Polygon Tambora A4 - Gravel Bike
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Details

ALL-DAY VERSATILITY

ALL-DAY VERSATILITY

The Tambora A4 delivers the perfect blend of road efficiency and gravel capability. Its lightweight ALX alloy frame and carbon fork offer a responsive yet comfortable ride, supported by endurance-tuned geometry that keeps riders steady over long distances and varied surfaces.

SMOOTH PERFORMANCE

SMOOTH PERFORMANCE

The Shimano GRX 2×11 drivetrain delivers precise shifting and a wide gear range when fully loaded, while hydraulic disc brakes ensure reliable stopping power. Maxxis 32c tires balance speed with cushioning for smoother rides on rough roads. Tubeless-ready wheels unlock more grip and puncture protection when paired with tubeless tires, and dropper-post compatibility adds control when the terrain gets rough.

ADAPTABLE FLIP-CHIP

ADAPTABLE FLIP-CHIP

Tailor your ride with Polygon’s user-friendly flip-chip—position the bike in ‘short’ mode for roadrace handling or ‘long’ mode for precise control on gravel. With up to 45mm tire clearance, the Tambora A4 transforms effortlessly from smooth roads to packed gravel

DESIGNED FOR ADVENTURE

DESIGNED FOR ADVENTURE

With 14 universal mounts across the frame (top tube, down tube, seat tube, and dual rear carrier mounts), the Tambora A4 accommodates racks, frame bags, and bottles—making it exceptionally capable for long rides and lightweight bikepacking. Rear fender and carrier compatibility expand your adventure-ready setup.

SHIMANO GRX 2×11 DRIVETRAIN
SHIMANO GRX 2×11 DRIVETRAIN A 48/31T chainring paired with an 11–34T cassette delivers both climbing range and high-speed efficiency. Textured levers improve grip on rough terrain, while the Shadow+ clutch keeps the chain quiet and secure over bumps.
GRX HYDRAULIC DISC BRAKES
GRX HYDRAULIC DISC BRAKES Shimano GRX RX810 brakes with 160 mm Ice-Tech rotors ensure fade-free stopping on long descents. The steel–aluminum rotor construction sheds heat quickly, while Servo Wave technology engages the pads faster for precise control with less lever travel.
Any questions? Chat to our friendly team
Specs
frameset
FrameALX XC Trail Aluminum, 14 Universal Mounts, Flip‑Chip Adjustable Geometry, 12 × 142 mm Rear Spacing, Flat‑Mount
HeadsetToken TK156SP‑36, Sealed Bearing, ZS 56/28.6 | ZS 56/40
suspension
ForkCarbon Rigid, Tapered Steerer, Flip‑Chip, Internal Routing, 12 × 100 mm Spacing, Flat‑Mount
drivetrain
Rear derailleurShimano GRX RD‑RX810, 11‑Speed
Front derailleurShimano GRX FD‑RX810, 11‑Speed
ShifterShimano GRX ST‑RX600, 2×11‑Speed
CrankProwheel RPZ C701X TT
Chainring48/31T
CassetteShimano CS‑HG700, 11‑34T, 11‑Speed
ChainKMC X11
brakes
Front brakeShimano GRX Hydraulic Disc, Flat‑Mount
Rear brakeShimano GRX Hydraulic Disc, Flat‑Mount
RotorShimano RT‑CL700, 160 mm
wheels
Front hubNovatec D791SB, 32H, Center Lock, Sealed Cartridge Bearings, Thru‑Axle, 12 × 100 mm
Rear hubNovatec D792SB, 32H, Center Lock, Sealed Cartridge Bearings, HG Freehub, Thru‑Axle, 12 × 142 mm
RimPolygon Alloy Double‑Wall, 20 mm Inner Width, 622 × 32H, Tubeless‑Ready *
TyreMaxxis Pursuer, 700 × 32C **
Max tyre size 45mm [Long setting] | 35mm [Short setting]
contact points
HandlebarPolygon Expert, 420 mm (S, M) / 440 mm (L, XL), 31.8 mm Clamp, 125 mm Drop, 77 mm Reach
GripsBar Tape
SaddleLINC Flux 2
SeatpostPolygon Expert, 27.2 × 400 mm
StemPolygon Expert, 90 mm (S, M) / 100 mm (L, XL), 31.8 mm Clamp, 7° Rise
weight
Bike weight23.37 lb. ( Size M )
Geo

Flip Chip Setup
LONG (GRAVEL)
SHORT (ALL-ROAD)
Frame Size S M L XL
Rider Height 4'11" – 5'4" 5'4"–5'9" 5'9"–6'2" 6'2"–6'5"
(A) Frame Stack 568 593 622 650
(B) Frame Reach 369 381 397 412
(C) Head Tube Angle 70° 71.5° 71.8° 72°
(D) Head Tube Length 143 163 193 221
(E) Seat Tube Angle 74.5° 74° 73.5° 73°
Effective Seat Tube Angle 74.5° 74° 73.5° 73°
(F) Seat Tube Length 404 448 492 535
(G) Effective Top Tube 526 551 581 611
(H) Bottom Bracket Height 280 280 280 280
(I) Bottom Bracket Drop 78 78 78 78
(J) Chainstay Length 425 425 425 425
(K) Wheelbase 1017 1022 1045 1067
(L) Standover Height 716 755 798 833
Frame Size S M L XL
Rider Height 4'11" – 5'4" 5'4"–5'9" 5'9"–6'2" 6'2"–6'5"
(A) Frame Stack 566 591 621 648
(B) Frame Reach 371 383 400 415
(C) Head Tube Angle 70.25° 71.77° 72.06° 72.26°
(D) Head Tube Length 143 163 193 221
(E) Seat Tube Angle 74.75° 74.26° 73.76° 73.26°
Effective Seat Tube Angle 74.75° 74.26° 73.76° 73.26°
(F) Seat Tube Length 404 448 492 535
(G) Effective Top Tube 526 550 581 610
(H) Bottom Bracket Height 265 265 265 265
(I) Bottom Bracket Drop 79 79 79 79
(J) Chainstay Length 415 415 415 415
(K) Wheelbase 997 1003 1026 1048
(L) Standover Height 701 741 784 819


* All measurements are in mm except for rider height.

Build

2024 Polygon Tambora G4

Your bike needs minor assembly before riding; use the tools and videos included.

As a guide, it'll take 10-40min depending on whether you're an experienced bike assembler or have little to no mechanical experience.

Side Note: Your cables will stretch during the initial bed-in period and must be adjusted by an experienced mechanic around 150km of riding.

  1. Unboxing Your Tambora G4

  2. Dial In Your Bike Fit

  3. Dial In Your Tyre Pressures

  4. Pre-Ride Check