TAMBORA SERIES
Gravel | ACX & ALX Frames | 12 Available Builds
- TAMBORA G8X
- TAMBORA A5
- TAMBORA A4
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- TAMBORA G5
- TAMBORA G4
Features
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ACX Carbon Frame
Specifically tuned to balance lightweight performance with vibration damping, the ACX carbon frame is engineered to absorb chatter, allowing you to ride further with less fatigue.
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Flip Chip Geometry
Flip chips located at the rear dropouts and the base of the fork allowing you to extend the wheelbase, easily switching between snappy handling or more stable configurations.
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45c tire clearance
Increased tire clearance increases comfort and capability on mixed terrain.
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Frame and accessory mounts
With up to 14 universal mounts , there's plenty of scope to attach any bag or kit that suits your adventure.
Choose your series
Build Specs
| Kit |
TAMBORA G8X
|
TAMBORA A5
|
TAMBORA A4
|
TAMBORA G5
|
TAMBORA G4
|
|---|---|---|---|---|---|
| Frame | ACX GRAVEL | ACX GRAVEL | ALX XC TRAIL FRAME | ACX GRAVEL | ALX GRAVEL |
| Fork | CARBON RIGID | CARBON RIGID | CARBON RIGID | CARBON RIGID | CARBON RIGID |
| Shifter | SRAM RIVAL ETAP AXS 12-SPEED BRIFTER | SHIMANO GRX ST-RX600, 2x11-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 | SRAM RIVAL 1 WIDE 40T | PRAXIS ALBA GR M30, 48-32T | PROWHEEL RPZ C701X TT, 48-31T | PRAXIS ALBA GR M30 40T | ALLOY 40T |
| Cassette | SRAM XG-1251 12 SPEED 10-44T XDR | SHIMANO CS-HG700, 11-34T | SHIMANO CS-HG700, 11-34T | SRAM PG-1130 11-SPEED 11-42T | MICROSHIFT ADVENT X CS-H104 10 SPEED 11-48T |
| Rear Derailleur | SRAM RIVAL XPLR ETAP AXS 12-SPEED | SHIMANO GRX RD-RX810 | 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 | ALLOY DOUBLE WALL 32H | ALLOY DOUBLE WALL 32H | ALLOY DOUBLE WALL 32H | ALLOY DOUBLE WALL 32H |
| Tire | 700x40C 622x40 TLR | MAXXIS RE-FUSE 700X32C | MAXXIS PURSUER 700X32C | VEE RAIL 700x40C 622x40 TLR | VEE RAIL 700x40C 622x40 TLR |
| Brake Lever | SRAM RIVAL | SHIMANO ST-RX600 | SHIMANO ST-RX600 | SRAM APEX 1 | MICROSHIFT ADVENT X SB-M100 |
| Brake Caliper | SRAM RIVAL HYDRAULIC DISC | SHIMANO GRX HYDRAULIC DISC | SHIMANO GRX HYDRAULIC DISC | TRP HD-C711 HY-ROAD | TEKTRO MD-C550 MECHANICAL |
| Rotor | SRAM PACELINE 160mm CL | SHIMANO RT-CL700, 160mm | SHIMANO RT-CL700, 160mm | TEKTRO TR-160mm CL | TEKTRO 160mm 6B |
FAQ
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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.
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What is the biggest chainring I can fit?
The maximum chainring of Tambora series is 42T
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What are the biggest rotors I can fit?
The biggest rotors for the Tambora series are 160 mm
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Can you fit mudguards, pannier racks front and back?
Of course! Tambora Series can be equipped with a rear pannier or rear mudguard.
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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.
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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.
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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.
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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.
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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.
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What are the gearing differences on gravel vs road bikes?
A gravel bike is using a bigger sprocket than a road bike.