Bicycle Archive · Specification report

2023 Polygon Tambora G8X

Velopedia Archive ID 900001855

Overview

Model year	2023
Brand	Polygon
Model	TAMBORA G8X
Bicycle type	Cyclocross/Gravel
Archive ID	900001855
Original MSRP	$2,999.00
Colors	Brown
Sizes	S; M; L; XL

Frameset

Frame construction	ACX Gravel
Frame material	Carbon Fiber
Fork	Carbon Rigid
Fork material	Carbon Fiber

Drivetrain

Shifters	SRAM Rival eTap AXS 12-speed Brifter
Rear derailleur	SRAM Rival Xplr eTap AXS 12-speed
Crankset	SRAM Rival 1 Wide 40T
Bottom bracket	SRAM DUB T47
Cassette	SRAM XG-1251 12 Speed 10-44T XDR
Chain	SRAM Rival 12-speed

Brakes

Brakes	SRAM Rival Hydraulic Disc; Levers: SRAM Rival; Rotors: SRAM Paceline 160mm CL

Cockpit & contact points

Headset	Token TK155SP-36 W/ Sealed Bearing
Handlebar	ALLOY FLARE 16degree, W: 420mm (S, M) / 440mm (L, XL), BB: 31,8mm, R/D: 125mm, B/R: 77mm
Stem	ALLOY STEM, EXT: 90mm (S, M) / 100mm (L, XL), BB: 31,8mm, R/D: 7degree
Saddle	Selle Italia Model X
Seatpost	Carbon, DXL: 27,.2 X 300mm (S,M,L) / 27.2 X 350mm (XL)

Wheels & tires

Hubs	F: Novatec D791 12x100mm 24H CL / R: Novatec D792 12x142mm 24H CL for XDR
Wheels	Novatec G24 Disc (28mm) W/ Tubeless Tape Installed
Rims	Carbon FV H: 28 622x24 24H for Tyre 622-35/68 TLR
Front tire	700x40C 622x40 TLR
Rear tire	700x40C 622x40 TLR

Geometry · S · Speed Gravel

Seat tube	404 mm
Effective top tube	526 mm
Head tube	143 mm
Head-tube angle	70°
Seat-tube angle	74.5°
Actual seat-tube angle	74.5°
Chainstay / rear center	425 mm
Wheelbase	1017 mm
Bottom-bracket drop	78 mm
Bottom-bracket height	280 mm
Reach	369 mm
Stack	568 mm
Standover height	716 mm

Geometry · M · Speed Gravel

Seat tube	448 mm
Effective top tube	551 mm
Head tube	163 mm
Head-tube angle	71.5°
Seat-tube angle	74°
Actual seat-tube angle	74°
Chainstay / rear center	425 mm
Wheelbase	1022 mm
Bottom-bracket drop	78 mm
Bottom-bracket height	280 mm
Reach	381 mm
Stack	593 mm
Standover height	755 mm

Geometry · L · Speed Gravel

Seat tube	492 mm
Effective top tube	581 mm
Head tube	193 mm
Head-tube angle	71.8°
Seat-tube angle	73.5°
Actual seat-tube angle	73.5°
Chainstay / rear center	425 mm
Wheelbase	1045 mm
Bottom-bracket drop	78 mm
Bottom-bracket height	280 mm
Reach	397 mm
Stack	622 mm
Standover height	798 mm

Geometry · XL · Speed Gravel

Seat tube	535 mm
Effective top tube	611 mm
Head tube	221 mm
Head-tube angle	72°
Seat-tube angle	73°
Actual seat-tube angle	73°
Chainstay / rear center	425 mm
Wheelbase	1067 mm
Bottom-bracket drop	78 mm
Bottom-bracket height	280 mm
Reach	412 mm
Stack	650 mm
Standover height	833 mm

Geometry · S · All Road

Seat tube	404 mm
Effective top tube	526 mm
Head tube	143 mm
Head-tube angle	70.25°
Seat-tube angle	74.75°
Actual seat-tube angle	74.75°
Chainstay / rear center	415 mm
Wheelbase	997 mm
Bottom-bracket drop	79 mm
Bottom-bracket height	265 mm
Reach	371 mm
Stack	566 mm
Standover height	701 mm

Geometry · M · All Road

Seat tube	448 mm
Effective top tube	550 mm
Head tube	163 mm
Head-tube angle	71.77°
Seat-tube angle	74.26°
Actual seat-tube angle	74.26°
Chainstay / rear center	415 mm
Wheelbase	1003 mm
Bottom-bracket drop	79 mm
Bottom-bracket height	265 mm
Reach	383 mm
Stack	591 mm
Standover height	741 mm

Geometry · L · All Road

Seat tube	492 mm
Effective top tube	581 mm
Head tube	193 mm
Head-tube angle	72.06°
Seat-tube angle	73.76°
Actual seat-tube angle	73.76°
Chainstay / rear center	415 mm
Wheelbase	1026 mm
Bottom-bracket drop	79 mm
Bottom-bracket height	265 mm
Reach	400 mm
Stack	621 mm
Standover height	784 mm

Geometry · XL · All Road

Seat tube	535 mm
Effective top tube	610 mm
Head tube	221 mm
Head-tube angle	72.26°
Seat-tube angle	73.26°
Actual seat-tube angle	73.26°
Chainstay / rear center	415 mm
Wheelbase	1048 mm
Bottom-bracket drop	79 mm
Bottom-bracket height	265 mm
Reach	415 mm
Stack	648 mm
Standover height	819 mm

Manufacturer-published archive data. Confirm exact standards and dimensions before ordering parts or performing service. Generated by Velopedia on September 13, 2026.