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Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
Polygon Siskiu D7 - Mountain Bike
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Description

YOUR RIDE, YOR RULES

The perfect full-suspension mountain bike for riders of all levels. Whether you're new to the sport or seeking a playful and efficient bike, the Siskiu D delivers. With 120mm off travel, a durable frame, and modern geometry, it effortlessly handles everything from cross-country loops to flowy descents, providing a confident and enjoyable ride for all.

VALUE MEETS PERFORMANCE

The Siskiu D is designed to conquer climbs with its wide-range 1x drivetrain and efficient pedaling platform. It's also equipped with a dropper post for added maneuverability on the descents, giving you confidence on the descents. With quality air suspension and modern geometry, the Siskiu D delivers a capable and affordable ride.

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

“An affordable entry-level full-suspension bike for taking your riding to the next level” - Outdoor Gear Lab

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.

ROCKSHOX RECON FORK

One of the most underrated performers in the RockShox range. It packs a massive punch with its air spring design, 120mm travel, adjustable rebound, and compression dials for fine-tuning.

ROCKSHOX DELUXE SELECT+ SHOCK

The DebonAir air spring offers easy air adjustment to match rider weight and riding style and impressive suppleness. It features external rebound and compression adjustment for on-the-fly fine-tuning, and the ability to tune progression with volume spacers.

DROPPER POST

Featuring 150mm of drop for smaller frames and 170mm for larger frames, a dropper post allows riders to quickly lower their saddle for improved maneuverability and control on descents.

SHIMANO DEORE 1X11 DRIVETRAIN

Boasting a massive 11-51T cassette, rivalling the range of many 1x12 systems. Enjoy the simplicity and reduced weight of a 1x setup, plus smoother shifting and improved chain retention compared to traditional 2x drivetrains.

Components

FRAMESET
FRAME
ALX XC Trail 6061 Alloy Frame, 120mm Travel, Internal Routed Gear & Dropper Cables, Tapered Headtube, 73mm Threaded Boost BB, 148x12mm Boost Thru-Axle
SUSPENSION
FORK
Rockshox Recon Silver RL, Solo Air, 120mm Travel (27.5" & 29"), Rebound & Compression Adjuster, 46mm (27.5") & 51mm (29") Offset, Maxle Stealth Axle 100x15mm
SHOCK
Rockshox Deluxe Select Plus, DebonAir, Rebound & Compression Adjuster, E2E 190x45mm, M8x25mm Hardware
DRIVETRAIN
REAR DERAILLEUR
Shimano Deore RD-M5100 11-Speed
SHIFTER
Shimano Deore SL-M5100 1x11-Speed Trigger
CRANK
Shimano Deore FC-M5100 Boost, Crank Length: 170mm (S, M) / 175mm (L, XL)
CHAINRING
32T
CASSETTE
Shimano Deore CS-M5100 11-51T 11-Speed
CHAIN
KMC X11-1 11-Speed
BRAKES
FRONT BRAKE
Shimano BR-M201 Hydraulic, 180mm Rotor
REAR BRAKE
Shimano BR-M201 Hydraulic, 160mm Rotor
WHEELS
REAR HUB
Solon DH943TR,Thru Axle, 12x148mm, 32H Centerlock
RIM
Entity X15 Doublewall Disc 32H, 29mm Internal Width, Tubeless Ready
TYRE
Schwalbe Nobby Nic Performance Wire Bead 27.5/29x2.25"
CONTACT POINTS
HANDLEBAR
Entity Expert, Alloy, 780mm
GRIPS
Entity
SADDLE
Entity Void Saddle
SEATPOST
TranzX Dropper Post, S-M (27.5"): 150mm Travel, M-XL (29"): 170mm Travel, Zero Offset, 30.9mm, Remote Lever
STEM
Entity Expert, Alloy 45mm
WEIGHT
BIKE WEIGHT
34.6lbs (Size L)

Specs are subject to change based on availability.

Geometry

  S M M L XL
Height (cm) 5'1–5'6 5'6–5'10 5'7–5'11 5'11–6'2 6'2–6'5
(A) Stack 571 580 607 616 625
(B) Reach 425 445 445 465 485
(C) Head Tube Angle 67° 67° 67° 67° 67°
(D) Head Tube Length 102 105 102 112 122
(E) Seat Tube Angle 70° 70° 68° 68° 68°
Seat Tube Angle Effective 75° 75° 76° 76° 76°
(F) Seat Tube Length 395 435 435 487 522
(G) Top Tube Effective 572 595 603 624 646
(H) Bottom Bracket Height 326 326 326 326 326
(I) Bottom Bracket Offset 27 27 47 47 47
(J) Chainstay 432 432 436 436 436
(K) Wheel Base 1133 1157 1165 1189 1213
(L) Standover Height 676 696 698 733 761
Handle Bar Width 760 760 760 760 760
Stem Length 45 45 45 45 45
Crank Length 170 170 170 170 170
Front Travel 120 120 120 120 120
Rear Travel 120 120 120 120 120
Dropper Travel 150 150 170 170 170
Maximum Tyre size 27.5"x2.25" / 29"x2.25"
Maximum Chainring Size Single 38T, Double 36/24T

* 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

How to Unbox Your Polygon Siskiu D7

Step 2

How To Setup Your Suspension

Step 3

Dial In Your Bike Fit

Step 4

Dial In Your Tyre Pressures

Step 5

Pre-Ride Check

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Customer Reviews
4.7 Based on 1,089 Reviews
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RJ
05/28/2025
Russell J.
United States United States

Bikes Online Polygon Siskiu D7

Delivery was reasonably quick, 5 days from purchase. The box and contents arrived undamaged. Assembly was simple. The recommended size (70", size L) fits me well, although the 170mm dropper is a bit too much. Easy swap, though. Great experience.

BikesOnline US Polygon Siskiu D7 - Mountain Bike Review
Polygon Siskiu D7 - Mountain Bike
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05/23/2025
Abdullah A.
United States United States

Amazing first serious Mountain Bike!

Heard about Polygon from one of my colleagues. I was a little skeptical about online only shop; was concerned about fit and quality. I was happily proven wrong. Buying from bikesonline was a breeze. Bike was delivered earlier than expected. Installation was straight forward with included tools. I have the bike for a week now. I live next to a trail system. Since I got the bike, I took it for a ride everyday and tried it on easy/green and intermediate/blue colored trails. It has been an amazing experience so far. The dual suspension works like a charm; and I never thought that I would use the dropper post as much. This is my first mountain bike and I am absolutely a newbie. Siskiu D7 is making my learning a pleasant and memorable experience. My town, Austin, TX, has plenty of trail systems and I am looking forward to exploring most of them in the days to come. Thanks polygon for making such a well built bike and kudos to bikesonline.com for making the purchase, delivery, and installation process so easy!

Polygon Siskiu D7 - Mountain Bike
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