Tern HSD P5i Gen 3: parts and specs
Replacement parts and specs for the Tern HSD P5i Gen 3 compact cargo e-bike: Schwalbe Big Apple 55-406 tires, Magura hydraulic brakes with 180 mm rotors, Gates belt, Shimano Nexus 5, PowerPack 540 or 545, Purion 200 and a 4A charger.
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Specs are for the stock bike as sold; check your own bike before you buy. This page covers the Tern HSD P5i Gen 3 compact cargo bike from 2024 on, a one-passenger hauler on 20 inch wheels. It uses the Bosch Performance Line (BDU34, 75 Nm) mid-drive on the Bosch smart system; see Bosch motors explained. Drive is a Gates Carbon Drive CDX belt into a Shimano Nexus 5 hub. Other HSD Gen 3 builds (S00, P00) can differ in drivetrain, brakes and display, so match the part on your bike before you order.
Electrical parts on this list must match this exact model and are fitted at the external plugs or by a pro. Never open the battery, motor, display or charger. Battery and motor service on the Bosch system is dealer work: a Bosch dealer reads faults with its diagnostic tool and updates the software.
Parts list
- Tire: Schwalbe Big Apple, 55-406, with puncture protection and Reflex sidewalls, on Tern Atlas H cargo rims.
- Inner tube: 20 inch, to fit 55-406. Tern's Inner Tube 20" Schwalbe AV-7 Schrader Valve covers 40-62/406 with a 40 mm Schrader valve and fits the HSD series; $8, out of stock (back soon), read Nov 9, 2026.
- Brake rotor: 180 mm front and rear.
- Disc brake caliper: Magura hydraulic disc, front and rear.
- Brake lever: Magura hydraulic.
- E-bike display: Bosch Purion 200, with eBike Flow app connection and electronic bike lock.
- E-bike charger: Fast charging, 100-240V, 4A (US). The Bosch 4A Charger is part of the smart system lineup.
- E-bike battery: Bosch PowerPack 540 or 545. Both are Bosch smart system frame batteries that fill in about 4.9 hours on the 4A charger.
- E-bike lights: Tern Valo Direct headlight (190 lumens) and a Herrmans LED taillight.
- Grips: Ergon.
- Pedals: Urban platform with non-slip surface and sealed bearings.
- Saddle: Tern by Velo.
Tools for common jobs
- Hex keys: caliper, stem, rack and seatpost bolts.
- Tire levers: changing a 20 inch tube.
- Floor pump with gauge: keeping the Big Apple tires inside the sidewall range.
- Torque wrench: brake and rack bolts to the values in your manual.
- Brake pad spreader: resetting the pistons before new pads.
- Brake bleed kit: bleeding the Magura brakes when the lever goes soft; see bleed Magura brakes.
- Multimeter: testing the charger at its plug, as in check your charger. Never probe the battery.
Where to buy
- Tern's 20 inch Schrader tube.
- Bosch frame batteries and chargers through a Tern or Bosch dealer.
- Independent sellers: parts suppliers.
- A Tern dealer orders and fits Bosch parts: find a shop.
Common repairs
- Tern e-bike troubleshooting
- Bosch e-bike troubleshooting and Bosch error codes
- Replace disc brake pads, bed in disc brakes and fix a spongy brake lever
- Set tire pressure and e-bike flat tire
- E-bike battery care, battery won't charge and update e-bike firmware
- Check bolts and torque and the e-bike maintenance schedule
Sources
- ternbicycles.com
- Inner Tube 20" Schwalbe AV-7 Schrader Valve, store.ternbicycles.com
- 4A Charger, bosch-ebike.com
- frame batteries, bosch-ebike.com
Stuck after these checks? Find a shop near you.
If these steps didn't fix it, find a shop near you in our partner network. For battery or wiring trouble, look for shops marked Battery and electrical.
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