserves a spot on your shortlist.
| Size — What's my size? | S, M, L, XL |
|---|
Only logged in customers who have purchased this product may leave a review.
Reviews
There are no reviews yet.