Bicycle Archive · Specification report

2021 Polygon Syncline C3

Velopedia Archive ID 900001791

Overview

Model year	2021
Brand	Polygon
Model	SYNCLINE C3
Bicycle type	Mountain
Archive ID	900001791
Original MSRP	$1,249.00
Colors	Brown Charcoal
Sizes	27.5” SM; 27.5” MD; 29” MD; 29” LG; 29” XL

Frameset

Frame construction	ACX XC Performance
Frame material	Carbon Fiber
Fork	RockShox Recon Silver RL, 120mm
Rear shock	-

Drivetrain

Shifters	Shimano Deore SL-M6100-R 12-speed Trigger
Rear derailleur	Shimano Deore RD-M6100-SGS Direct Attach
Crankset	Shimano FC-MT510-1 32T 2-Piece-Crank
Bottom bracket	Shimano BB-MT500-PA
Cassette	12 Speed 11-51T
Chain	KMC New X-12
Pedals	Alloy Cage Pedal W/ Reflector

Brakes

Brakes	Shimano BR-MT201; Levers: Shimano BL-MT201; Rotors: Shimano SM-RT10 F:180mm R:160mm Centerl Lock

Cockpit & contact points

Headset	Integrated W/ Sealed Bearing for Taper Head Tube, IS 42/28.6 \| IS 52/40
Handlebar	ENTITY XPERT, W: 740mm, BB: 31.8mm, R/D: 12mm, B: 9degree
Stem	Integrated W/ Sealed Bearing for Taper Head Tube, IS 42/28.6 \| IS 52/40
Saddle	Entity Void Saddle
Seatpost	Entity Xpert, 27.2X350mm

Wheels & tires

Hubs	F: Shimano HB-MT400-B 15x110mm 32H Center Lock / R: Shimano FH-MT510-B 12x142mm 32H Center Lock
Wheels	Alloy Double Wall
Rims	584-30 / 622-30 32H for Tyre 584 / 622-54/76 Tubeless Ready
Front tire	WTB Trail Boss Tire, 27.5X2.25 / 29x2.25
Rear tire	WTB Trail Boss Tire, 27.5X2.25 / 29x2.25

Geometry · S (27.5”)

Seat tube	380 mm
Effective top tube	569 mm
Head tube	100 mm
Head-tube angle	67°
Seat-tube angle	75.3°
Actual seat-tube angle	73°
Chainstay / rear center	425 mm
Wheelbase	1106.94 mm
Bottom-bracket drop	45 mm
Bottom-bracket height	308.5 mm
Reach	410 mm
Stack	596.6 mm
Standover height	690.9 mm

Geometry · M (27.5”)

Seat tube	420 mm
Effective top tube	594.6 mm
Head tube	120 mm
Head-tube angle	67°
Seat-tube angle	75.3°
Actual seat-tube angle	73°
Chainstay / rear center	425 mm
Wheelbase	1134.8 mm
Bottom-bracket drop	45 mm
Bottom-bracket height	308.5 mm
Reach	430 mm
Stack	615 mm
Standover height	729.2 mm

Geometry · M (29”)

Seat tube	420 mm
Effective top tube	597.7 mm
Head tube	100 mm
Head-tube angle	67°
Seat-tube angle	75.3°
Actual seat-tube angle	73°
Chainstay / rear center	435 mm
Wheelbase	1149.5 mm
Bottom-bracket drop	64 mm
Bottom-bracket height	307.5 mm
Reach	430 mm
Stack	633.2 mm
Standover height	730.8 mm

Geometry · L (29”)

Seat tube	460 mm
Effective top tube	621 mm
Head tube	120 mm
Head-tube angle	67°
Seat-tube angle	75.3°
Actual seat-tube angle	73°
Chainstay / rear center	435 mm
Wheelbase	1176.9 mm
Bottom-bracket drop	65 mm
Bottom-bracket height	307.5 mm
Reach	450 mm
Stack	651.6 mm
Standover height	763.7 mm

Geometry · XL (29”)

Seat tube	500 mm
Effective top tube	649.15 mm
Head tube	140 mm
Head-tube angle	67°
Seat-tube angle	75.3°
Actual seat-tube angle	73°
Chainstay / rear center	435 mm
Wheelbase	1204.76 mm
Bottom-bracket drop	65 mm
Bottom-bracket height	307.5 mm
Reach	470 mm
Stack	670 mm
Standover height	779.2 mm

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