Bikes up to 60% offWe monitor over 40,000 bikes daily to find the best prices

Today’s Deals

2021 Polygon

SISKIU D5

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

Manufacturer Price

1249 US$(1074 €)
Weight17,0 kg  
FrameAluminum
SuspensionFull, 120 / 100mm
ForkSuntour XCM
ShockSuntour
Wheels27.5″ Aluminum
Drivetrain1 × 9
GroupsetAlivio, Altus
BrakesShimano Hydraulic Disc
Where to Buy
Similar Bikes
Top Comparison
Insights
Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
SISKIU D5
Other Trail 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)

43 km/h

SISKIU D5

42 km/h

Similar Bikes

Highest gear

(descending)

Sizing
SM

152cm – 165cm

MD

162cm – 175cm

LG

172cm – 185cm

Rider Fit Notes

None yet.

Do you have this bike? Help other riders make a decision about which size will work for them by sharing your own size and fit notes.

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

dic 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!

Highs
  • Low price point for full suspension with modern geometry

  • Lightweight for price and build

  • Tune-able air sprung fork (with lockout) and rear shock

  • Thru-axles for increased stiffness and rigidity

  • Internal routing for dropper post

  • 1x trigger shifters for quick and easy shifting

  • Pre-taped tubeless ready rims

Lows
  • Mechanical disc brakes not ideal

  • Does not come with tubeless ready tires (only rims)

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

Flow Mountain Bike
Polygon Siskiu T8 Review | Big fun without the big price tag

ene 2021

Polygon's updated Siskiu T is proof that you don't have to spend the earth to get a very capable trail bike. Featuring on-trend geometry, a robust build kit and a host of improvements over the old model, the Siskiu T8 will have you questioning why you'd need to spend any more.

Highs
  • Exceptionally capable package for the money

  • Confidence-inspiring geometry

  • Grippy high-volume rubber

  • Supple & supportive suspension

  • Sporty handling for a tough trail bike

Lows
  • Handlebars need more sweep

  • Brakes aren't hugely powerful

  • The wheels ain't light

Read Review

Loam Wolf
Review: Polygon Siskiu T8

dic 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

ago 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

Pinkbike
Review: Polygon Siskiu T8

sept 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 XC 120MM TRAVEL (27.5”) TAPER H/T QR BOOST

ColorGrey / Maroon

Fork

SR SUNTOUR XCM HLO, QR 100MM, 120MM (27.5”) TRAVEL

Travel100mm

Spring TypeCoil

Shock

SR SUNTOUR RAIDON LO AIR E2E:190X51MM HARDWARE:M8X22MM

Travel120mm

Bottom Bracket

INCLUDE CRANKSET

Headset

ZS 44/28.6 | ZS 56/40

Stem

ENTITY SPORT, ALLOY

Handlebar

ENTITY SPORT, ALLOY

Saddle

ENTITY VOID SADDLE

Seatpost

ENTITY SPORT, ALLOY

TypeRigid

Pedals

-

Groupset
Rear Derailleur

SHIMANO RD-M3100

Crank

SHIMANO ALTUS FC-MT2102 36T

Shifters

SHIMANO SL-M3100, 2x9 SPEED TRIGGER

Cassette

SHIMANO CS-HG200 11-36T

Chain

KMC X9

Chain Guide

none

Brakes

SHIMANO HYDRAULIC DISC BRAKE

TypeShimano Hydraulic Disc

Brake Levers

SHIMANO BL-M201 HYDRAULIC DISC BRAKE

Wheels
Rims

ALLOY DOUBLE WALL 32H

Tires

SPIDERBAIT TIRE 27.5"x2.25"

Disc Rotors

SHIMANO SM-RT10 F:180MM / R:160MM

Rider Notes
Riders Also Viewed

First added 12 de mayo

Last updated 12 de febrero

Not listed for 1,205 days