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POLYGON Sisku D5 27.5” Full Suspension Mountain Bike

£900.00£1,000.00(Save 10%)

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The Sisku D5 from Polygon is an entry level full suspension mountain bike designed to take on everything from local single track trails, to all-day adventures in the mountains.

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Product code: 16185420 / 498336

The Polygon Sisku D5 is an all-round XC trail full suspension bike engineered for everything from local trail fun to all day mountain epics. Built around a lightweight aluminium suspension frame, the Sisku vD5 has modern geometry, slacker head tube angle, longer reach, lower BB and shorter chain-stay. Shimano hydraulic disc brakes ensure excellent stopping power and this model is offered in 27.5” wheel size. The 120mm suspension has a one-piece linkage system reducing flex in rear triangle.

About Polygon

Polygon are a world-renowned bike manufacturer with over 25 years of cycling expertise. Producing close to a million bikes a year out of their state-of-the-art manufacturing facilities, their commitment to innovation and craftsmanship has seen them pick up numerous industry awards and become the brand of choice for leading professionals. You’ll be in good company when you ride a Polygon.


  • Available in Small & Large. See images for size information.
  • Entry level all-round trail 27.5” mountain bike from Polygon
  • Frame: ALX XC 120mm Travel (27.5”) Taper H/T QR Boost
  • Dropout: Alloy QR Dropout
  • Fork: SR Suntour XCM HLO, QR 100mm, 120mm (27.5”) Travel
  • Rear Shock: SR Suntour Raidon LO Air E2E: 190mm x 51mm
  • Handle Bar: Entity Sport, Alloy
  • Stem: Entity Sport, Alloy
  • Grips/Bar Tape: Entity Rubber Grip
  • Head Set: Threadless Zero Stack Headset
  • Saddle: Entity Void Saddle
  • Seat Post: Entity Sport, Alloy
  • Seat Clamp: QR Seat Clamp
  • Chain Set: Shimano Altus FC-MT2102 36T
  • BB Set: Include Crank Set
  • Chain: KMC X9
  • Cassette: Shimano CS-HG200 11-36T
  • Shifting Lever - Right: Shimano SL-M31000, 2x9 Speed Trigger
  • Rear Derailleur: Shimano RD-M3100
  • Front & Rear Tyres: Spiderbait Tyre 27.5” x 2.25”
  • Rims: Alloy Double Wall 32H
  • Front Hub: Alloy Front Hub
  • Rear Hub: Alloy Rear Hub
  • Front & Rear Brake: Shimano Hydraulic Disc Brake


**Some minor assembly is required. See our video (below) or 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. 

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We are not able to accept bike returns at any Millets stores

If you change your mind you can return your bike within 28 days of delivery for a refund to our Returns department. You may also return bikes to any GO Outdoors store (excluding Hathersage and Southport) who will return it for you free of charge. A refund will be issued once it is processed by our Returns department.

If your bike develops a fault please take it to your nearest GO Outdoors store (excluding Hathersage and Southport) where we have a full workshop and trained mechanics who will be able to assist you. If you believe there is a fault with your bike please do not send it back to our warehouse as they are unable to process or repair bikes.

This product qualifies for the following delivery methods

Standard UK Delivery (3 - 5 Days) (FREE)


A tracking link will be provided once your order is despatched.

Premium Express Delivery (£6.95)


A tracking link will be provided once your order is despatched.

Bike Delivery (Up to 7 Days) (FREE)


This applies to all bikes, and these orders are upgraded to a specialist courier service.

Free Standard In Store (FREE)


Collect In Store (FREE)


Premium Next Day (£6.95)


Next day cannot be offered in the following areas, and will be attempted within 48 hours: BT (all Northern Ireland), GY, IM, JE, KW11-17, HS, PH32-35, ZE.

International delivery

From £4.99 to over 200 countries worldwide. Some restrictions apply.

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