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2025 Polygon

Tambora AE

A carbon frame gravel e-bike with high-end components and shimano grx 800 hydraulic disc brakes.
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Manufacturer Price

$3,999$4,099
FrameCarbon
SuspensionRigid
ForkCarbon
Wheels700c Carbon
Drivetrain1 × 12
GroupsetGRX 800
MotorBosch 600W 63Nm mid-drive
BatteryBosch 400Wh
BrakesShimano GRX 800 Hydraulic Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Rider Position
relaxedaggressive
Tambora AE
Other Gravel bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

38 mph

Tambora AE

36 mph

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Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Compare the full Tambora AE model range

View Comparison
Sizing
SM

5'1" – 5'9"

MD

5'6" – 5'11"

LG

5'8" – 6'3"

XL

6'0" – 6'6"

Rider Fit Notes

None yet.

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Price History
Geometry
Specs
Build
Frame

ACX Carbon Gravel Frame

BB StandardT47, Threaded

Tire Clearance45c

Fork

Full Carbon, Steerer: Taper 1-1/8" to 1-1/2", Brake Type: Disc Brake Flat 140mm, Hub Spacing: 12x100mm for TA M12x1.5 L:120mm

Bottom Bracket

T47, threaded

Headset

FSA NO.55R 1.5"/CR/LS, IS 52/28.6 | IS 52/40

Stem

Vision NS SMR-II ST, Extension: 90mm (S-M), 100mm (L-XL), Bar Bore: 31.8mm, Rise/Drop: 10 degrees

Handlebar

FSA Energy Super Compact, Width: 400mm (S-M), 420mm (L-XL), Rise: 120mm, Bend: N/A, Bar Bore: 31.8mm

Saddle

Fizik Terra Argo, Steel ø 7mm

Seatpost

Carbon, DXL: 27.2 x 300mm (S), 27.2 x 350mm (M-XL), Seatpost Clamp: Alloy Integrated

TypeRigid

Pedals

Not Included

Groupset
Rear Derailleur

Shimano GRX RD-RX822 12-Speed

Crank

44T

Shifters

Shimano GRX BR-RX820 12-Speed Brifter

Cassette

Shimano CS-M8100 XT 12-Speed 10-51T Microspline

Chain

Shimano CN-M6100 12-Speed

Brakes

Front: Shimano GRX Hydraulic, Lever: Shimano GRX ST-RX820, Rear: Shimano GRX Hydraulic, Lever: Shimano GRX ST-RX820

TypeShimano GRX 800 Hydraulic Disc

Wheels
Rims

Novatec G24 Disc (28mm) with Tubeless Tape Installed, Rim: Carbon FV H: 24 622x24 24H for Tyre 622-35/68 TLR

Front Hub

Novatec D791 12x100mm 24H CL

Rear Hub

CL-142 12x142mm 24H CL for Microspline

Tires

Schwalbe G-One 700C-40 622x40 Allround Tire TLE Addix

Disc Rotors

Shimano RT-CL800 Centerlock 160mm

Electric Components
Motor

Bosch Performance Line Sprint BDU3184

Battery

Bosch Performance Line Sprint 400Wh & Powermore 250Wh Range Extender

Display

Bosch System Controller BRC3100

Charger

Bosch 2 Ampere Compact Charger

Rider Notes
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First added August 31

Last updated May 30