2022 Polygon

Siskiu D6 Dual Suspension

A 27.5″ aluminum frame full suspension trail bike with upper mid-range components.
Compare the full range

MSRP$1,499
Weight37.6 lbs  
FrameAluminum
SuspensionFull, 120 / 120mm
ForkSuntour XCR Air
ShockX-Fusion
Wheels27.5″ Aluminum
Drivetrain1 × 10
GroupsetDeore
BrakesHydraulic Disc
SeatpostDropper
Where to Buy
Similar Bikes

For This Bike

Accessories
Top Comparison
Insights
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

26 mph

Siskiu D6 Dual Suspension

26 mph

Similar Bikes

Highest gear

(descending)

Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.

Compare the full Siskiu model range

View Comparison
Reviews
Loam Wolf
2023 Budget Bike Roundup: Polygon Siskiu T8

Feb 2023

The Polygon Siskiu T8 is a 135mm, 29er that outshines it's $2,600 price tag and was a tester favorite during our recent Budget Bike Round Up.

Highs
  • Capability

  • 4 piston brakes

  • Price point

Lows
  • Tektro Brake Levers

  • Requires precise shock settings

Read Review

MBR
Polygon Siskiu T8 29 review - MBR

Jan 2023 · Alan Muldoon

The Polygon Siskiu is a hard hitting 29er trail bike with 135mm of travel and a 140mm fork. Dig a little deeper however, and you quickly discover that this isn’t your typical entry-level full suspension bike that’s been dumbed down for mass production. In fact, it’s one of the best budget mountain bikes out there.  Best mountain bikes: the ultimate trail, enduro and XC bikes Need to know: Fox 34 fork and Float DPS shock deliver 140mm and 135mm of travel respectively Polygon offers four frame size with a generous 496mm reach on the XL Shimano SLX 12 speed derailleur, shifter and cassette, but with a KMC chain The in-house Entity components are all top quality. The Siskiu gets a relatively slack 65.8º head angle for a stable steering response, ultra-short 430mm chainstays to make it easier to loft the front end, and generous reach measurements across the four frame sizes to guarantee a good fit. And while lots of brands make a big song and dance about custom sizing, but fail to provide short enough seat tubes with adequate dropper post insertion to make it possible to upsize, Polygon has nailed it on the Siskiu T8. With the 430mm seat tube we could comfortably ride the XL bike with the 170mm dropper with room to upgrade to a 200mm post if needed.  Detailing on the Siskiu frame is also first rate, from the copper highlights under the seat collar that matches the logo on the underside of the downtube, to the one-piece rocker link that adds frame stiffness while maintaining a minimalist, clean look. Even the bespoke chainstay protection looks fitting for a more expensive bike.  Cable routing on the Siskiu is internal on the front triangle, and thanks to tighter sealing on the entry and exit ports for the cables, there was no noticeable rattle. That’s not to say the Siskiu was a silent runner, however. The large loop of brake hose that’s necessary to prevent it from kinking as it exits the rear brake calliper has a tendency to touch the spokes of the rear wheel after the suspension has been compressed, so it can sound like you have a stick stuck in the swingarm. Suspension Getting Fox suspension on a £2k trail bike is quite a boon. And while the 140mm travel Fox 34 Rhythm fork isn’t quite as stout as the 35mm chassis on the RockShox equipped Jamis Faultline, an equivalently-priced bike, it’s only 1mm smaller, so nothing to write home about. The Fox 34 feels responsive and supple off the top, and with a good degree of ramp up it doesn’t bottom too easily on bigger hits. We measured the rear travel on the Siskiu frame at 136mm, so clearly there’s no rounding up here. The single pivot suspension design is controlled by an inline Fox Float DPS shock. It offers a really usable range of rebound adjustment that will comfortably cover a wide variety of rider weights. Using all of the travel doesn’t …Continue reading »

Highs
  • Progressive sizing and geometry, great value for money

Lows
  • Needs a Shimano chain

Read Review

BikeRadar
Polygon Siskiu T7 29 review

Jan 2023 · Luke Marshall

When it comes to bang for buck, the Siskiu T7 29 has to be one of the most impressive bikes out there

Highs
  • Geometry is on point for trail riding

  • Frame is future-proof and ready for upgrades

  • Decent tyres for getting rowdy

  • Capable suspension

  • 1x12 gears

Lows
  • Brakes are component weak link

  • Great for thrashing rather than mile munching

Read Review

Outdoor Gear Lab
Polygon Siskiu T8

Sep 2022 · Jeremy Benson

The Polygon Siskiu T8 is an excellent mid-travel trail bike offered at a reasonable price. Polygon's consumer-direct sales model helps keep it affordable...

