2021 Polygon Siskiu T8 Dual Suspension Mountain Bike

SKU: 315e95da0161 Category:

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Light & durable Hydroformed 6061 Aluminum frame features tapered head tube, rear boost thru-axle, 73mm bottom bracket, internal cable routing and optimized anti-squat kinematic with progressive suspension ratio.


The Siskiu T handles the demands of a modern trail bike, striking the balance between high speed control and playful handling. Siskiu T models utilize slack head tube combined with short offset forks, longer frame reach and steep seat tube, improving stability and confidence at speed and on steeper terrain.


The FAUX BAR linkage is built around the One Piece Unibody Pivot Bridge that reduces the frame’s weight but also improves stiffness and reduces lateral flex. The pedalling performance is improved due to increased anti-squat and the suspension is now more active thanks to a custom shock tune. The leverage curve provides a high level of progression while maintain sensitivity for small bump compliance.


Boost is the standard wheel and drivetrain specification that opens the opportunity for improved frame geometry with shorter chainstays, wider and stiffer suspension pivots, wider range of chainring options, as well as more clearance for bigger tires and wider, stiffer wheels.


34 is the ultimate trail companion. Featuring an EVOL air spring, GRIP damper, and a lightweight yet robust chassis, you can count on 34 to get up and down the mountain, every time.
Exceptional bump compliance meets exceptional efficiency. The Float DPS’ lightweight chassis, EVOL air spring, and dual piston damper with 3-position switch help conserve energy for when you need it most.
SLX is ready to go wherever and whenever you want, whether it’s an all-day epic or local trail shredding with your buddies. It won’t let you down.
High power and controllable braking system features front & rear 4 piston caliber.




The Polygon Siskiu T delivers the ultimate value for money trail bike that modern riders have been waiting for. The latest evolution of the Siskiu Trail series opens any trail to any rider through encompassing progressive geometry into an attainable package. From all-day epics to hot laps of your local loop, the Siskiu T delivers confident yet lively handling on everything from punchy climbs to rowdy descents as you push the limits of traction.

Designed around Polygon’s Wheel Fit Size System, the Siskiu T features 29′ wheels on LG & XL frame sizes, MD size offers the choice of 29′ or 27.5′ and the SM size is exclusively optimized around the agility of 27.5′. The frame is designed to ensure a water bottle can be nestled well in the frame, meaning longer rides; Heck yeah!

The Siskiu T handles the demands of a modern trail bike, striking a balance between high-speed control and playful handling. Progressive geometry was vital to achieving this. The reach was lengthened 25-30mm on all sizes, and the trail has also been increased by a 1′ slacker head angle combined with short offset forks, improving stability and confidence at speed and on steeper terrain. The benefits of a steep seat angle can’t be understated, which is why the effective seat angle has been increased significantly to 76.5′ while the chainstay length has been shortened by 5mm to maintain agility. On the trail, the Siskiu T feels just as responsive and agile as the previous generation, but the overall ceiling of what the bike is capable of has been lifted.

The suspension is optimized around each wheel size; 29′ models feature 135mm of rear travel with 140mm forks while 27.5′ bikes have 140mm in the rear with 150mm up front. Polygon’s proven FAUX BAR suspension linkage featuring a One Piece Unibody Pivot Bridge reduces the frame’s weight while improving stiffness and reducing lateral flex on the rear shock under load. The bike’s kinematics maintain the poppy supportive nature of the previous generation while enhancing the climbing efficiency and small bump compliance. The pedaling platform is efficient thanks to the 10% increase in anti-squat, which has allowed a lighter custom tune on the shock to improve small bump compliance and enable the suspension to move more freely.

Seat tubes have been significantly shortened to allow for generous dropper post lengths, 150mm on SM and MD frames, and 170mm on LG and XL. The frame also features a hassle-free threaded bottom bracket, Boost axles for stiff and reliable wheels, and internal cable routing through the mainframe keeping the bike looking sleek.

Like the frame, the Siskiu T8’s component selection takes your trail time to a whole new level. Fox 34 Rhythm and Float DPS suspension, Tektro 4-piston disc brakes, and Entity Expert 35mm clamp cockpit provide the control you demand. The 12-speed SLX drivetrain is Shimano’s reliable workhorse delivering power to the trail through Shimano Boost hubs, tubeless-ready Entity XL2 35mm internal width rims, and 2.6′ tubeless-ready rubber. Upgrade from riding with tubes by simply adding tubeless tape, valves, and sealant to take your riding to the next level.

Here it is! The Siskiu T8 is your fun-filled machine that’s ready for everything you point at’ Any Trail, Any Rider. The trails are calling!


Model Comparison Chart

2021 Siskiu T7 2021 Siskiu T8
Frame ALX Trail 6061 Aluminum Frame, 140mm (27.5″) / 135mm (29″) Travel, Internal Routed Gear & Dropper Cables, Tapered Headtube, 73mm Threaded Boost BB, 148x12mm Boost Thru-Axle, ISCG05 Mount ALX Trail 6061 Aluminum Frame, 140mm (27.5″) / 135mm (29″) Travel, Internal Routed Gear & Dropper Cables, Tapered Headtube, 73mm Threaded Boost BB, 148x12mm Boost Thru-Axle, ISCG05 Mount
Fork Rockshox Recon Silver-RL 150mm (27.5″) / 140mm (29″) Travel, Solo Air, Boost 15x110mm Axle Fox 34 Rhythm, 150mm (27.5″) / 140mm (29″) Travel, Grip Damper, Boost 15x110mm Axle
Rear Shock Rockshox Deluxe Select Plus, Debon Air, Rebound, 2-Position Compression, Custom Tune Fox Float DPS, Evol LV Air Spring, Rebound Adjuster, 3-Position Lever, Custom Tune
Crankset Shimano MT-510-1 Boost 32T, 170mm (S, M) / 175mm (L, XL) Shimano MT-510-1 Boost 32T, 170mm (S, M) / 175mm (L, XL)
Drivetrain Shimano Deore M6100 1X12 Speed Shimano SLX M7100 1X12 Speed
Brakes Tektro HD-M735, Caliper F/R: 4-Piston/2-Piston Tektro HD-M745, Caliper F/R: 4-Piston
Tire WTB Trail Boss G2 27.5×2.4″ / 29×2.4″, TCS Aramid Bead, Slash Guard Sidewall Protection, Tubeless Ready Schwalbe Hans Dampf Evo 27.5×2.60″ / 29×2.60″, ADDIX SpeedGrip, Snakeskin, Tubeless Ready
Rim Entity XL2 Disc 35-584 (27.5″) / 35-622 (29″), 35mm Inner Width, Tubeless-ready* Entity XL2 Disc 35-584 (27.5″) / 35-622 (29″) , 35mm Inner Width, Tubeless-ready*
Weight 33.8lbs 33.5lbs


How the Bike is Delivered to You

Your bike will arrive in a custom Bikes Online bike guard box as described in the video below.

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