Reference

Tern GSD Gen 2: parts and specs

Replacement parts and specs for the Tern GSD Gen 2 cargo e-bike (S00 shown): Big Ben Plus 55-406 and Super Moto-X 62-406 tires, Magura MT5 brakes with 180 mm rotors, Gates belt, Bosch Cargo Line, 500 Wh PowerPack and 4A charger.

Last edited Nov 9, 2026 by Pedalwise team Edit History Add a subpage

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Specs are for the stock bike as sold; check your own bike before you buy. This page covers the Tern GSD Gen 2 compact cargo bike, sold from 2020 to 2023 as the S00, S10 and R14. The specs below are for the S00 with the Enviolo hub and Gates belt; other Gen 2 builds (S10, R14) can differ in drivetrain and brakes. The motor is the Bosch Cargo Line mid-drive (85 Nm); see Bosch motors explained. Maximum gross vehicle weight is 200 kg (440 lb), with 100 kg (220 lb) on the rear rack.

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: front Schwalbe Big Ben Plus, 55-406, and rear Tern x Schwalbe Super Moto-X, 62-406, both with Green Guard puncture protection and Reflex sidewalls. Schwalbe's Big Ben Plus in 55-406 (20 x 2.15) is article 11101122, 30 to 55 psi.
Inner tube: 20 inch, to fit 55-406 front and 62-406 rear. Tern's Inner Tube 20" Schwalbe AV-7 Schrader Valve covers 40-62/406 with a 40 mm Schrader valve and fits the GSD series; $8, out of stock (back soon), read Nov 9, 2026.
Disc brake pads: Magura Sport pads. The MT5 takes Magura's MDP 9 pads, made for MT 4-piston brakes.
Brake rotor: 180 mm front and rear.
Disc brake caliper: Magura MT5 4-piston hydraulic, front and rear.
Brake lever: Magura MT5 e-stop hydraulic lever with brake sensor.
E-bike display: Bosch Purion, four modes and walk assist.
E-bike charger: 220V, 4A (EU); 100-240V, 4A (US).
E-bike battery: Bosch dual battery system, 500 Wh or 1000 Wh. The matching pack is the Bosch PowerPack 500 frame battery for System 2.
E-bike lights: Tern Valo Direct headlight (190 lumens) and an always-on RearStop brake light.
Grips: Ergon.
Pedals: Urban platform with non-slip surface and sealed bearings.
Saddle: Tern GSD saddle by Velo, with rear handle.

Tools for common jobs

Hex keys: caliper, stem, rack and seatpost bolts.
Tire levers: changing a 20 inch tube on the wide Atlas rims.
Floor pump with gauge: setting each tire inside its sidewall range.
Torque wrench: brake, rack and stem bolts to the values in your manual.
Brake pad spreader: resetting the four pistons before new pads.
Brake bleed kit: bleeding the Magura MT5 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.
Magura's MDP 9 pads.
Independent sellers: parts suppliers.
A Tern dealer orders and fits Bosch parts: find a shop.

Common repairs

Sources

Stuck after these checks? Find a shop near you.

Need a pro?

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.

Talk

Questions, things that worked for you, or something that looks wrong on this page.

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