Highs
  • Awesome build for the price

  • Versatile

  • Well-rounded performance

Lows
  • Firm grips

  • Saddle shape

Read Review

Pinkbike
Polygon's New 6 Bar Enduro Bike - Sea Otter 2022

Apr 2022 · James Smurthwaite

Polygon's race team has been spotted at Sea Otter on a new enduro bike that is due to replace the current Siskiu N9..

Read Review

Beta
The Beta Tests: Polygon Siskiu T8

Dec 2021 · Ryan Palmer

Possibly the best $2,500 bike we've ever ridden.

Highs
  • Fully capable, modern trail bike geometry

  • Excellent parts spec for the price

  • Internal cable routing

Lows
  • Resin-only brake rotors create weak braking

  • Suspension platform isn't very sophisticated

Read Review

Two Wheeling Tots
Polygon Siskiu D24 Full Suspension Kids Mountain Bike

Oct 2021 · Kelly Jorgensen

An affordable full suspension 24" kids mountain bike? The Polygon Siskiu D24 is a perfect blend of price and performance. Read the review!

Read Review

Bikerumor
New Polygon Siskiu T gets the right updates for seriously competitive & affordable trail bike

Aug 2020

Looking for a full suspension mountain bike you can actually afford? The Polygon Siskiu T just got overhauled, and it looks good.

Read Review

99 Spokes on YouTube99 Spokes on YouTube
Specs
Build
Frame

ALX XC Trail 6061 Aluminum Frame, 120mm Travel, Internal Routed Gear & Dropper Cables, Tapered Headtube, 73mm Threaded Boost BB, 148x12mm Boost Thru-Axle

BB StandardBSA, 73mm, Threaded

Fork

SR Suntour XCR 32, Air Spring, 120mm Travel (27.5" & 29"), Rebound & Compression Adjuster, 15x100mm Thru-Axle

Travel120mm

Spring TypeAir

Shock

X-Fusion O2 Pro RL, Air Spring, Rebound & Compression Adjuster, E2E 190x45mm, M8x25mm Hardware

Travel120mm

Spring TypeAir

Bottom Bracket

Shimano BSA Threaded 73mm

Headset

Threadless Zero Stack Headset, ZS 44/28.6 | ZS 56/40

Stem

Entity Sport, Alloy, 0 Degree

Handlebar

Entity Sport, Alloy, 12mm Rise, 6 Degree Back Sweep, 31.8mm

Saddle

Entity Void Saddle

Seatpost

TranzX JD-YSP23JL Dropper Post, Zero Offset, 30.9mm, Remote Lever

TypeDropper

Pedals

Flat Alloy

Groupset
Rear Derailleur

Shimano Deore RD-M5120, 10-Speed, Direct Mount

Crank

Shimano Deore FC-MT5100, 32T, 10-Speed, Hollowtech II, Boost

Shifters

Shimano SL-M4100 1x10-Speed Trigger

Cassette

Shimano CS-M4100, 10-46T, 10-Speed

Chain

KMC X10, 10-Speed

Brakes

Shimano BR-M201 Hydraulic

TypeHydraulic Disc

Wheels
Rims

Entity X15 Doublewall Disc 32H, 25mm Internal Width, Tubeless Ready **

Spokes

Entity Stainless, Brass Nipple

Front Hub

Shimano HB-MT400, Thru Axle 15x100mm, 32H Center-Lock

Rear Hub

Shimano FH-MT400, Thru Axle 12x148mm, 32H Center-Lock

Tires

Entity Spiderbait 27.5x2.25" / 29x2.25" *

Disc Rotors

Shimano SM-RT10 Centerlock, F: 180mm / R: 160mm

Rider Notes
Riders Also Viewed

Last updated September 23
Not listed for 913 days