New arrival
New arrival

2026 Polygon Tambora A4

By Polygon
$1,999.00 CAD
503328001
Color: Charcoal Blue
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 XC TRAIL FRAME
  • Fork: CARBON RIGID
  • Size: S, M, L, XL
  • Frame Color: CHARCOAL - BLUE
  • Decal Color: SILVER

Drivetrain

  • Shifter: SHIMANO GRX ST-RX600, 2x11-SPEED BRIFTER
  • Crank: PROWHEEL RPZ C701X TT, 48-31T
  • Cassette: SHIMANO CS-HG700, 11-34T
  • Rear Derailleur: SHIMANO GRX RD-RX810
  • BB: BSA, 68mm
  • Chain: KMC X11

Cockpit

  • Saddle: LINC FLUX 2
  • Seatpost: POLYGON EXPERT, DxL: 27.2x400mm
  • Handlebar: POLYGON EXPERT, W: 420mm (S, M) / 440mm (L, XL), BB: 31.8mm, R/D: 125mm, B/R: 77mm
  • Handlestem: POLYGON EXPERT, EXT: 90mm (S, M) / 100mm (L, XL) , BB: 31.8mm, R/D: 7degree
  • Headset: TOKEN TK156SP-36 W/ SEALED BEARING, ZS 56/28.6 | ZS 56/40

Wheel & Tire

  • Wheel Set: ALLOY DOUBLE WALL 32H
  • Wheel Size: 700C
  • Tire: MAXXIS PURSUER 700X32C
  • Rim: F: ALLOY DOUBLE WALL FV H: 20 622 32H TLR / R: ALLOY DOUBLE WALL FV H: 20 622 32H TLR
  • Hub: F: NOVATEC D791SB 12x100mm 32H CL / R: NOVATEC D792SB 12x142mm 32H CL FOR SPROCKET
  • Spokes: F: STAINLESS 14G NDS:290 & DS:292 W/ NIPPLE BRASS / R: STAINLESS 14G NDS:292 & DS290: W/ NIPPLE BRASS

Brake

  • Brake Lever: SHIMANO ST-RX600
  • Brake Caliper: SHIMANO GRX HYDRAULIC DISC
  • Rotor: SHIMANO RT-CL700, 160mm
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) 74.75 74.26 73.76 73.26
Effective Seat Tube Angle (C) 74.75 74.26 73.76 73.26
Head Tube Length (D) 143 163 193 221
Head Tube Angle (E) 70.25 71.77 72.06 72.26
Effective Top Tube (F) 526 550 581 610
Bb Height (G) 265 265 265 265
Bb Offset (H) 79 79 79 79
Chainstay Length (I) 415 415 415 415
Wheelbase (J) 997 1003 1026 1048
Frame Reach (K) 371 383 400 415
Frame Stack (L) 566 591 621 648
Standover Height (M) 701 741 784 819
Product Variants SKU/UPC
  • 2026 Polygon Tambora A4: Charcoal Blue / SM: SKU: 503328001 - UPC:
  • 2026 Polygon Tambora A4: Charcoal Blue / MD: SKU: 503328002 - UPC:
  • 2026 Polygon Tambora A4: Charcoal Blue / LG: SKU: 503328003 - UPC:
  • 2026 Polygon Tambora A4: Charcoal Blue / XL: SKU: 503328004 - UPC: