New arrival
New arrival

2026 Polygon Tambora G4

By Polygon
$1,399.00 CAD
503016001
Color: White
Size
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Description

TAMBORA: Our Most Versatile Gravel Machine

Gravel | ACX & ALX Frames | 12 Available Builds

Whether you're a long-distance enthusiast or an adventurous explorer, the TAMBORA is here for all your gravel needs. Flip chips at the rear dropouts and fork base let you switch between gravel and all-road geometry in minutes, making the TAMBORA genuinely two-bikes-in-one. With 14 universal mounting points across the frame, it's ready to carry everything your adventure demands.
Technical Specifications

Frameset

  • Frameset: ALX GRAVEL
  • Fork: CARBON RIGID
  • Frame Color: BROKEN WHITE
  • Decal Color: BLACK

Drivetrain

  • Shifter: MICROSHIFT ADVENT X SB-M100, 1x10-SPEED BRIFTER
  • Crank: ALLOY 40T
  • Cassette: MICROSHIFT ADVENT X CS-H104 10 SPEED 11-48T
  • Rear Derailleur: MICROSHIFT ADVENT X M6205GM 10-SPEED
  • BB: THREADED BSA 68mm
  • Chain: KMC X10

Cockpit

  • Saddle: SELLE ITALIA MODEL X
  • Seatpost: ALLOY SEATPOST, DXL: 27,2 x 350mm
  • Handlebar: ALLOY FLARE 16degree, W: 420mm (S, M) / 440mm (L, XL), BB: 31,8mm, R/D: 125mm, B/R: 77mm
  • Handlestem: ALLOY STEM, EXT: 90mm (S, M) / 100mm (L, XL), BB: 31,8mm, R/D: 7degree
  • Headset: TOKEN TK156SP-CHHC W/ SEALED BEARING

Wheel & Tire

  • Wheel Set: ALLOY DOUBLE WALL 32H
  • Tire: VEE RAIL 700x40C 622x40 TLR
  • Rim: ALLOY DOUBLE WALL FV H: 19 622X23 32H TLR
  • Hub: F: ALLOY DISC BRAKE 12x100mm 32H 6B / R: ALLOY DISC BRAKE 12x142mm 32H 6B FOR SPROCKET
  • Spokes: F: STAINLESS 14G NDS:290 & DS:294 W/ NIPPLE BRASS / R: STAINLESS 14G NDS:292 & DS:290 W/ NIPPLE BRASS

Brake

  • Brake Lever: MICROSHIFT ADVENT X SB-M100
  • Brake Caliper: TEKTRO MD-C550 MECHANICAL
  • Rotor: TEKTRO 160mm 6B
Geometry
S M L XL
Height (cm) 150-163 163-175 175-188 188-195
Seat Tube Length (A) 404 448 492 535
Seat Tube Angle (B) 74.5 74 73.5 73
Effective Seat Tube Angle (C) 74.5 74 73.5 73
Head Tube Length (D) 143 163 193 221
Head Tube Angle (E) 70 71.5 71.8 72
Effective Top Tube (F) 526 551 581 611
Bb Height (G) 280 280 280 280
Bb Offset (H) 78 78 78 78
Chainstay Length (I) 425 425 425 425
Wheelbase (J) 1017 1022 1045 1067
Frame Reach (K) 369 381 397 412
Frame Stack (L) 568 593 622 650
Standover Height (M) 716 754 798 833
Product Variants SKU/UPC
  • 2026 Polygon Tambora G4: White / SM: SKU: 503016001 - UPC:
  • 2026 Polygon Tambora G4: White / MD: SKU: 503016002 - UPC:
  • 2026 Polygon Tambora G4: White / LG: SKU: 503016003 - UPC:
  • 2026 Polygon Tambora G4: White / XL: SKU: 503016004 - UPC: