2019 Polygon Siskiu D7 Dual Suspension Mountain Bike

WAS $1,699.00 You Save $200.00

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Key Features

  • ASX Advanced Alloy linkage driven single pivot XC frame with 4.7" of suspension travel and 2THRU axle system
  • Internal routing
  • Tapered Head Tube
  • Rockshox 30 Silver Solo Air, Travel 120mm 
  • Suntour Unair LO-R Air rear shock with hydraulic lockout
  • 20 Speed Shimano Deore XT / Deore groupset
  • 5 Year Warranty on frame
  • Full manufacturer’s warranty on parts
  • Weight 14.4kg (Medium frame including Pedals)
  • The 9mm quick release can be run with a 135mm setup ( As supplied with the bike ) using the two supplied spacers or you can run a 12mm through axle at a 142mm setup without the spacers if you require.

Now on its third iteration, the refined and tweaked Polygon Siskiu D7 builds on the core principles that have made it one of Bicycles Online's best selling bikes on the market. The Polygon Siskiu D received consistent, positive feedback from the industry last year. Flow Mountain Bike's review noted the Siskiu D had "such solid performance and reliability from the components fitted to a sturdy and well-thought-out frame". Mountain Bike Australia Magazine also reviewed the Siskiu D and said the bike had "amazing spec for the dollars" which have been built around a frame that was "stiff and respectively light" Capitalizing on extensive R&D, state of the art testing facilities and feedback from top-level riders, the Polygon Sikiu D7 continues to defy what an extremely good value dual suspension mountain bike is capable of.

Based on a Single Pivot suspension system, the Polygon Siskiu D7 is impeccable in small bump compliance with a progressive rear shock rate that will let you know when you're nearing its 120mm travel limit. The Hydroformed 6061 Aluminium frame on the Siskiu D7 is better than ever before, featuring small tweaks to further improve your riding experience. Lastly, a tapered headtube, single piece linkage, internally routed gear cables and rear thru axle are Polygon's commitment to making the Siskiu D7 a bike that will stand the test of time.

When you combine a tested and reliable suspension system platform with a trail ready suspension fork and shock, you create a symbiosis that works in your favour, keeping you glued to the trails and always in control. The Rockshox 30 Solo Air paired with the SR Suntour Unair are key elements on this finely tuned balance Polygon has created. Up front, the Rockshox 30 Solo Air gives you precise handling over rough stuff with predictable behaviour and tuneable compression, dampening and rebound. On the rear, the Unair shock helps the rear wheel track the ground better via reduced friction due to a slippery stanchion coating. Both fork and shock on the Polygon Siskiu D7 are lockable for extra performance on strong pedalling efforts out of the saddle. 

Shimano provides the tools to keep you moving regardless of the terrain you're facing. With a double chainring crankset and an 11-36T cassette, you can trust the Polygon Siskiu D7 will help you climb even the steepest of hills or race your mates on the downhill with some of the lightest components available. Keeping everything under control is a Shimano XT 10 Speed Clutch rear derailleur, a crucial component on modern mountain bikes, adding a hefty sense of control over your gear selection and reducing chain-slap to a minimum, so you can focus all your attention on any of the obstacles the trail throws your way.


Rounding out the Polygon Siskiu D7 is a pair of Shimano Hydraulic Disc Brakes, Double wall alloy rims with Shimano hubs, Schwalbe Smart Sam tyres, and an Entity cockpit. If you're looking for a bike to do it all with killer style and a dependable, high quality, trail ready components list, then the Siskiu D7 is the bike for you.


Model Comparison Chart


Siskiu D5

Siskiu D7

Forks SR Suntour XCM Hydraulic Lockout, Travel 120mm, coil Rockshox 30 Silver Solo Air, Travel 120mm Hydraulic lockout
Weight 14.5kg 13.5kg
Drivetrain Shimano Alivio/Deore Shimano XT/Deore
Speed 27 Speed 2x10 - 20 Speed
Brakes Shimano BR-M315 Hydraulic Disc Brakes Shimano M365 Hydraulic Disc Brakes
Wheelset Araya DM-650 Doublewall alloy Araya DM-650 Doublewall Alloy
Price $1,099 $1699

Shimano Hubs

Rear thru axle



2019 Polygon Siskiu D7 (27.5 inch)

2018 Giant Anthem 3



ALX Alloy Cross Country, 120mm travel

Alloy Cross Country frame 90mm travel



Rockshox 30 Silver Solo Air, Travel 120mm, Lockout lever on fork

RockShox Recon RL Solo Air, 100mm Travel

Giant better


SR Suntour Unair LO-R, 190x45mm

RockShox Deluxe RT

Giant better


Entity Expert, Alloy, 740mm, 

Giant Connect 780mm 31.8 Alloy



Entity Expert, Alloy 60mm

Giant Connect Alloy



FSA Cartridge Sealed Bearing

Giant Sealed Bearing



Entity Assault Saddle

Giant Contact Neutral



Entity Expert, Alloy, 30.9mm

Giant Connect, Alloy 27.2mm



Shimano Deore FC-M617, 36x22T

Shimano Deore M6000 36x22T



VP Component VP-349, Alloy

None included

Polygon better


Shimano Hollowtech 2 Integrated

Shimano Press-Fit



Shimano Deore HG50 11-36T

Shimano Deore HG50



Shimano Deore FD-M617-E, side-pull

Shimano Deore



Shimano Deore XT RD-M786SGS Clutch

Shimano Deore

Polygon better


Shimano Deore SL-M610 - 20sp

Shimano Deore - 20sp



Shimano M365 Hydraulic

Shimano MT500 Hydraulic



Schwalbe Smart Sam, 27.5”x2.25”

Maxxis Ikon

Giant better


Araya DM 650

Giant XC3 



Stainless Steel Spokes




Shimano RM33

Giant Sport Tracker, sealed bearings

Polygon better


Yes (some regional and remote postcodes excluded)


Polygon better



$2,999 (Source: Giant Website AUS July 2018)

$1,400 Difference

Size Chart




RIDER HEIGHT 160-170cm 170-180cm 180-190cm
SEAT TUBE LENGTH 15.5" 17.5" 19.5"


Note: If you are in between sizes, measure your wingspan. If it is greater than your height, go for the frame size up. If your height is greater than your wingspan, go for a frame size down.



Siskiu D7

Sizes (A) Stack (mm) (B) Reach (mm) (C) Head Tube Angle (D) Head Tube Length (mm) (E) Head Tube Diameter (mm) (F) Seat Tube Angle (G) Seat Tube Length (C-T) (mm) (H) Top Tube Actual (mm) (I) Top Tube Effective (mm) (J) Front Center (mm) (K) Fork Offset (mm) (L) Rear Center (mm) (M) BB Height (Ground Clerance) (mm) (N) BB Height (BB Drop/Rise) (O) Stand Over Height (mm) (P) Rear Wheel Axle / O.L.D (mm) (Q) Seatpost Size (mm)
15 583 403 67.5 115 ZS44 | ZS56 74.5 385 549 565 684 44 438 331 22 Drop 673 142 x12 / 135 x 9 (2HRU Axle system) 30.9
17 583 423 67.5 115 ZS44 | ZS56 74.5 435 564 585 704 44 438 331 22 Drop 700 142 x12 / 135 x 9 (2HRU Axle system) 30.9
19 592 446 67.5 125 ZS44 | ZS56 74.5 485 589 610 730 44 438 331 22 Drop 736 142 x12 / 135 x 9 (2HRU Axle system) 30.9
20.5 592 466 67.5 125 ZS44 | ZS56 74.5 520 612 630 750 44 438 331 22 Drop 754 142 x12 / 135 x 9 (2HRU Axle system) 30.9



We understand how important shipping is once you click "buy now", that's why we have the following policies

Australian Warehouse

All products are in stock and ready to ship from our Sydney warehouse (with the exception of preordered bikes, which have the dispatch date illustrated)

Next day dispatch

All orders received by 5 pm AEST will usually be dispatched the following business day. If an order is placed on the weekend or public holiday, please note dispatch will usually be the next working day. For tracked shipments, please allow 12 hours for tracking to begin.

