Bikes up to 60% offWe monitor over 40,000 bikes daily to find the best prices
Today’s Deals2020 Polygon
SISKIU D5
A 27.5″ aluminum frame full suspension trail bike with mid-range components.
Compare the full range
Manufacturer Price
$1,179| Weight | 37.5 lbs |
|---|---|
| Frame | Aluminum |
| Suspension | Full, 120 / 100mm |
| Fork | Suntour XCM |
| Shock | Suntour |
| Wheels | 27.5″ Aluminum |
| Drivetrain | 1 × 9 |
| Groupset | Alivio, Altus |
| Brakes | Shimano Hydraulic Disc |
5'0" – 5'5"
5'3" – 5'9"
5'7" – 6'1"
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.
Summary
The Polygon Siskiu trail bike series is praised for its modern geometry, competitive pricing, and improved specifications, making it a strong contender in the affordable trail bike market. Reviews highlight its effective rear suspension and trail-ready handling, though some models suffer from subpar fork performance and component limitations. The Siskiu stands out for its value, offering features like dropper posts and quality drivetrains at lower price points than many competitors.
Modern, well-considered geometry
Competitive pricing with improved specifications
Effective rear suspension with good progression
Dropper post included at affordable price points
Quality drivetrains and brakes in higher models
Subpar fork performance in some models
Component choices limit the bike's potential
Uncomfortable stock saddle and grips
Limited water bottle mounting in some frames
Heavy weight with 29in wheels in certain builds
The bike seemed to offer more performance than the price would imply, and it seemed like a platform worthy of future upgrades.
BikerumorPutting together well-appointed bikes for less money than its big-name competitors is a game that Polygon plays exceedingly well.
Flow Mountain BikeThe potential that's unrealized with this bike is both impressive at the price and depressing at the same time.
NSMBFeedback?
View all reviews
Dec 2021 · Ryan Palmer
Possibly the best $2,500 bike we've ever ridden.
Fully capable, modern trail bike geometry
Excellent parts spec for the price
Internal cable routing
Resin-only brake rotors create weak braking
Suspension platform isn't very sophisticated
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!
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
Nov 2020 · 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...
Awesome build for the price
Versatile
Well-rounded performance
Firm grips
Saddle shape
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.
Jun 2020
With its sub-$2K price tag, the Polygon Siskiu D6 aims to break the normal rules in the hardtail vs full suspension debate. Featuring a dropper post, progressive geometry, and a new frame that will take a water bottle, there's a lot to like. But is it too good to be true? Read on for our Polygon Siskiu D6 review.
Fantastic trail-ready geometry
A dropper post at this price? So good!
Nice under-bar dropper lever
Smooth and reliable Shimano brakes
Bonkers price
The fork-shaped object
Quick-release front axle
Handlebar needs more sweep
Brake levers & shifter don't quite line up
Feb 2020
Polygon's 160mm aluminum 29'er looks to deliver value and performance and shows potential for 2800 USD...
Sep 2018 · Richard Cunningham
Add this well-outfitted and sharp-handling 29er to your short list of affordable trail bikes.
Lively acceleration and climbing
Precise handling and cornering
Excellent value
No room for a water bottle
Not plush in rough terrain
No size small with 29-inch wheels
| Frame | ALX XC 120MM TRAVEL (27.5”) TAPER H/T QR BOOST Color: Grey / Maroon |
|---|---|
| Fork | SR SUNTOUR XCM HLO, QR 100MM, 120MM (27.5”) TRAVEL Travel: 100mm Spring Type: Coil |
| Shock | SR SUNTOUR RAIDON LO AIR E2E:190X51MM HARDWARE:M8X22MM Travel: 120mm |
| Bottom Bracket | INCLUDE CRANKSET |
| Stem | ENTITY SPORT, ALLOY |
| Handlebar | ENTITY SPORT, ALLOY |
| Saddle | ENTITY VOID SADDLE |
| Seatpost | ENTITY SPORT, ALLOY Type: Rigid |
| Pedals | - |
| 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 |
| Brakes | SHIMANO HYDRAULIC DISC BRAKE Type: Shimano Hydraulic Disc |
| Rims | ALLOY DOUBLE WALL 32H |
|---|---|
| Tires | SPIDERBAIT TIRE 27.5"x2.25" |
First added March 11
Last updated April 22
Not listed for 1,866 days