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2021 Polygon

Siskiu D24X

A 24″ aluminum frame mountain youth bike with upper mid-range components and tektro hydraulic disc brakes.
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Manufacturer Price

$1,529
Weight30.0 lbs  
FrameAluminum
SuspensionFull, 120 / 120mm
ForkX-Fusion VELVET
ShockX-Fusion
Wheels24″ Aluminum
Drivetrain1 × 10
GroupsetDeore
BrakesTektro Hydraulic Disc
SeatpostDropper
Where to Buy
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Insights
Ride Feel

Based on frame geometry and build specs.

Handling
nimblestable
Siskiu D24X
Other Mountain Youth 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)

21 mph

Siskiu D24X

Highest gear

(descending)

Sizing
One Size

4'2" – 5'0"

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

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

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

Jan 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

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

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 XC Trail Kids 6061 Aluminum Frame, 120mm Travel, Internal Routed Gear & Dropper Cables, Tapered Headtube, 73mm Threaded BB, ISCG05 Chain Guide, 142x12mm Thru-Axle

BB StandardBSA, Threaded

Fork

X-Fusion Velvet 26", Air Spring, 120mm Travel, Rebound, Lockout, LockX Axle 15x100mm

Travel120mm

Spring TypeAir

Shock

X-Fusion O2 Pro, Air Spring, Rebound, Custom Tune

Travel120mm

Bottom Bracket

BB Cartridge, BSA Thread

Headset

Semi-Integrated Headset

Stem

Entity Sport, Alloy, Length: 40mm, BB: 31.8mm

Handlebar

Entity Sport, Alloy, Width: 640mm, Rise: 20mm

Saddle

Entity MTB Kids

Seatpost

Tranz-X JD-YSP23JL, Remote Lever, 30.9x350mm, 100mm Travel

TypeDropper

Pedals

Alloy Pedal

Groupset
Rear Derailleur

Shimano Deore RD-M5120, Clutch

Crank

Prowheel Charm, 32T, 140mm

Shifters

Shimano Deore SL-M4100, 1x10-speed

Cassette

Shimano Deore CS-M4100, 10-speed, 11-46T

Chain

KMC X10

Brakes

Tektro HD-J285, Hydraulic Disc

TypeTektro Hydraulic Disc

Brake Levers

Tektro HD-J2855, Short Lever Reach

Wheels
Rims

Entity X15 Disc, 32H, Internal Width: 24mm, Tubeless Tape Installed *

Spokes

14g Black Stainless Steel

Front Hub

Entity 15x100 / 12x142mm Thru-Axle, 32H, Sealed Bearings

Rear Hub

Entity 15x100 / 12x142mm Thru-Axle, 32H, Sealed Bearings

Tires

Vee Tire Flow Snap 24X2.4", Natural Wall, Folding Bead, Tackee Compound, Enduro Core, Tubeless Ready

Disc Rotors

Tektro TR 160-24, F/R: 160mm, 6-bolt

Rider Notes
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First added February 18

Last updated August 4

Not listed for 1,032 days