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Murf Electric Bikes

The Fat PAX Step-Thru E-Bike | Class 3 Cruiser

The Fat PAX Step-Thru E-Bike | Class 3 Cruiser

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SKU: EB-FMST-BN-UL

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Price: $1,895.00
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The Fat PAX Step-Thru E-Bike delivers the ultimate fusion of laid-back California cruiser luxury and high-voltage all-terrain dominance. Built around a low 19.0-inch step-over frame, it invites riders of all heights and flexibility levels to mount effortlessly in everyday attire. Beneath its timeless beach cruiser silhouette lies an aggressive 52V 780Wh Samsung battery pack and a 750W rear hub motor delivering 85 Nm of climbing torque, rolling smoothly on massive 26" × 4.0" pneumatic fat tires and halted by dual-piston Tektro hydraulic disc brakes.

Statutory Regulatory Notice: Compliant with 15 U.S.C. § 2085, 16 CFR Part 1512, and Texas Transportation Code § 551.102. Fully certified under ANSI/CAN/UL 2849 (complete electrical system) and UL 2271 (lithium battery pack). Factory firmware delivers user-selectable Class 2 (20 MPH throttle) and Class 3 (up to 28 MPH pedal assist) authority with zero vehicle licensing, registration, or state inspection required.

Who's This For
  • Effortless Step-Through Riders: Cyclists seeking a rugged, full-sized fat tire e-bike without the physical barrier of a high top tube, offering a gentle 19-inch step-over height.
  • Beach, Boardwalk & Coastal Explorers: Riders who want to cruise loose sand, damp shorelines, and wooden boardwalks with the plush cushion and traction of 4-inch wide pneumatic tires.
  • Upright Comfort Commuters: Suburban and urban commuters demanding an upright, neck-friendly riding posture with swept-back chrome handlebars and a wide padded cruiser saddle.
  • High-Voltage Hill Climbers: Anyone frustrated by sluggish 48V e-bikes who demands the snappy hill-climbing acceleration and voltage stability of an authentic 52V Samsung power architecture.
What This Bike Actually Solves
  • Eliminates High-Step Mounting Strain: The ultra-low 19-inch step-thru clearance allows you to swing your leg through smoothly, making mounting and dismounting effortless at red lights or in work attire.
  • Banishes Voltage Sag on Long Rides: Standard 48V systems lose punch as the charge drops; the 52V 15Ah Samsung battery maintains brisk acceleration and peak 85 Nm torque through the final mile.
  • Absorbs Rough Terrain Naturally: The massive 26" × 4.0" tires provide pneumatic suspension, floating over seams, potholes, and gravel without the maintenance or fluid leaks of mechanical suspension forks.
  • Guarantees Effortless Stopping Power: Dual-piston Tektro hydraulic disc brakes with oversized 180mm stainless steel rotors deliver smooth two-finger modulation and zero hand fatigue when stopping a 75 lb platform.
Real-World Riding Scenarios
  • Coastal Boardwalk & Beach Excursions: Float smoothly over boardwalk expansion joints, packed sand, and gravel beach paths with wide tires running low pressure and cadence assist dialed to effortless cruising.
  • Suburban Greenways & Hill Climbs: Conquer steep hill climbs and neighborhood headwinds without breaking a sweat, leveraging 85 Nm peak torque and Shimano 7-speed gearing.
  • Sunset Neighborhood Cruising: Enjoy effortless evening rides with full heads-up visibility, illuminated by the 550-lumen 3-LED frame-powered headlight and integrated safety tail light.
The Fat PAX Step-Thru vs. Generic Step-Thru Fat E-Bikes

Generic fat tire e-bikes frequently cut corners by utilizing budget 48V electrical architectures, low-grade mechanical cable brakes that stretch under load, and uncertified generic battery cells. The Fat PAX Step-Thru is built to an uncompromising premium standard: an authentic 52V electrical platform with genuine Samsung 35E cells, dual ANSI/CAN/UL 2849 and UL 2271 lab certifications, dual-piston Tektro hydraulic brakes with 180mm rotors, and a dedicated 2-year manufacturer warranty supported by Pathfinder Pedal's local San Antonio service team.


The Fat PAX Step-Thru E-Bike | Class 3 Cruiser

EFFORTLESS STEP-OVER ACCESSIBILITY, SWEPT-BACK BARS & PLUSH ANATOMICAL SADDLE

19-Inch Ultra-Low Step-Thru & Timeless California Cruiser Posture

Engineered to eliminate the high-step barrier common to rugged e-bikes, The Fat PAX features a low 19-inch step-thru frame geometry that invites riders of all heights and flexibility levels to mount effortlessly in everyday attire. High-rise swept-back chrome handlebars pair with an extra-wide padded cruiser saddle and stitched vegan leather locking grips, delivering a relaxed, heads-up riding posture that completely relieves strain on wrists, neck, and lower back whether you are touring coastal boardwalks or navigating city traffic.

The Fat PAX Step-Thru E-Bike | Class 3 Cruiser

HIGH-VOLTAGE HILL CLIMBING, 780WH CAPACITY & ZERO VOLTAGE SAG

52-Volt Samsung Power & 28 MPH Dual-Mode Authority

Leaving standard 48V systems behind, The Fat PAX is powered by a high-pressure 52V 15Ah (780Wh) lithium-ion battery pack built with genuine Samsung 35E cells. The higher voltage architecture draws fewer amps for equivalent wattage, running cooler and sustaining peak 85 Nm climbing torque even as the charge depletes. Configurable via the backlit LCD cockpit, riders can seamlessly cruise at 20 MPH on pure thumb throttle (Class 2) or unleash up to 28 MPH pedal assist (Class 3) to flatten rolling hills and pace urban vehicle lanes.