Shipping of Parts, Accessories and Apparel

Economy Shipping

There is free delivery available on all small parcels Australia wide using tracked services of Australia Post or Fastway, no minimum order value required! Estimated delivery time is 4-9 business days. 

Express Shipping

We do also offer Express Shipping for a small additional fee on parts, accessories and apparel orders. Estimated delivery time on Express Shipping is 1 to 4 business days.

Shipping of Bikes

Shipping of bikes and other bulky goods is free to 85% of residences in Australia. However, some postcodes incur a surcharge starting from $29. 

Once shipped you will be issued a consignment number which can be used to track your parcel. We use Direct Freight Express for deliveries and you can track your delivery by calling 1300 347 397 or online at www.directfreight.com.au


We’re so confident that you’ll love our extensive range of bikes, that we’ll let you ride one as your own for a full 14 days and if you don’t like it, simply e-mail us at sales@bicyclesonline.com.au and we’ll pick it up from you, free of charge! Just make sure you keep the box so it can be re-used to send it back. Click here for more information. 

All of our bicycles come with a Free Pro Build valued at $99. This means that your bicycle will be pre built by our professional mechanics. For your convenience, safety and comfort all our bikes are fully assembled prior to delivery. The bike is then packaged back into a box for secure shipment.


When your bike arrives, all you have to attach is the front wheel, the handlebar and pedals, everything else has been done – the headset has been adjusted, wheels trued, pedals and seat post greased, brakes and gears calibrated, and the tyres have been pumped up (please note upon arrival, in some cases you may need to add more air to tyres).

Most companies simply sell you the bike as it comes from the factory, which will require significant know-how to get your bike on the road. Currently we are the only Australian company providing this service, and have the 14 day test ride to back it up.

All the tools required to assemble the bike are included. 

Please note, that all bicycles whether purchased online or instore, are mechanical devices and need to be serviced regularly to ensure proper functioning. New gear and brake cables, will stretch during the initial bed-in period, and will need to be adjusted after approximately 150-300km. 

Whilst your new bicycle will have already gone through our Pro Build process, you will still need to complete some minor final assembly steps when you take your bicycle out of its box.

Please follow the video playlist below to correctly complete the setup of your new bike:


Assembly Time:

  • 10-15min - You have assembled bikes before
  • 15-25min - You are mechanically handy
  • 30-40min - Never assembled a bike and working with tools isn't your thing


Unboxing your bike:

Start by carefully opening the top flap to expose the contents. You will see the bike with plenty of protective packaging and next to the rear wheel, the saddle & seatpost, a small cardboard box where your pedals, tools, bell and reflectors are. If you ordered any other products with the bike, it is likely they were placed on the bottom of the box as well. Remove all the loose items before pulling the bike out of the box and gently placing it on the floor.

Keep the box and all the protective packaging found on the bike in case you choose to change frame sizes, upgrade/downgrade the bike, or return the bike for a full refund under the 14 Day Test Ride Policy.


How to install a quick release front wheel:



Disc Brake Setup:


How to Install Handlebars and faceplate:


How to install pedals on your bike:


Congratulations on your Purchase

This bicycle is backed by a 5 year factory warranty on the frame and full manufacturer’s warranty on parts.

Warranty is valid only for bicycle that has been properly and well-maintained under the following conditions:

Warranty includes:

  • All damaged or fractured or broken frame / fork / component which was caused by manufacturing or assembling error in factory.
  • Non functioning mechanism caused by manufacturing error in factory.

Warranty is NOT valid for:

  • Incorrect assembly, i.e pedals installed in the wrong crank arm. 
  • Normal degradation caused by frequent use, such as degrading brake shoe, deflated tire, etc
  • Surface defects, such as stained, marred, defaced, etc
  • Damaged caused by misuse or accident
  • Other damages which are not caused by factory error
  • Bicycles which have been sold to another party
  • Bicycles used in commercial capacity, such as rentals
  • Bicycles which have not been well-maintained

For any damages which is guaranteed by the brand as the first condition above, the brand will repair or replace damaged frame / fork / component with the one of the same brand or similar.

Warranty is valid for all Polygon and Marin bicycles to the original owner only, by showing the purchase invoice.  

To make a claim click here.

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