Black POLYGON Siskiu T8 29” Full Suspension Mountain Bike image 1
Black POLYGON Siskiu T8 29” Full Suspension Mountain Bike image 2
Black POLYGON Siskiu T8 29” Full Suspension Mountain Bike image 3

Key featuresexpand_more

When it comes to the descent, the T8 is a ninja. Its long reach and slack front end put you in a stable and confidence-inspiring riding position. The short stem and chainstay keep the T8 agile, even with 29-inch wheels. This bike’s geometry and componentry give you the self-assurance to weave through tight turns and technical features at speed.

It is impressive for a bike at this price point to be kitted out with FOX front and rear suspension. The FOX 34 Rhythm Fork is supple off the top for absorbing vibrations from the trail but ramps up at the bottom to deal with big hits. At the rear, the FOX Float shock has a very usable range of rebound adjustment, so it's tuneable for riders of all weights.

On the ascents, a steep seat tube angle puts you in a perfect position for climbing. Combined with the premium SLX 12-speed drivetrain, this bike has real climbing credentials. Locking off the suspension, a nice added benefit of running FOX components, helps with grinding up extra steep climbs.

Polygon went the whole hog with the T8, so it’s a mouth-watering proposition for any serious mountain biker with a modest budget.

Rated 9/10 by MBR magazine, who called it "one of the best cheap mountain bikes out there, a budget full-suspension bike with modern geometry and progressive sizing".

Feature Highlights

  • 6061 butted aluminium frame – A strong and lightweight aluminium alloy frame with dependable weld integrity.
  • 140mm FOX Rhythm fork – A customisable air-sprung suspension fork with stiff 34mm stantions for serious mountain biking.
  • Shimano SLX 1x12 drivetrain – Premium gear-shifting finesse from the maestros at Shimano.
  • Tektro HD-M745 – Impressive four piston stopping power that rivals products from SRAM and Shimano.
  • 150mm TransX dropper seat post – A reliable hydraulic dropper post with 150mm of travel. Puts the saddle exactly where you need it
  • 135mm Fox Float DPS rear shock – Lots of rear wheel travel with a plush feel and plenty of adjustability.
  • Hans Dampf tyres – Ultra-grippy tyres with Enduro and Downhill pedigree.

About Polygon

Polygon is a world-renowned bike manufacturer with over 25 years of cycling expertise. Producing close to a million bikes at a state-of-the-art manufacturing facility, Polygon’s commitment to innovation and craftsmanship has picked up numerous industry awards.


  • Trail-ready full suspension 29” mountain bike
  • Frame: ALX Trail Frame 135mm Travel (29”)
  • Dropout: Alloy Thru Axle Dropout
  • Fork: Fox 34 Rhythm Boost 15x110mm, 140mm (29”)
  • Rear Shock: Fox Float DPS Special Tuning E2E: 210x55mm, Hardware: 8mmx25mm
  • Handle Bar: Entity Xpert, Alloy W: 780mm R: 20mm BB: 35mm
  • Stem: Entity Xpert, Alloy E: 35mm R: 7DEG BB: 35mm
  • Grips/Bar Tape: Entity Rubber Grip W/ Lock Ring
  • Head Set: ZS 44/28.6|ZS 56/40
  • Saddle: Entity Xtent
  • Seat Post: Dropepr Post 150mm
  • Seat Clamp: Bolt Seat Clamp
  • Chain Set: Shimano FC-MT510-1 Boost 32T 170mm
  • BB Set: BSA Threaded
  • Chain: KMC X12 12 Speed
  • Cassette: Shimano CS-M7100-12 SLX 10-51T
  • Shifting Lever – Right: Shimano LD-M7100-R SLX
  • Rear Derailleur: Shimano RD-M7100 SLX
  • Tyres Front & Rear: Performance Tyre 29”x2.40”
  • Rims: Entity XL2 Disc 622-35 (29”)
  • Front Hub: Shimano Front Hub
  • Rear Hub: Shimano Rear Hub
  • Through Axle: Alloy Thru Axle Dropout
  • Front & Rear Brake: Tektro HD-M745 4 Piston

Order your bike to be delivered to your home or collect it from a GO Outdoors store to access some great benefits.

Please Note: Due to ongoing issues in the supply chain, this bike is subject to specification changes without notice. Any changes made will be using equivalent or higher quality parts.

**Some minor assembly is required. Consult our assembly guide for assistance.

Unfortunately, we are not able to process faulty or warranty bike returns through our warehouse. If your bike develops a fault, please take it to your nearest GO Outdoors store where we have a full workshop and trained mechanics who will be able to assist you.

Please note, this excludes Hathersage and Southport stores.

Delivery & Returnsexpand_more

This product qualifies for the following delivery methods.

Standard UK Delivery (FREE)

Delivered between 8am and 8pm, Monday-Saturday. Excluding bank holidays. A tracking link will be provided once your order is despatched.


Returning orders to us is easy. Whatever your reason, we offer a refund or exchange within 28 days of delivery or collection.

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