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2021 Polygon

SISKIU N9

A 27.5″ / 29″ aluminum frame full suspension enduro bike with high-end components.
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Manufacturer Price

$3,399
Weight39.9 lbs  
FrameAluminum
SuspensionFull, 170 / 170mm
ForkFox Performance Float 36
ShockFox Float DPX2 Performance
Wheels27.5″ / 29″ Aluminum
Drivetrain1 × 12
GroupsetXT
BrakesTRP Slate T4 Hydraulic Disc
SeatpostDropper
Where to Buy
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Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
SISKIU N9
Other Enduro bikes
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)

28 mph

SISKIU N9

26 mph

Similar Bikes

Highest gear

(descending)

Sizing
SM

5'0" – 5'5"

MD

5'3" – 5'9"

LG

5'7" – 6'1"

XL

5'11" – 6'5"

Rider Fit Notes

None yet.

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Reviews

Summary

The Polygon Siskiu trail bike family is celebrated for its modern geometry, excellent value, and versatile performance across various terrains. Reviews highlight its efficient climbing, playful descending, and plush suspension, making it a standout in its price range. While some components like brakes and suspension sophistication are noted as areas for improvement, the overall package is praised for its capability and fun factor.

Pros
  • Modern trail bike geometry

  • Excellent value for the price

  • Plush and active suspension

  • Efficient climber

  • Playful and confident descender

Cons
  • Resin-only brake rotors limit braking power

  • Suspension platform could be more sophisticated

  • Some components may require upgrades for aggressive riding

Key Quotes
Seriously, this has got to be the best $2,500 bike we’ve tested to date.
Beta logoBeta
The Siskiu T8’s most endearing trait is just how playful it is on the trail.
Flow Mountain Bike logoFlow Mountain Bike
The reasonably priced Siskiu D7 is an excellent, affordable option to consider.
Outdoor Gear Lab logoOutdoor Gear Lab
My kid said he had never had so much fun on a bike in his life.
Two Wheeling Tots logoTwo Wheeling Tots

Feedback?

View all reviews

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

Outdoor Gear Lab
Polygon Siskiu D7

Oct 2021 · Jeremy Benson

As the price of bikes continue to skyrocket, Polygon bucks that trend with their direct-to-consumer sales model and the affordable Siskiu D7. This...

Highs
  • Reasonable price

  • Comes with a dropper post

  • Fun on a range of terrain

  • Efficient climber

  • Playful on descents

Lows
  • Non-boost fork

  • Some cable rattle over rough terrain

  • Can be overwhelmed on aggressive trails

Read Review

Loam Wolf
Review: Polygon Siskiu T8

Dec 2020

POLYGON SISKIU T8 REVIEW TESTING THEN UPGRADING A BUDGET-MINDED BIKE The Polygon Siskiu T series bikes are some of the best looking, affordable dual suspension mountain bikes on the market and we get lots of questions about them. Several months back we actually made a really

Read Review

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

Aug 2020 · Zach Overholt

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

Read Review

NSMB
Polygon Siskiu N9 160mm 29'er Review

Feb 2020

Polygon's 160mm aluminum 29'er looks to deliver value and performance and shows potential for 2800 USD...

Read Review

Flow Mountain Bike
Tested: Polygon Siskiu N9 2019

Nov 2018

What makes this bike special? It’s not just the price, though at $3699, this one is hard to beat. Even when stacked up against other direct-to-the-consumer brands like YT, this bike holds its own in sheer value for money terms. The frameset is far from revolutionary, all aluminium, with a simple faux-bar suspension system. But …

Highs
  • Smart component choices.

  • Great fork and shock.

  • Geometry that most riders will feel instantly comfortable with.

  • The price, obviously!

Lows
  • Short travel dropper post.

  • No water bottle mount.

Read Review

Pinkbike
Review: Polygon Siskiu T8

Sep 2018 · Richard Cunningham

Add this well-outfitted and sharp-handling 29er to your short list of affordable trail bikes.

Highs
  • Lively acceleration and climbing

  • Precise handling and cornering

  • Excellent value

Lows
  • No room for a water bottle

  • Not plush in rough terrain

  • No size small with 29-inch wheels

Read Review

Geometry
Specs
Build
Frame

ALX AM / ENDURO 170MM TRAVEL (27.5”) / 160MM TRAVEL (29”), TAPER H/T TA BOOST

BB StandardBSA, 73mm, Threaded

ColorRadiant Galaxy - Black

Fork

FOX PERFORMANCE 36 FLOAT 170MM (27.5”) / 160MM (29”) TRAVEL

Travel170mm

Spring TypeAir

Shock

FOX PERFORMANCE FLOAT DPX2 E2E:205X65, 3 POS LEVER, LV EVOL, HARDWARE:8MMX25MM & TRUNNION

Travel170mm

Bottom Bracket

SHIMANO BSA THREADED

Stem

RACEFAE AEFFECT R35, ALLOY E:50MM R:0DEG BB:35MM

Handlebar

RACEFACE AEFFECT R35, ALLOY W:780MM R:20MM BB:35MM

Saddle

ENTITY XTENT

Seatpost

DROPEPR POST 150mm (S&M) / 170mm (L & XL)

TypeDropper

Pedals

ALLOY FLAT PEDAL W/REPLACEABLE PIN

Groupset
Rear Derailleur

SHIMANO XT RD-M8100 12-SPEED DA

Crank

SHIMANO DEORE XT FC-M8100-1 BOOST 12SP 32T 170MM (S-M) 175MM (L-XL)

Shifters

SHIMANO XT SLM8100 12-SPEED

Cassette

SHIMANO XT CSM8100 12-SPEED 10-51T

Chain

SHIMANO CN-M7100

Brakes

TRP SLATE T4 4 PISTON

TypeTRP Slate T4 Hydraulic Disc

Wheels
Rims

ENTITY XL2 DISC 35-584 (27.5”) / 35-622 (29”)

Spokes

Stainless Steel Spokes

Front Hub

Entity, sealed bearings

Rear Hub

Entity, sealed bearings

Tires

WTB VIGILANTE 27.5”X2.6 / 29”X2.3

Disc Rotors

Shimano SLX SM-RT70, Rotors F/R: 180/180mm

Rider Notes
Riders Also Viewed

First added December 22

Last updated December 5

Not listed for 1,274 days