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Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
Polygon Siskiu T8 - Mountain Bike
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Description

ANY TRAIL, ANY RIDER!

The Siskiu T is Polygon's do-it-all trail bike for riders of all levels. From flowy singletrack to technical features, this bike is designed to conquer any trail you encounter. With a lightweight alloy frame, 135/140mm of rear travel, and size-specific wheel sizes, it's both nimble and stable, providing a comfortable and confidence-inspiring ride.

ULTIMATE VALUE

Don't let the price fool you - the Siskiu T delivers high-performance features typically found on more expensive bikes. Modern geometry, quality air suspension, a 1x drivetrain, and a dropper post give you the tools to climb with ease and attack the descents. Experience the thrill of modern trail riding without breaking the bank.

A TRUSTED BRAND

Polygon is a factory-direct brand with over 30 years of experience crafting high-performance bikes at competitive prices. Vertically integrated manufacturing ensures quality and cost savings. Their mountain bikes have been tested on the world stage at events like Redbull Rampage and the World Cup circuit, boasting a 5-year frame warranty for peace of mind.

INDUSTRY REVIEWS

"The bike is a solid value, looks so good and is more than capable to be ridden at a very high level.” - Loam Wolf

FOX 34 RHYTHM FORK

Experience 150/140mm of air-sprung travel for a smooth and controlled ride. Its Grip damper and adjustable rebound provide a responsive feel on the trail. Add or remove volume spacers to fine-tune bottom-out resistance.

FOX FLOAT DPS SHOCK

The Fox Float DPS Performance Series EVOL LV offers a 2-position lever for quick Open and Lock adjustments. With its EVOL air spring, rebound adjuster, and volume spacers, it delivers enhanced tuning and fine-tuned progression for optimal ride quality.

ONE-PIECE LINK

Sometimes simple is better! The linkage-actuated single pivot offers active and progressive suspension making for a supple ride on technical sections and a playful ride on flow trails, while the one-piece pivot bridge reduces flex and saves weight.

SHIMANO SLX 1X12 DRIVETRAIN

The 12-speed drivetrain is paired with a Sunrace 11-51T cassette, giving you a +500% gear ratio and features Shadow+ technology.

WHEELSIZE FIT

The perfect fit for all riders. Smaller sizes come in 27.5" for nimble handling and a lower standover. Medium riders can choose between 27.5" or 29" wheels, while larger sizes get the added stability and rollover of 29" wheels.

Components

FRAMESET
FRAME
ALX Trail 6061 Aluminium Frame, One Piece Unibody Pivot Bridge 140/135mm Travel (29"), Dropper Post and Rear Derailleur Routing, Direct Post-Mount Disc Brake, 148x12mm Boost Thru-Axle, Threaded BB, ISCG 05 Tabs
SUSPENSION
FORK
Fox 34 Rhythm, Grip Damper, Rebound & Sweep Adjust, 150/140mm Travel (29"), 110x15mm Kabolt Boost Axle
SHOCK
Fox Float DPS Performance Series EVOL LV, 2-Position, 210x55mm
DRIVETRAIN
REAR DERAILLEUR
Shimano SLX RD-M7100, 12-Speed
SHIFTER
Shimano SLX SL-M7100, 12-Speed
CRANK
Shimano FC-MT-510-1
CHAINRING
32T
CASSETTE
Sunrace CSMZ-800, 11-51T, 12-Speed
CHAIN
KMC X-12
BRAKES
FRONT BRAKE
Shimano BR-MT420 4-Piston Caliper, 180mm Rotor* / Tektro HD-M745, 4-Piston Caliper, 180mm Rotor*
REAR BRAKE
Shimano BR-MT420 4-Piston Caliper, 180mm Rotor* / Tektro HD-M745, 4-Piston Caliper, 180mm Rotor*
WHEELS
REAR HUB
Novatec D442SB, 12x148mm, HG Freehub, 32h, Center Lock*
RIM
Entity XL2 Disc (29”), 35mm Inner, Tubeless Ready
TYRE
VeeTire Flow Snap, Tackle Compound | Schwalbe Hans Dampf ADDIX Speed Grip, 29x2.6", Tubeless Ready
CONTACT POINTS
HANDLEBAR
Entity Xpert, Alloy, 780mm wide, 35mm Diameter
GRIPS
Polygon Lock On
SADDLE
Entity
SEATPOST
KS RAGE-I, Size S-M 150mm Travel, Size L-XL 170mm Travel, Zero Offset, 30.9mm Polygon Seat Clamp
STEM
Entity Xpert, Alloy, 35mm length, 35mm Clamping Diameter
PEDALS
Alloy Flat Pedal w/Replaceable Pin and Reflector
WEIGHT
BIKE WEIGHT
33.5 lbs (Size M 29)

