Tambora Series | Polygon Bikes

UNVEIL THE TAMBORA

Swift Adventures Unlocked in One Bike

Drawing inspiration from the birth of bicycles, sparked by the largest volcanic eruption in recorded history, Mount Tambora, we've looked back and reminded ourselves and the world of this history by creating the Polygon Tambora G – a perfect fusion of gravel and all-road capabilities in one extraordinary ride. This bike empowers us to conquer any terrain with newfound speed.

Whether you're a competitive racer, long-distance enthusiast, or an adventurous explorer, this bike is tailored to meet your needs.

POWERFUL SPEED AND UNWAVERING STABILITY

Experience the ultimate ride that combines power and speed with unwavering stability. The wheelbase length ensures stability, while the precise head tube angle instills confidence in your steering and control. No need to compromise between speed, stability, and confidence.

FREE TO CHOOSE: IN A FLIP OF A SWITCH

Unlock the power of choice in your cycling experience, where you can switch between speed and agility or stability and control effortlessly. This innovation transforms your bike from a gravel conqueror, to an all-road explorerwith the flip of a switch and a swift wheelset change.

CONQUER DIVERSE TERRAINS WITH AMPLE TIRE CLEARANCE

A wide tire clearance means a more capable you. Accommodating up to 45c tire. Go through any mixed terrain on any race or adventure, Polygon Tambora G will take you on any terrain with powerful speed.

ENJOY OUR FIRST CARBON GRAVEL BIKE

Introducing our first carbon gravel bike – Polygon Tambora series. Experience seamless power transfer at high speeds and become one with the ride. *Available in Tambora G5, G7, G8X, A5, and A9X

WIRELESS SHIFTING

Experience the ultimate cycling pleasure with Polygon Tambora G8X and Tambora A9X, ensuring a superior shifting experience.

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Build Specs

Kit	TAMBORA A9X	TAMBORA G8X	TAMBORA A5	TAMBORA G7	TAMBORA A4	TAMBORA G5	TAMBORA G4
Frame	ACX GRAVEL	ACX GRAVEL	ACX GRAVEL	ACX GRAVEL	ALX XC TRAIL FRAME	ACX GRAVEL	ALX GRAVEL
Fork	CARBON RIGID	CARBON RIGID	CARBON RIGID	CARBON RIGID	CARBON RIGID	CARBON RIGID	CARBON RIGID
Shifter	SHIMANO GRX Di2 ST-RX825, 2x12-SPEED BRIFTER	SRAM RIVAL ETAP AXS 12-SPEED BRIFTER	SHIMANO GRX ST-RX600, 2x11-SPEED BRIFTER	SRAM APEX 12-SPEED BRIFTER	SHIMANO GRX ST-RX600, 2x11-SPEED BRIFTER	SRAM APEX 1 11-SPEED BRIFTER	MICROSHIFT ADVENT X SB-M100, 1x10-SPEED BRIFTER
Crank Set	SHIMANO GRX FC-RX820, 48x31T	SRAM RIVAL 1 WIDE 40T	PRAXIS ALBA GR M30, 48-32T	SRAM APEX 1 WIDE 40T	PROWHEEL RPZ C701X TT, 48-31T	PRAXIS ALBA GR M30 40T	ALLOY 40T
Cassette	SHIMANO ULTEGRA CS-R8101, 11-34T	SRAM XG-1251 12 SPEED 10-44T XDR	SHIMANO CS-HG700, 11-34T	SRAM XPLR PG-1231 12 SPEED 11-44T	SHIMANO CS-HG700, 11-34T	SRAM PG-1130 11-SPEED 11-42T	MICROSHIFT ADVENT X CS-H104 10 SPEED 11-48T
Rear Derailleur	SHIMANO GRX Di2 RD-RX825	SRAM RIVAL XPLR ETAP AXS 12-SPEED	SHIMANO GRX RD-RX810	SRAM APEX XPLR 12-SPEED	SHIMANO GRX RD-RX810	SRAM APEX 1 11-SPEED	MICROSHIFT ADVENT X M6205GM 10-SPEED
Wheel Set	NOVATEC G24 DISC (28mm) W/ TUBELESS TAPE INSTALLED	NOVATEC G24 DISC (28mm) W/ TUBELESS TAPE INSTALLED	ALLOY DOUBLE WALL 32H	NOVATEC G24 DISC (28mm) W/ TUBELESS TAPE INSTALLED	ALLOY DOUBLE WALL 32H	ALLOY DOUBLE WALL 32H	ALLOY DOUBLE WALL 32H
Tire	MAXXIS RE-FUSE 700X32C	700x40C 622x40 TLR	MAXXIS RE-FUSE 700X32C	700x40C 622x40 TLR	MAXXIS PURSUER 700X32C	VEE RAIL 700x40C 622x40 TLR	VEE RAIL 700x40C 622x40 TLR
Brake Lever	SHIMANO RX825	SRAM RIVAL	SHIMANO ST-RX600	SRAM APEX	SHIMANO ST-RX600	SRAM APEX 1	MICROSHIFT ADVENT X SB-M100
Brake Caliper	SHIMANO GRX RX825 HYDRAULIC DISC	SRAM RIVAL HYDRAULIC DISC	SHIMANO GRX HYDRAULIC DISC	SRAM APEX HYDRAULIC DISC	SHIMANO GRX HYDRAULIC DISC	TRP HD-C711 HY-ROAD	TEKTRO MD-C550 MECHANICAL
Rotor	SHIMANO CL800, 160mm	SRAM PACELINE 160mm CL	SHIMANO RT-CL700, 160mm	SRAM PACELINE 160mm CL	SHIMANO RT-CL700, 160mm	TEKTRO TR-160mm CL	TEKTRO 160mm 6B

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FAQ

Where are the mounts to hold gear? If I wanted to buy a bolted bag, what are the specifications? For full frame and half frame

There are 14 mounts on the Polygon Tambora series; 3 on the top tube, 7 on the down tube, 2 on the seat tube, and a pair of rear carrier mounts. We're using universal-size mounts, so there are no special specifications for the compatible bolted bag. You can freely choose the bolted bag that fits you best.
What is the biggest chainring I can fit?

The maximum chainring of Tambora series is 42T
What are the biggest rotors I can fit?

The biggest rotors for the Tambora series are 160 mm
Can you fit mudguards, pannier racks front and back?

Of course! Tambora Series can be equipped with a rear pannier or rear mudguard.
How do you change the flip chip?

The Tambora has flip chips located at the rear dropouts and the base of the fork, allowing you to easily switch between gravel and all-road configurations. Watch the full video here.
Can I fit a dropper post?

Yes! But it should be a gravel bike dropper post which commonly designed from 50mm to 125mm of travel.
Is it possible to upgrade a road bike to a gravel bike?

This should not be possible because of the small tire clearance and its fixed aggressive geometry.
What is the best configuration for bikepacking gear?

The best configuration of bikepacking typically is a lightweight and compact gear that can bring all of your needs. But it can vary depending on the individual's preferences, the specific trip's requirements, and the terrain being covered.
How does the geometry of Tambora bikes differ from gravel bikes and other road bikes?

The gravel bike has a higher stack, slacker head angle, and longer wheelbase for stability.
What are the gearing differences on gravel vs road bikes?

A gravel bike is using a bigger sprocket than a road bike.