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2019 Polygon Siskiu N9 29 Bike (discontinued)

Average User Rating: (Spectacular)
Polygon Siskiu N9
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Need more info? View our Enduro / All-Mountain Mountain Bikes buyer's guide.

Exceptional value in a full suspension Enduro style bike

High end components list.

Rating: Featured Member Review
Exceptional value in a full suspension Enduro style bike
The Good:

Components. Solid construction. Exceptional value.

The Bad:

The Eagle GX can be tricky to dial in.

Overall Review:

The term "game-changer" gets thrown around pretty loosely these days. Having said that, this bike has been a game-changer for me! Coming from an XC\Light trail bike from GIANT, I was looking for an Enduro style set up that I could grow into as my skills improved. I took literally months reading and watching reviews. With a firm grasp on what to look for in bike geometry, components and build quality, the search began for the best value. I narrowed things down to 3 companies. Polygon became the clear winner. Other bikes with comparable components were pushing over$1000 more! Out of my range.

The bike:

My medium frame 29er weights in at roughly 32 pounds. Impressively (to me) the same as my XC bike so, no penalty for me to have full suspension. At 5 foot 7 inches tall, I realized how poorly sized my XC bike is for me. The medium N9 fits perfectly with everything comfortably in reach. The bike just feels right. The Fox suspension, once dialed in for the rider, adds a level of stability and confidence that I had only read about. The local gnarly trail that had me creeping down the steep Rocky and rooty drops was now seeing me attack with speed and confidence. The suspension soaks up the hits while keeping the tires planted. The 4 piston brakes work well. I honestly don't notice them, they just work and I don't think about them. I guess that is a good thing. 

My only complaint so far would be that the Eagle GX can, initially, be tricky to dial in. Getting the right spacing on the Eagle gear is usually the culprit.

In general, this bike has changed the way I ride and encourages me to push harder on the trails. There are certainly other bikes with slicker rear suspension linkage and uber cool frame set ups and materials but, for the money, the N9 is a real winner in this price point.

I highly recommend it if you are looking to get into an Enduro rig that can handle serious downhills and climb right back up with minimal fuss.


Product Polygon Siskiu N9 29 Bike
Model Year 2019
Riding Type Enduro / All-Mountain
Rider Unisex
Sizes and Geometry
M, L, XL View Geometry
Size M L XL
Top Tube Length 600.1 624.4 656.2
Head Tube Angle 65.5° 65.5° 65.5°
Head Tube Length 90 102 115
Seat Tube Angle 75° 75° 75°
Seat Tube Length 430 470 520
Bottom Bracket Height 343.5 (-33 drop) 343.5 (-33 drop) 343.5 (-33 drop)
Chainstay Length 439.4 439.4 439.4
Wheelbase 1194.9 1221.1 1255.3
Standover 720 743.1 773.7
Reach 435 456.6 485
Stack 616 626.1 638.8
* Additional Info All measurements in mm unless otherwise noted.
Wheel Size 29"
Frame Material Aluminum
Frame Material Details ALX Enduro alloy
Rear Travel 160mm
Rear Shock FOX Performance Float DPX2, 205x65mm, 3 position lever, LV EVOL, Trunnion mount
Fork FOX 36 Rhythm, Boost 15x110mm
Fork Travel 160mm
Head Tube Diameter Tapered 1.125"-1.5”
Headset ZS 44/28.6 | ZS 56/40
Handlebar Entity Xpert, alloy, 780mm length, 12mm rise, 31.8mm bore
Stem Entity Xpert, alloy, 45mm length, 7° rise, 31.8mm
Brakes TRP Slate T4, 4 piston
Brake Levers TRP Slate T4
Drivetrain 1x
Shifters SRAM GX Eagle, 12-speed
Front Derailleur None
Rear Derailleur SRAM GX Eagle, 12-speed
Chainguide None
Cranks Truvativ Descendant 6K, aluminum, DUB spindle, 170mm on M, 175mm on L/XL
Chainrings Narrow-wide, 32 tooth
Bottom Bracket SRAM DUB BSA
Pedals None
Chain SRAM GX Eagle, 12-speed
Cassette SRAM XG 1275 Eagle, 12-speed, 11-50 tooth
Rims Entity XL2 disc 29-622 wheelset
Hubs Entity XL2 disc 29-622 wheelset
Spokes Entity XL2 disc 29-622 wheelset
Tires Schwalbe Magic Marry, 29”x2.35"
Saddle Entity Assault
Seatpost EXA Form Drive SI, 125mm on M, 150mm on L/XL
Seatpost Diameter 30.9mm
Seatpost Clamp Nutted
Rear Dropout / Hub Dimensions Boost 148x12mm
Max. Tire Size
Bottle Cage Mounts NO
Colors Green/black
Warranty 5 year
Weight N/A
Miscellaneous FAUX BAR rear suspension system
Internal cable routing
Price $2,999
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