Vektron P5i · Gen 4 · 1×5 IGH · Gates Belt · Bosch BES2 Performance
Vektron P5i
Full-size Bosch power in a bike that folds in 10 seconds — rolls through train stations, stands in a corner, and tucks into a car boot without a second thought.
The Tern Vektron P5i Gen 4 is what a folding e-bike should be — a real bike that happens to fold, not a compromised bike that happens to have a motor. The Gen 4 OCL+ frame joint is engineered beyond ISO 4210 and EN 15194 requirements; the Bosch BES2 Performance motor delivers smooth, natural-feeling assist; and the Gates Carbon Drive CDC belt with Shimano Nexus 5 hub means no chain, no grease, and practically no maintenance. Fold it in 10 seconds, roll it on its rack ends through a train station, stand it upright in your apartment. It's the bike you take everywhere — including places you normally can't take a bike.
Highlights
Folds in 10 seconds — stands upright, rolls when folded
A few lever flips and the Vektron folds to 42×85×69 cm. The rear rack ends let it stand upright independently or roll through a train station, office lobby, or elevator on one hand — no carrying required.
Gates Carbon Drive CDC belt — zero maintenance
No chain, no grease, no lube — ever. The Gates CDC belt is silent, clean, and vastly outlasts any chain. A key reason the P5i is the right pick for riders who carry the folded bike and don't want grease near their clothes or car interior.
Shimano Nexus 5 IGH — 263% range, twist shifter
Five internally geared speeds shift smoothly at any cadence, including at a standstill. The 263% range covers urban terrain and mild gradients comfortably, with a 34"–90" gear spread. No derailleur to snag, no exposed gears to clog.
Bosch BES2 Performance motor — 65 Nm, 300% assist
The Bosch BES2 Performance motor delivers 65 Nm of torque and 300% pedal assist — smooth, progressive, and efficient for urban commuting. Bosch Intuvia display with 4-mode selection and walk assist, keyed-alike frame lock with battery. Upgrade to the 500 Wh PowerPack for extended range — both battery sizes are interchangeable on BES2 bikes.
OCL+ frame joint — over-engineered by design
Tern's Gen 4 heavy-duty OCL+ hinge exceeds ISO 4210 and EN 15194 requirements — single-shaft design, advanced welding, robust gussets, and four igus bearings between moving parts. The fold stays stiff and precise ride after ride.
Magura MT4 hydraulic disc brakes
Magura MT4 hydraulic discs front and rear — mineral oil-based, excellent modulation, and effortless to operate with two fingers in rain, snow, or mud.
Atlas V rear rack — multi-system compatible, 27 kg
Integrated 8-point mounting Atlas V rack supports 27 kg and is compatible with KLICKfix, Racktime SNAPIT 2.0, and Ortlieb Quick-Lock 2.1 & 2.2. Hidden luggage socket for front-mounted accessories too.
Adjustable cockpit — fits 147–195 cm, no tools
Physis 3D handlepost, Andros adjustable stem, and Telescope seatpost resize in seconds without tools to fit riders from 4'10" to 6'5". Share it across the household without fuss.
EN 15194 + UL 2849 certified · 10-year warranty
Third-party tested for EN 15194 e-bike compliance and UL 2849 electrical/fire safety. Frame backed by a 10-year limited warranty (register with Tern Care) plus a 7-year parts availability pledge on motor and battery.
Available colours
E-System
| Motor | Bosch BES2 Performance, 65 Nm, 300% assist, max 32 km/h |
| Battery system | Bosch BES2 (legacy system) |
| Battery (equipped) | 400 Wh Bosch PowerPack, removable |
| Battery (max single) | 500 Wh Bosch PowerPack (upgrade available) |
| Dual-battery | Not available |
| Range — 400 Wh | 45–112 km (28–70 mi) |
| Range — 500 Wh | ~56–140 km (est.) |
| Display | Bosch Intuvia, 4-mode, walk assist |
| Charger | 220–240V, 4A |
Drivetrain
| Shifter | Shimano Nexus, 5-speed, twist |
| Rear hub | Shimano Nexus 5, internally geared, 263% range |
| Belt | Gates Carbon Drive CDC |
| Crankset | Tern custom, Gates CDX CNC machined beltring |
| Cog | Gates CDX, precision CNC machined |
| Bottom bracket | Motor integrated |
| Gear range | 34"–90" (2.75–7.22 m) |
| Pedals | MKS EZY |
Brakes
| Front brake | Magura MT4 hydraulic disc |
| Rear brake | Magura MT4 hydraulic disc |
| Levers | Magura hydraulic disc |
Wheels & Tires
| Wheel size | 20" (406) |
| Front hub | Disc, aluminium |
| Rear hub | Shimano Nexus 5 |
| Rims | Kinetix Comp, for disc |
| Tires | Schwalbe Big Apple Performance Line, 55-406, puncture protection, Reflex |
| Spokes | Stainless steel |
Frame & Cockpit
| Frame | Tern Vektron Gen 4, 6061-AL hydroformed, OCL+ joint, 3 patented technologies |
| Fork | Tern Tarsus, 6061-AL hydroformed |
| Handlepost | Tern Physis 3D, 3D forged, 5 patented technologies, 12°, 350mm |
| Stem | Tern Andros, adjustable, forged, patented technology |
| Handlebar | Tern Sweep, 6061-AL, Tern Andros adapted |
| Headset | Tern Flux by FSA, cartridge bearings, Physis integrated |
| Saddle | Tern Upright by Velo |
| Seatpost | Tern Telescope, 34.9/30.9mm |
| Grips | Ergon |
Load & Capacity
| Max GVW | 125 kg (276 lb) |
| Max rider weight | 105 kg (232 lb) |
| Rack capacity | 27 kg (59.5 lb) |
| Rack | Atlas V — integrated 8-point mounting, KLICKfix / Racktime SNAPIT 2.0 / Ortlieb Quick-Lock 2.1 & 2.2 compatible |
| Frame lock | ABUS, keyed-alike with Bosch battery |
| Clip system | Magnetix 3.0 |
| Rider height range | 147–195 cm (4'10"–6'5") |
| Frame sizes | One size |
Dimensions & Folding
| Folded size | 42×85×69 cm (16.5×33.5×27.2 in) |
| Fold time | ~10 seconds |
| Weight | 23.6 kg (52 lb) |
Extras
| Front light | Tern Valo Direct, 190 lumens |
| Rear light | Herrmans |
| Fenders | SplashGuard, stainless hardware |
| Chainguard | Tern custom, full chain cover |
| Kickstand | Ursus, rear mount |
| Luggage socket | Yes |
| Warranty | 10-year limited (frame, fork, handlepost) — register with Tern Care |
| Parts availability | 7-year guarantee (motor, battery, charger) |
Tern Vektron P5i · Gen 4 · One Size · Urban Verdant