Polygon Tambora AE GRX
Road-legal status is not yet verified for this model.
Polygon Tambora AE GRX (2025) at a glance
The Polygon Tambora AE GRX is a carbon electric gravel bike with a Bosch Performance Line SX motor (55Nm), a 400Wh battery (up to 78km), Shimano GRX 12-speed and hydraulic brakes, 700 x 40c tyres and about 20kg.
The Polygon Tambora AE GRX is a commuter e-bike sold in Australia at $7,499.99 (price checked 27 Sep 2026). It pairs a Bosch Performance Line SX mid drive motor with 55Nm of torque, a 400Wh battery rated for up to 78km, 700 x 40c Schwalbe G-One wheels, and weighs 20kg.
Is it for you?
Best suited to
Gravel riders who want the carbon Tambora AE with mechanical Shimano GRX for less money.
Standout strength
The same carbon frame, Bosch SX motor and 400Wh battery as the GX, with Shimano GRX 12-speed, for less money.
The main compromise
Mechanical rather than wireless shifting, and the fixed 400Wh battery is small for long days.
Full specification
Drive and power
Frame and ride
Australian compliance
Road-legal status is not yet verified for this model.
Tambora AE GRX vs Tambora AE GX
| Polygon Tambora AE GRX | Polygon Tambora AE GX | |
|---|---|---|
| Price | $7,499.99 | $8,999.99 |
| Motor | Bosch Performance Line SX, mid drive | Bosch Performance Line SX, mid drive |
| Torque | 55 Nm | 55 Nm |
| Battery | 400 Wh | 400 Wh |
| Claimed range | 78 km | 78 km |
| Weight | 20 kg | 20 kg |
| Frame | ACX carbon e-gravel frame, 120kg max load | ACX carbon e-gravel frame, 120kg max load |
| Wheels | 700 x 40c Schwalbe G-One | 700 x 40c Schwalbe G-One |
| Category | Commuter | Commuter |
| Availability | Out of stock | Out of stock |
Choose the Tambora AE GRX if
it costs $1,500 less.
Choose the Tambora AE GX if
you prefer its frame, fit or finish; the core numbers are close, so fit and dealer support should decide it.
How you would ride it
Polygon
Polygon sells its Australian e-bike range direct at polygonbikes.com/au and through dealers: Siskiu and Collosus eMTBs with Shimano and Bosch motors, the carbon Tambora AE e-gravel bike, and Kalosi and Gili city e-bikes.
Compare similar e-bikes
Common questions
How much does the Polygon Tambora AE GRX cost in Australia?
The Polygon Tambora AE GRX is listed at $7,499.99 (Polygon Australia RRP (polygonbikes.com/au)). eBikeFinder checks pricing against manufacturer and distributor information, and prices can change with sales and stock. This price was last checked on 27 Sep 2026.
Is the Polygon Tambora AE GRX road legal in Australia?
Its compliance is listed as unverified on eBikeFinder. A road-legal Australian e-bike is limited to 250W of pedal-assist power that cuts out at 25 km/h, with any throttle capped at 6 km/h. Confirm the Polygon Tambora AE GRX meets those limits with the seller before riding on the road.
What is the range of the Polygon Tambora AE GRX?
The Polygon Tambora AE GRX has a claimed range of about 78 km from its 400Wh battery. Real-world range is usually lower than the claim, since it depends on assist level, rider weight, terrain and wind.
What motor does the Polygon Tambora AE GRX have?
The Polygon Tambora AE GRX uses a Bosch Performance Line SX motor, in a mid-drive position, producing 55Nm of torque. Mid-drive motors climb hills better because they work through the bike's gears.
How much does the Polygon Tambora AE GRX weigh?
The Polygon Tambora AE GRX weighs about 20 kg. That matters if you need to lift it onto a car rack, carry it up stairs, or store it, since e-bikes are heavier than regular bikes because of the motor and battery.
Who sells and backs the Polygon Tambora AE GRX in Australia?
The Polygon range is distributed in Australia by Polygon Bikes Australia (direct online) and Polygon dealers. It comes with a 2 years frame, lifetime fork on select models warranty. Buying from a brand with real Australian support matters most when something needs a warranty claim or a service.