Siskiu D5
A 27.5″ aluminum frame full suspension trail bike with mid-range components.
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Manufacturer Price
$899Weight | 36.8 lbs |
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Frame | Aluminum |
Suspension | Full, 120 / 100mm |
Fork | Suntour XCM |
Shock | Suntour |
Wheels | 27.5″ Aluminum |
Drivetrain | 2 × 9 |
Groupset | Alivio, Altus |
Brakes | Hydraulic Disc |
For This Bike
Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more.
Compare the full Siskiu model range
View Comparison5'0" – 5'5"
5'2" – 5'8"
5'5" – 6'1"
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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.
Capability
4 piston brakes
Price point
Tektro Brake Levers
Requires precise shock settings
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 »
Progressive sizing and geometry, great value for money
Needs a Shimano chain
Jan 2023 · Luke Marshall
When it comes to bang for buck, the Siskiu T7 29 has to be one of the most impressive bikes out there
Geometry is on point for trail riding
Frame is future-proof and ready for upgrades
Decent tyres for getting rowdy
Capable suspension
1x12 gears
Brakes are component weak link
Great for thrashing rather than mile munching
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...
Awesome build for the price
Versatile
Well-rounded performance
Firm grips
Saddle shape
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..
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!
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.
Exceptionally capable package for the money
Confidence-inspiring geometry
Grippy high-volume rubber
Supple & supportive suspension
Sporty handling for a tough trail bike
Handlebars need more sweep
Brakes aren't hugely powerful
The wheels ain't light
Frame | ALX XC 120MM TRAVEL (27.5") TAPER H/T QR BOOST BB Standard: BSA, 73mm, Threaded |
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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 Spring Type: Coil |
Bottom Bracket | BSA THREADED |
Headset | ZS 44/28.6 | ZS 56/40 |
Stem | ENTITY SPORT, ALLOY E:45MM R:-DEG BB:31.8MM |
Handlebar | ENTITY SPORT, ALLOY W:760MM R:12MM BB:31.8MM |
Saddle | ENTITY VOID, STEEL RAIL |
Seatpost | ENTITY SPORT, 0MM OFFSET, 30.9MMX350MM Type: Rigid |
Pedals | PP FLAT PEDAL |
Rear Derailleur | SHIMANO ALIVIO RD-M3100 9-SPEED DA |
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Front Derailleur | SHIMANO ALIVIO FD-M3120-E |
Crank | SHIMANO ALTUS FC-MT2102 BOOST 9SP 36X22T 170MM |
Shifters | SHIMANO ALIVIO SL-M3100 9-SPEED |
Cassette | SHIMANO CS-HG200 9-SPEED 11-36T |
Chain | KMC X9 9 SPEED |
Chain Guide | none |
Brakes | Hydraulic Disc Type: Hydraulic Disc |
Brake Levers | SHIMANO BL-M201 HYDRAULIC DISC BRAKE |
Rims | Entity X15 Doublewall Disc 32H, 24mm Internal Width, Tubeless Compatible** |
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Spokes | Stainless Steel Spokes |
Front Hub | Alloy 32H, Center Lock, F: QRx100mm / R: QRx141mm |
Rear Hub | Alloy 32H, Center Lock, F: QRx100mm / R: QRx141mm |
Tires | ENTITY SPYDERBAIT 27.5"X2.25* |
Last updated May 20