The Fat PAX Step-Thru E-Bike | Class 3 Cruiser

26" × 4.0" ALL-TERRAIN TIRES, 180MM ROTORS & NATURAL SHOCK ABSORPTION

Pneumatic Float & Tektro Hydraulic Stopping Leverage

Experience the signature 'all-terrain float' of 26" × 4.0" fat tires that absorb road seams, gravel vibration, and cobblestone chatter using pure pneumatic physics. Running lower tire pressures creates a wide contact patch that glides over packed coastal sand, boardwalk planks, and broken city asphalt without the maintenance of mechanical suspension forks. When it is time to slow down, dual-piston Tektro hydraulic disc brakes clamping 180mm stainless steel rotors provide smooth, fade-free two-finger stopping control in wet or dry conditions.

SPECIFICATIONS & COMPLIANCE

Know Before You Buy: Specs, Laws & Assembly

E-Bike Class Flexibility & CPSC Compliance

Statutory Authority & Compliance

Federal Statutory Definition: Complies fully with 15 U.S.C. § 2085 (Low-Speed Electric Bicycles) and 16 CFR Part 1512 (Bicycle Safety Standards). Fully classified as a consumer bicycle under federal jurisdiction.

State-Level Operational Authority: Complies with Texas Transportation Code § 551.102. Legally operated on public streets, designated bike paths, and multi-use greenways without vehicle registration, license plates, safety inspection, or driver's license.

Electrical & Battery Fire Safety: Independently tested and certified under ANSI/CAN/UL 2849 (Complete Electrical System for eBikes) and UL 2271 (Standard for Batteries in Light Electric Vehicles) featuring genuine Samsung 35E lithium-ion cells.

Real-World Range & Battery Safety

Real-World Range Expectations

  • Heavy Throttle & High-Speed Sprint (25–35 Miles): Continuous 20 MPH throttle cruising or riding at 25–28 MPH in Assist Levels 4–5 into rolling hills or brisk coastal headwinds.
  • Moderate Commuting & Mixed Cruising (35–48 Miles): Flowing through neighborhood commutes, urban greenways, and city streets in Assist Levels 2–3 with active pedaling and intermittent throttle usage.
  • Extended Eco Touring & Casual Flat Boardwalks (48–60+ Miles): Relaxed cruising in Assist Level 1 on flat beachfront paved paths and greenways with consistent cadence.

Technical Specifications & Key Specs

Master Technical Specifications

Motor: 750W Continuous Rear Hub Motor (85 Nm Peak Torque)
Battery: 52V 15Ah (780Wh) Lithium-Ion with Samsung 35E Cells
Top Speed: Class 2 (20 MPH) & Class 3 (up to 28 MPH) Selectable
Throttle: Right-Hand Precision Thumb Throttle
Pedal Assist: 5-Level Cadence Sensing Assist System
Estimated Range: 30–60 Miles per Charge
Brakes: Tektro Hydraulic Disc Brakes (Dual-Piston)
Rotors: 180mm Stainless Steel Front & Rear Rotors
Drivetrain: 7-Speed Shimano Tourney with RapidFire Shifter
Tires: 26" × 4.0" All-Terrain Pneumatic Fat Tires
Frame: 6061-T6 Heat-Treated Aluminum Low-Step Frame (19" Standover)
Fork: Rigid 6061 Custom Alloy Cruiser Fork
Handlebars: High-Rise Swept-Back Chrome Cruiser Bars
Saddle: Extra-Wide High-Density Padded Cruiser Saddle
Grips: Ergonomic Stitched Vegan Leather Locking Grips
Headlight: Integrated 550-Lumen 3-LED Frame-Powered Headlight
Taillight: Frame-Integrated High-Output LED Tail/Brake Light
Display: Center-Mounted High-Contrast Multi-Function LCD
Total Weight: ~75 lbs (Including Battery)
Payload Capacity: 300 lbs Maximum Structural Load Rating
Safety Certification: ANSI/CAN/UL 2849 (System) & UL 2271 (Battery)

What's Included in the Box

What's in the Box & Assembly Guidance

  • 1× Murf The Fat PAX Step-Thru frame with motor, rear wheel, and drivetrain pre-installed
  • 1× 52V 15Ah (780Wh) Samsung-cell frame-integrated lithium battery pack
  • 1× 52V 2.0A Smart Fast Charger (110V–240V AC input, auto-shutoff)
  • 2× Unique battery locking keys
  • 1× 26" × 4.0" quick-release front wheel assembly
  • 1× Swept-back cruiser handlebar & stem assembly
  • 1× Integrated 550-lumen 3-LED headlight
  • 1× Left & right non-slip cruiser pedals (9/16" thread)
  • 1× Ergonomic seat post and wide cruiser saddle
  • 1× Pathfinder Pedal multi-tool setup kit
  • 1× Official Murf Owner's Manual & Quick-Start Guide

Assembly Guidance: The Fat PAX arrives safely packaged with core wiring, motor, and rear drivetrain pre-installed. Setup requires attaching the front wheel, handlebar stem, pedals, and headlight using the included multi-tool. Typical setup time is approximately 25 to 35 minutes.

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