2023 Polygon

SISKIU T8

A 27.5″ / 29″ aluminum frame full suspension enduro bike with upper mid-range components.
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MSRP$2,199  
Weight33.5 lbs  
FrameAluminum
SuspensionFull, 135 / 150mm
ForkFox Rhythm Float 34
ShockFox Float DPS Performance
Wheels27.5″ / 29″ Aluminum
Drivetrain1 × 12
GroupsetSLX, Shimano
BrakesHydraulic Disc
SeatpostDropper
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Ride Feel

Based on frame geometry and build specs.

Terrain
easyextreme
Handling
nimblestable
SISKIU T8
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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)

25 mph

SISKIU T8

26 mph

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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
Sizing
SM

4'11" – 5'5"

MD

5'3" – 5'9"

LG

5'7" – 6'1"

XL

5'11" – 6'5"

Rider Fit Notes

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Price History
Reviews
BikeRadar
Polygon Siskiu T8 review

Oct 2023 · Mick Kirkman

The Siskiu T8 offers an impressive spec and is deceptively capable downhill. It’s not the best all-rounder, though, and won’t cover flatter ground as quickly as some

Highs
  • Suspension delivers a calm and secure ride feel

  • Impressive-value components

  • Drivetrain and fork/shock combo are sorted for the cash

Lows
  • Feels more of an enduro than trail bike when it comes to hammering uphill or snaking along flatter singletrack

Read Review

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

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

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

Geometry
99 Spokes on YouTube99 Spokes on YouTube
Specs
Build
Frame

aluminum

BB StandardBSA, 73mm, Threaded

ColorRadiant Purple - Black

Fork

FOX 34 RHYTHM 150mm (27.5") / 140mm (29") TRAVEL

Travel150mm

Spring TypeAir

Shock

FOX FLOAT DPS SPECIAL TUNING E2E:210X55MM, HARDWARE:8MMX25MM

Travel135mm

Spring TypeAir

Bottom Bracket

SHIMANO 2-PIECE CRANKSET BSA THREADED

Headset

ZERO STACK (ZS) SEALED BEARING FOR TAPER HEAD TUBE, ZS 44/28.6 | ZS 56/40

Stem

Entity Xpert, Alloy, 35mm

Handlebar

ENTITY XPERT, ALLOY W:780MM R:20MM BB:35MM

Saddle

ENTITY XTENT

Seatpost

TRANZ-X 150MM (S-M) 170 (L-XL) TRAVEL, ZERO OFFSET, 30.9MM

TypeDropper

Pedals

ALLOY FLAT PEDAL W / REPLACEABLE PIN & REFLECTOR

Grips

Polygon Lock On

Groupset
Rear Derailleur

SHIMANO SLX RD-M7100-SGS DIRECT ATTACH

Crank

SHIMANO MT-510-1 BOOST 32T

Shifters

SHIMANO SLX SL-M7100-R, 1x12-SPEED TRIGGER

Cassette

12 SPEED 11-51T

Chain

KMC X12 12SPEED

Brakes

TEKTRO HD-M745 4-PISTONS HYDRAULIC DISC BRAKES

TypeHydraulic Disc

Brake Levers

TEKTRO LEVER

Wheels
Rims

584 / 622-35 32H FOR TYRE 584 / 622-54/76 TUBELESS READY

Front Hub

Novatech D91SB-CL, Thru Axle 15x110mm 32h, Center Lock

Rear Hub

Novatec D462SB, 12x148mm, HG Freehub, 32h, Center Lock

Tires

PERFORMANCE TIRE, 27.5”X2.40” / 29”X2.40”

Disc Rotors

SHIMANO SM-RT54 180mm CENTER-LOCK

Rider Notes
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Last updated April 8