BU03
2 yearsComplete bike5 yearsFrame
Limited warranty · Terms applyMeet BU03
Built for everyday mobility without compromising capability, the G-SPEED BU03 combines an easy-access step-through frame with the strong, natural support of the Bafang GT800 mid-drive system. A 720 Wh removable battery, comfort-focused suspension components and a MIK rear rack make it equally suited to daily commuting, longer urban rides and practical everyday transport. With up to 150 Nm of torque and a maximum payload of 150 kg, BU03 is designed to feel stable, capable and easy to live with — every day.
Daily Commute
Bring more riding into the everyday. Set up your BU03 for the route between home and work.
Carry the Essentials
Take the things you need for the day. Ask about compatible accessories and secure your load.
After-Work Escape
Take the longer way home when the day allows. A quiet route can turn a routine journey into time outside.
G-SPEED BU03
Specifications
The components and equipment for BU03.
General Info
- Bike dimensions
- 76.0X26.4X43.3 Inches (193X67X110 CM)
- Net weight
- 69 lbs
- Rider height
- Small: 5'3"–5'7"
Medium: 5'7"–5'11"
Large: 5'11"–6'7" - Maximum rider weight
- 275 lbs
- Maximum rear rack load
- 60 lbs
- Bike class
- Class 2 (Convertible to Class 3)
- Water resistance
- IPX6
- Range
- Up To 60 Miles
- Bike safety certification
- UL 2849
- Battery safety certification
- UL2271
- Ideal use
- Urban, Comfort, Hybrid, Touring
- Pedal assist
- 5 Levels
Frameset
- Frame
- 6061 Aluminum, Putty finish
- Fork
- 100MM Travel, Coil Spring, Mechanical Lockout, 15X110 Boost Thru-Axle, Tapered Steerer Tube
- Rear spacing
- 148mm
- Fork spacing
- 110mm
- Frame style
- Step-Through
Wheelset
- Front wheel
- 29" Double Wall Aluminum, 36H, 13G Spoke, 15MM Thru-Axle, Schrader Valve
- Rear wheel
- 29" Double Wall Aluminum, 36H, 13G Spoke, 12MM Thru-Axle, Schrader Valve
- Tires
- CST 29*2.25"
E-Bike System
- Motor
- Bafang GT800, Mid-drive Motor, 150Nm, 750W
- Motor torque
- 150Nm
- Motor power
- Rated 750W
- Display
- BAFANG C400 TFT, Integrated In Bicycle Stem
- Battery
- BAFANG Removable Lithium-Ion 48V 15 Ah, 720 Wh, LG 21700M50LT cells
- Battery weight
- 8.8 lbs
- Throttle
- Included
- Charger
- BAFANG 54.6V 3A charger
- Charging time (0–100%)
- 6 Hours
- Lights
- Head Light: LED, 60LUX
Rear Light: LED, Integrated In Mudguard - Smart features
- Blue Tooth Connection, "G-Speed Bike" App
Brakes
- Front brake
- 2-piston Hydraulic disc brake
- Rear brake
- 2-piston Hydraulic disc brake
- Front brake rotor
- 180mm 6 bolt
- Rear brake rotor
- 180mm 6 bolt
Drivetrain
- Rear derailleur
- SHIMANO Cues, 9-Speed, RD-U3020
- Chainring
- BAFANG 38T
- Crankset
- BAFANG 170MM
- Pedals
- 9/16 Sealed Bearing Axle, Alloy Platform
- Shifter
- SHIMANO Cues, 9-Speed, SL-U4000-9R
- Chain
- KMC XGLidE 9-11 speed, 122L
- Cassette
- SHIMANO Cues, 9-Speed, CS-LG300-9 11-36T
Cockpit
- Saddle
- G-SPEED Vacuum Saddle
- Seatpost
- Suspension Post, 31.6MM, 40MM Travel, 350MM Length
- Seatpost clamp
- Integrated Hidden Clamp
- Stem
- 105MM Length, 31.8MM Clamp, Adjustable 90° - 150°
- Handlebar
- 31.8MM Bar Bore, 700MM Width, 38MM Rise, Backsweep 25°
- Headset
- ICR Ready
- Grips
- Rubber, 130mm, End closed, Single Lock Ring, Black
Included Accessories
- Rear rack
- MIK Patented System
- Mudguard
- Aluminum
- Chainguard
- ABS
- Kickstand
- Side Mounted
- Reflectors
- Included
- User manual
- Included
- Tools
- Hex Keys: M3, M4, M5, M6 – 1 Pcs Each
Open-end Wrench (8-10mm): 1 Pcs
Open-end Wrench (13-15mm): 1 Pcs
Open-end Wrench (14-17mm): 1 Pcs
Dual-head Screwdriver (Phillips / Flathead): 1 Pcs
Find your fit
Enter your height to see the recommended BU03 frame size.
