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2025 Polygon

TAMBORA A4

An aluminum frame gravel bike with high-end components and shimano grx 600 hydraulic disc brakes.
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Manufacturer Price

$1,799
Price History
FrameAluminum
SuspensionRigid
ForkCarbon
Wheels700c Aluminum
Drivetrain2 × 11
GroupsetGRX 800, GRX 600
BrakesShimano GRX 600 Hydraulic Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Rider Position
relaxedaggressive
Terrain
smoothrugged
TAMBORA A4
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 A4

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 model range

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Sizing
SM

4'11" – 5'5"

MD

5'3" – 5'10"

LG

5'8" – 6'3"

XL

6'1" – 6'5"

Rider Fit Notes
  • 5'5", size SM, Fits small
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Price History
Reviews
99 Spokes
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The Polygon Tambora G7 packs a ton of features (adjustable geometry anyone!) into a low its small price tag! But high value on ...

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Geometry
Specs
Build
Frame

aluminum

BB Standard: BSA, 68mm, Threaded

Tire Clearance: 45c

Color: Charcoal - Blue

Fork

CARBON RIGID

Bottom Bracket

BSA, 68mm

Headset

TOKEN TK156SP-36 W/ SEALED BEARING, ZS 56/28.6 | ZS 56/40

Stem

Polygon Expert, 90 mm (S, M) / 100 mm (L, XL), 31.8 mm Clamp, 7° Rise

Handlebar

POLYGON EXPERT, W: 420mm (S, M) / 440mm (L, XL), BB: 31.8mm, R/D: 125mm, B/R: 77mm

Saddle

LINC FLUX 2

Seatpost

POLYGON EXPERT, DxL: 27.2x400mm

Type: Rigid

Grips

Bar Tape

Groupset
Rear Derailleur

SHIMANO GRX RD-RX810

Front Derailleur

Shimano GRX FD‑RX810, 11‑Speed

Crank

PROWHEEL RPZ C701X TT, 48-31T

Shifters

SHIMANO GRX ST-RX600, 2x11-SPEED BRIFTER

Cassette

SHIMANO CS-HG700, 11-34T

Chain

KMC X11

Brakes

SHIMANO GRX HYDRAULIC DISC

Type: Shimano GRX 600 Hydraulic Disc

Brake Levers

SHIMANO ST-RX600

Wheels
Rims

F: ALLOY DOUBLE WALL FV H: 20 622 32H TLR / R: ALLOY DOUBLE WALL FV H: 20 622 32H TLR

Spokes

F: STAINLESS 14G NDS:290 & DS:292 W/ NIPPLE BRASS / R: STAINLESS 14G NDS:292 & DS290: W/ NIPPLE BRASS

Front Hub

NOVATEC D791SB 12x100mm 32H CL

Rear Hub

NOVATEC D792SB 12x142mm 32H CL FOR SPROCKET

Tires

MAXXIS PURSUER 700X32C

Disc Rotors

SHIMANO RT-CL700, 160mm

Rider Notes
Riders Also Viewed

First added May 3

Last updated June 1