2021 Polygon Siskiu D7 – Dual Suspension Mountain Bike

SKU: e4414315e560 Category:

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


Using the most of the modern features, Siskiu D models utilize slack head tube and steep seat tube angle to ensure that the bike handles perfectly and travels effortessly up and down the mountain.


With optimized material concentrated at the brace and seal area, outstanding stiffness and steering precision, Recon Silver is an all-around performer suited for any singletrack.


New Maxima Plush damping fluid reduces friction and silences damper noise and highly tunable DebonAir spring offers a coil-like consistent feel throughout the travel with separate and independent open and threshold pistons tuned exactly for your ride.


Deliver a new level of premium performance to the value category by bringing hallmark elite mountain bike technologies that maximizes versatility and value.


Proven, bombproof design with reliable braking performance.


The all-rounder that works in every situation, no matter the weather, no matter the terrain.



Compare the 2020 Polygon Siskiu D7 – Dropper Post Edition with similar bikes:

2021 Polygon Siskiu D7 – Dropper Post Edition

2020 Polygon Siskiu D7 - Dropper Post Edition


Fuel EX7


Specialized Stump Jumer ST


Co-op Cycles DRT 3.1 Bike Framr 4.7 AL


YT Jeffsy AL Base


Sourced on: 07/01/2020

Disclaimer: The price for the bikes above was sourced from the official brand website price on the date above mentioned. Bikes Online is not responsible for any price changes.


Industry Reviews



If you liked the 2020 Polygon D7, then you’ll LOVE the 2021 Polygon D7! Upgrades include a full Shimano Deore Drivetrain and a Rockshox rear air shock.


The new 2021 Polygon Siskiu D7 has become one of the most popular and highest selling dual-suspension bikes for Polygon. Capitalizing on extensive R & D, state of the art testing facilities, and feedback from top-level riders, the Polygon Sikiu D7 defies what an outstanding value dual-suspension mountain bike is capable of. This year’s host of upgrades tick all the boxes for those looking for a bike with modern geometry, great XC pedaling efficiency, and all-mountain capability.


The D7 is built around a lightweight, ALX aluminum boost frame that boasts a modern rider’s modern geometry. The bike now has a slacker head tube angle, more extended reach, lower BB, and shorter chain-stay to boost your performance in climbing or to descend, no matter the distance, technicality, or gradient. Polygon has also revised kinematics on the Siskiu D. The anti-squat has been optimized, and the suspension is more progressive. It has 120mm of travel in the rear, with a one-piece linkage system that reduces lateral flex in the rear triangle and improves the linear movement and performance of the shock. The frame now also comes with room for a water bottle mount.


Perhaps the most significant upgrade to the Siskiu D7 frame is the integration of Polygon’s new Wheel Fit Size System. Each frame size is paired with the wheel size that best fits the rider and sets them up for optimal efficiency and power transfer. We match 29er wheels with 18.5″ and larger bikes, and more proportional, better-fitting 27.5-inch wheels for 17.5″ and smaller bikes. Additional to this is a Tranz X JD-YSP23JL, 459mm with a dropper post 150mm (S-M) / 170mm (L-XL) Travel, Remote Lever, making this bike exceptionally more capable and comfortable when descending.


An upgraded full Shimano 1 x 11 drivetrain powers the D7 with a Shimano Deore rear derailleur with a clutch and a massive 51T rear cassette providing plenty of range to glide up those steep climbs. The Shimano Deore Crankset allows for quality and power while continuing the clean looks of the bike.


Dampening duties on the D7 are provided by a RockShox Recon Silver RL front air fork, which now comes with beefier chassis and stout 32mm Fast Black steel upper tubes. This is combined with a dependable RockShox Deluxe Select Plus air shock on the rear, offering the compliance and smooth-riding you’ve come to love from Rockshox. The bike rolls on a pair of wide 29mm rim Entity X15 double-wall wheels and Schwalbe Nobby Nic Performance 2.25″ tires, giving you loads of traction for climbs and hitting the berms.


If you’re looking for a bike to do it all with killer style and a dependable, high quality, trail-ready components list, then the Siskiu D7 is the bike for you!


Model Comparison Chart

  2021 Siskiu D5 2021 Siskiu D7
Frame ALX XC Trail 6061 Aluminum Frame, 120mm Travel, Internal Routed Gear Cables, Taper Headtube, QR Boost, Internal Routed Dropper Post Compatible ALX XC Trail 6061 Aluminum Frame, 120mm Travel, Internal Routed Gear & Dropper Cables, Tapered Headtube, 73mm Threaded Boost BB, 148x12mm Boost Thru- Axle
Fork SR Suntour XCM HLO, 120mm Travel, Preload Adjuster, Hydraulic Lockout Rockshox Recon RL, Solo Air, 120mm Travel (27.5″ & 29″), Rebound & Compression Adjuster, 46mm (27.5″) & 51mm (29″) Offset, Maxle Stealth Axle 100x15mm
Rear Shock SR Suntour Raidon- LO AIR, E2E: 190X51mm, Hardware: M8x22mm Rockshox Deluxe Select Plus, DebonAir, Rebound & Compression Adjuster, E2E 190x45mm, M8x25mm Hardware
Headset Polygon Internal Caged Bearings, ZS 44/28.6 | ZS 56/40 Threadless Zero Stack Headset, ZS 44/28.6 | ZS 56/40
Crankset Shimano Altus FC-MT2102 36x22T Boost, 170mm Shimano Deore FC-M5100 Boost 32T, Crank Length: 170mm (S, M) / 175mm (L, XL)
Drivetrain Shimano Alivio M3000 2X9 Speed Shimano Deore M5100 1X11 Speed Wide-range
Bottom Bracket Shimano BSA Threaded, 73mm BSA Threaded 73mm
Brakes Shimano BR-M201 Hydraulic Disc, Rotor F: 180mm R: 160mm Shimano BR-M201 Hydraulic, Rotor F/R: 180/160mm
Tire Entity Spiderbait 27.5×2.25″ Schwalbe Nobby Nic Performance 27.5/29×2.25″, Tubeless ready*
Rim Doublewall Alloy 24mm Internal Width Entity X15 Doublewall Disc 32H, 30mm Internal Width, Tubeless Ready*
Spokes Stainless Steel Spokes Stainless Steel Spokes, *tubeless tape and valve sold separately
Price $1,099 $1,699


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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