Recommended size
Contact us for sizing advice
S · 420 mm160–170 cm
M · 460 mm170–180 cm
L · 510 mm180–200 cm
Geometry & Fit
Measurements are in millimeters unless noted.
S · 420 mm160–170 cm
M · 460 mm170–180 cm
L · 510 mm180–200 cm
| Measurement | S / 420 | M / 460 | L / 510 |
|---|---|---|---|
| Seat tube (A) | 420 | 460 | 510 |
| Effective top tube (B) | 587 | 590 | 600 |
| BB drop (C) | 75 | 75 | 75 |
| Head tube (D) | 135 | 135 | 135 |
| Head angle (E) | 68.5° | 68.5° | 68.5° |
| Seat tube angle (F) | 73.5° | 73.5° | 73° |
| Chainstay (G) | 497 | 497 | 497 |
| Front center (H) | 689 | 692 | 684 |
| Wheelbase (I) | 1176 | 1179 | 1171 |
| Reach (J) | 393 | 395 | 398 |
| Saddle height (K) | 545–725 | 585–765 | 635–815 |
| Fork length (L) | 512 | 512 | 512 |
| Fork offset (M) | 48 | 48 | 48 |
| Trail (N) | 122 | 122 | 122 |
| Stack (O) | 654 | 654 | 659 |
| Standover height | 480 | 480 | 480 |
| Wheel size | 29 in | 29 in | 29 in |
The effective top tube is a fit measurement; BU03 has a step-through frame without a traditional top tube.
Questions about your bike
What is the BU03 designed for?
BU03 is a step-through city and comfort e-bike designed for everyday commuting, urban riding and practical daily transport. Its BAFANG mid-drive system, 720 Wh removable battery and MIK rear rack combine everyday usability with strong riding support.
What motor does the BU03 use?
BU03 uses the Bafang GT800 mid-drive motor with up to 150 Nm of torque. Motor power is 750 W for your selected Ship-to country.
What battery does the BU03 use?
BU03 uses a removable 48 V, 15 Ah, 720 Wh BAFANG battery with LG 21700 cells. The supplied 54.6 V / 3 A charger requires approximately six hours for a full charge under normal conditions.
How do I choose the right frame size?
Use the Size & Fit tool on this page. BU03 is available in S / 420 mm, M / 460 mm and L / 510 mm. The recommended size is calculated from the rider-height ranges for the selected country.
Find your fitDoes the BU03 have a throttle?
The bike shown for your selected Ship-to country includes a throttle. The correct configuration is displayed automatically according to your selected country.
What is the maximum payload?
BU03 supports a maximum payload of 150 kg, excluding the weight of the bicycle itself. Always distribute loads correctly and follow the permitted load limits of individual components such as the rear rack.
What can the G-SPEED Bike App do?
BU03 supports Bluetooth connectivity with the G-SPEED Bike App. Current connectivity is Bluetooth-based; functions requiring cellular, GPS or remote cloud connectivity are not implied.
What warranty does the BU03 include?
BU03 includes a 2-year limited complete-bike warranty and a 5-year limited frame warranty. Warranty terms, exclusions and registration requirements apply, and local statutory consumer rights remain unaffected.
Which safety standard applies?
The BU03 shown lists UL 2849 in its product specifications. Contact our team for information about local requirements.
Have another question about BU03? Ask our team.
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