*Specs are subject to change based on availability

Geometry

Frame Size S
(27.5")		 S
(29")		 M
(27.5")		 M
(29")		 L
(29")		 XL
(29")
Height (cm) 5'2"-5'6" 5'2"-5'6" 5'6"-5'10" 5'6"-5'10" 5'10"-6'1" 6'1"-6'5"
(A) Frame stack 593.5 594.0 607.1 607.6 621.2 634.9
(B) Frame reach 440 440 460 460 480 500
(C) Head tube angle 65° 65.5° 65° 65.5° 65.5° 65.5°
(D) Head tube length 105 90 120 90 105 120
(E) Seat tube angle 71° 70.5° 71° 70.5° 70.5° 70.5°
Effective seat tube angle 76.5° 76.5° 76.5° 76.5° 76.5° 76.5°
(F) Seat tube length 385 385 400 400 415 430
(G) Effective top tube 582.5 583.0 605 605.9 629.1 652.4
(H) BB Height 335 335 335 335 335 335
(I) BB offset 20 (Drop) 39 (Drop) 20 (Drop) 39 (Drop) 39 (Drop) 39 (Drop)
(J) Chainstay length 425 430 425 430 430 430
(K) Wheelbase 1172.8 1173.5 1199.1 1193.5 1219.7 1245.9
(L) Standover height 690 695 695 700 710 720
Front Travel 150 140 150 140 140 140
Rear Travel 140 135 140 135 135 135
Dropper Post Travel 150 150 150 150 170 170
Maximum Tyre Width   2.6"   2.6"    
Maximum Chainring Size   36T   36T    


* All lengths in mm

Assembly

Your bike needs minor assembly before riding; use the tools and videos included.

As a guide, it'll take 10-40min depending on whether you're an experienced bike assembler or have little to no mechanical experience.

Side Note: Your cables will stretch during the initial bed-in period and must be adjusted by an experienced mechanic around 150km of riding.

Step 1

Unboxing Your Bike

Step 2

Dial In Your Suspension Setup

Step 3

Dial In Your Bike Fit

Step 4

Dial In Your Tyre Pressures

Step 5

Pre-Ride Check

Compare this bike

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  • Description
    The Polygon Siskiu T8 is the ultimate all-mountain shredder, boasting 135/140mm of travel, a playful trail geometry, and a capable Fox Float DPS/34 Rhythm suspension combo. Shimano's SLX 12-speed drivetrain and 4-piston brakes deliver reliable performance for conquering any trail.
  • FRAMESET
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    ALX Trail 6061 Aluminium Frame, One Piece Unibody Pivot Bridge 140/135mm Travel (29"), Dropper Post and Rear Derailleur Routing, Direct Post-Mount Disc Brake, 148x12mm Boost Thru-Axle, Threaded BB, ISCG 05 Tabs
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    N/A
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    Fox 34 Rhythm, Grip Damper, Rebound & Sweep Adjust, 150/140mm Travel (29"), 110x15mm Kabolt Boost Axle
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    shifter
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Polygon Siskiu T8 - Mountain Bike
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$1,899.99
  • Description
    The Polygon Siskiu T8 is the ultimate all-mountain shredder, boasting 135/140mm of travel, a playful trail geometry, and a capable Fox Float DPS/34 Rhythm suspension combo. Shimano's SLX 12-speed drivetrain and 4-piston brakes deliver reliable performance for conquering any trail.
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    rear derailleur
    Shimano SLX RD-M7100, 12-Speed
    front derailleur
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    shifter
    Shimano SLX SL-M7100, 12-Speed
    crank
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    cassette
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    front derailleur
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    crank
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    chainring
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    chain
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  • Description
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    frame
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    crank
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    chainring
    N/A
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Customer Reviews
4.8 Based on 962 Reviews
5 ★
84% 
814
4 ★
12% 
112
3 ★
2% 
21
2 ★
1% 
8
1 ★
1% 
14
Customer Photos
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NV
14 Aug 2025
nick v.
United States

Best bang for buck

I’ve tried multiple different bikes including a t7, n9 and other brands and let me tell you… the t8 blows the others out of the water. I have about 100 miles on it and not one hiccup. Highly recommended

Polygon Siskiu T8 - Mountain Bike
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SB
14 Aug 2025
Sawyer B.
United States

Perfect bike that gives you more for less money

This bike is perfect. From trail riding to bombing trails at the bike park. It meets all expectations. The bike came in less than five days and assembling. It was fairly easy even for a 14-year-old. The one thing I will say I am looking to upgrade is the brakes. This bike just gets you up to such high speeds that the brakes that comes stuck on I cannot handle it very well, especially for me. Who only weighs 130. I could not imagine someone. Who is 180+ trying to stop on a fast descent. Overall, a great bike my friend has the same one and my dad is looking to get one too.

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PG
30 Jul 2025
Paul G.
United States

T8

After doing small upgrades, seat, handle bars it's a great bike for me. Love the feel and suspension it came with. I haven't ridden in about 15 years so upgrading my bike was a big deal. I definitely found what I was looking for with the T8 at a good price. Also bikes online was very good. Paul

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JE
30 Jul 2025
Jesse E.
United States

Great Trail Bike

Bike performs very well. Can't beat the price. Bikes Online was easy to work with.

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