Giant Roam E+ GTS (2021): parts and specs
Replacement parts and specs for the 2021 Giant Roam E+ GTS: Crosscut Gravel 2 700 x 45c tires, Tektro M275 hydraulic brakes with 180 and 160 mm rotors, Shimano 9-speed, RideControl One, EnergyPak 400Wh battery and 3A charger.
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Specs are for the stock bike as sold; check your own bike before you buy.
This page covers the 2021 Giant Roam E+ GTS hybrid. It runs the Giant SyncDrive Core mid-drive motor (50 Nm), built by Yamaha; see Yamaha e-bike motors explained. Both wheels use quick-release alloy disc hubs. On the plain Roam E+ or a later year, match the parts on your bike before you order.
Photo needed: The Roam E+ GTS from the drive side, showing the 9-speed cassette and quick-release rear wheel.. Add one
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, controller, motor or display. Motor and battery service on this bike is dealer work: a Giant dealer reads faults and updates firmware with its diagnostic tool.
Parts list
- Tire: Giant Crosscut Gravel 2, tubeless, 700 x 45c.
- Brake rotor: 180 mm front, 160 mm rear.
- Disc brake caliper: Tektro M275 hydraulic.
- Brake lever: Tektro M275.
- Chain: KMC X9, e-bike rated.
- Cassette: Shimano HG200, 9-speed, 11 to 36, with a Shimano Alivio rear derailleur.
- E-bike display: Giant RideControl One controller with ANT+; takes an optional wireless display.
- E-bike charger: Giant EnergyPak 3A fast charger.
- E-bike battery: Giant EnergyPak 400Wh, 36V, 11.3Ah lithium-ion.
- Pedals: platform.
- Saddle: Giant Sport Comfort, on a 30.9 mm alloy seatpost.
Tools for common jobs
- Hex keys: caliper, stem, handlebar and seatpost bolts.
- Tire levers: changing a tube or seating a tire.
- Floor pump with gauge: setting pressure within the sidewall range.
- Torque wrench: brake, stem and pedal bolts, to your manual's values.
- Pedal wrench: swapping pedals; see replace pedals.
- Brake pad spreader: resetting the pistons before new pads.
- Brake bleed kit: bleeding the Tektro brakes, which use mineral brake oil; see bleed Tektro brakes.
- Chain checker: catching chain wear early.
- Chain lube: after cleaning and wet rides.
- Chain tool: sizing a new chain.
- Multimeter: testing charger output at its plug, as in check your charger. Never probe the battery.
Where to buy
- Independent sellers: parts suppliers.
- A Giant dealer orders and fits the EnergyPak battery, charger and RideControl parts: find a shop.
Common repairs
- Giant SyncDrive troubleshooting and update e-bike firmware
- Replace disc brake pads, bed in disc brakes and fix a spongy brake lever
- Set tire pressure and e-bike flat tire
- Clean and lube the chain, check and replace the chain and adjust the rear derailleur
- Battery won't charge and e-bike battery care
Sources
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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