New arrival
New arrival

2026 Polygon Tambora G8X

By Polygon
$4,699.00 CAD
503013001
Color: Brown
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: ACX GRAVEL
  • Fork: CARBON RIGID
  • Frame Color: MAROON BROWN
  • Decal Color: CHARCOAL

Drivetrain

  • Shifter: SRAM RIVAL ETAP AXS 12-SPEED BRIFTER
  • Crank: SRAM RIVAL 1 WIDE 40T
  • Cassette: SRAM XG-1251 12 SPEED 10-44T XDR
  • Rear Derailleur: SRAM RIVAL XPLR ETAP AXS 12-SPEED
  • BB: SRAM DUB T47
  • Chain: SRAM RIVAL 12-SPEED

Cockpit

  • Saddle: SELLE ITALIA MODEL X
  • Seatpost: CARBON, DXL: 27,.2 x 300mm (S,M,L) / 27.2 x 350mm (XL)
  • 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 TK155SP-36 W/ SEALED BEARING

Wheel & Tire

  • Wheel Set: NOVATEC G24 DISC (28mm) W/ TUBELESS TAPE INSTALLED
  • Tire: 700x40C 622x40 TLR
  • Rim: CARBON FV H: 28 622x24 24H FOR TYRE 622-35/68 TLR
  • Hub: F: NOVATEC D791 12x100mm 24H CL / R: NOVATEC D792 12x142mm 24H CL FOR XDR
  • Spokes: F: STAINLESS DOUBLE BUTTED 14G NDS:282mm DS:284mm W/ NIPPLE BRASS / STAINLESS DOUBLE BUTTED 14G NDS:284mm DS:282mm W/ NIPPLE BRASS

Brake

  • Brake Lever: SRAM RIVAL
  • Brake Caliper: SRAM RIVAL HYDRAULIC DISC
  • Rotor: SRAM PACELINE 160mm CL
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) 716 755 798 833
Product Variants SKU/UPC
  • 2026 Polygon Tambora G8X: Brown / SM: SKU: 503013001 - UPC:
  • 2026 Polygon Tambora G8X: Brown / MD: SKU: 503013002 - UPC:
  • 2026 Polygon Tambora G8X: Brown / LG: SKU: 503013003 - UPC:
  • 2026 Polygon Tambora G8X: Brown / XL: SKU: 503013004 - UPC: