Polygon Siskiu Range: What do the Letters Mean?


Polygon has a great range of aluminium full-suspension bikes that cover all the mountain bike niches, and they are named with a letter and a number. So, you may be wondering which one do I need and what do the letters mean?

The letters can quickly be broken down into; D = XC riding, T= Trail riding, N = Enduro riding. Simple, now you can either go and buy the bike that fits how you want to ride and your budget, or you can read on and find out a little bit more.

D is for cross-country riding

If you like wearing lycra, keeping your wheels on the ground, and riding very fast around laps that don’t feature huge drops, then an XC bike is the one for you and Polygon have their Siskiu D range just for you.


The D5 and the D7 are alloy XC bikes that feature 120mm of travel, which is at the more trail end of XC riding. You’ll then be able to race at the weekends and go for a session at the local trail centre on a weekday with your friends, just remember if you want to hit the bike park of the big drops, there are more capable bikes in the Siskiu range.

The D5 comes with a Suntour shock and fork, the Raidon LO-R and the XCM HLO. These are both great entry-level products, and if you step up to the D7, you’ll move up onto a RockShox 30 Silver Solo fork, and a Suntour Unair LO-R shock. The RockShox will bring you a much more tunable fork and this will your riding experience a lot more fun.



The D5 comes with a 27 speed Shimano Alivio groupset, and 27 gears seems like a great idea, especially as with the D7 you get 20 gears provided by a Shimano Deore XT / Deore mix. You’ll get the same range though with the 20 gears, and your gear changes will be a little snappier plus the clutch derailleur keeps the chain line in check over rougher trail sections. The smoother gear changes on the D7 become more and more important when racing XC.

The final main difference is that you’ll save around a kilogram of weight on the D7 over the D5. The lighter weight will make you faster, and will also make climbs seem like less of a problem.

T is for trail riding

If you like going out with your friends, hitting a few drops, sending a few drops, and then having a beer, you probably want to look at the Polygon Siskiu T range. These bikes are designed for taking on gnarlier terrain than the D series, and they positively want you to take them through the air.

Both the Polygon Siskiu T7 and T8 come in 650b and 29er wheels sizes. You’ll find 150mm of travel on the 650b wheel size, and 140mm on the 29er. Both are also Boost models to allow you to have stiff and strong wheels on your trail ready beast.


Suspension wise on the T7 you’ll find a Rockshox Recon RL Solo fork and an X-Fusion O2 Pro,  a great partnership that will have you flying down the trails. On the T8 though you’ll find the new and improved RockShow Revelation RC Debon Air fork. When RockShox changed the Revelation to 35mm stanchions, they created a fork that works well outside of its price point. The Revelation is partnered to a Rockshox Deluxe RT3 rear shock with great ground tracking.

The T8 even has 1 more gear than you’ll find on the T7. Both bikes come with the modern 1x setup. The T7 comes with a 10 speed Shimano Deore XT/Deore mix, and the T8 comes with a Shimano Deore XT/SLX mix.



Both bikes, as you’d expect at this price point, come with Shimano hydraulic brakes. The T7 features M365 brakes, and the T8 comes with MT-500 brakes. Both sets of brakes will work well, but you’ll notice a little bit more bite on the MT-500 brakes.

The T8 as you can probably imagine comes with a lighter weight than the T7, as the wheels, frame, and dropper post are the same, it comes down to the lighter suspension and groupset to make the difference.

N is for enduro

Do you like wearing goggles over an XC helmet? Do you like going downhill as fast as humanly possible, but still like to ride your bike back up the hill? Then the Polygon Siskiu N is the bike for you. These bikes are designed for when you want gravity to help assist your progress down a hill at eye-watering speeds. 


Like the T series, the N series comes in both a 29er and 650b version. The 29er comes with 160mm of travel, and the 650b version comes 170mm of travel — more than enough to see off any drops and road gaps that come your way. The N series is again a Boost setup, and both come with an internally routed dropper post.


The suspension is again where you’ll find the big differences and weight savings between the 2 models. The N8 comes with a Rockshox Yari RC Debon Air fork and a Fox Performance Float DPX2 E2 rear shock. The rear shock stays the same on the N9, but you move up to a bang on trendy Fox 36 Rhythm. The 36mm stanchions bring you a front end that doesn’t allow any flex.



Both bikes come with a 1x12 groupset, and both use an SRAM Eagle variant to bring you that massive 50t rear cog. On the N8 you’ll find NX Eagle, and on the N9 you’ll get GX Eagle. The main difference here is that GX rear derailleur is a little smoother thanks to steel pins and bushings being added to its construction.

Braking wise you’ll get a set of Tektro Orion hydraulic disc brakes on the N8. The N9 jumps up to the 4 pistons TRP Slate hydraulic discs. The 4 piston brake will give you better bite on your rotors, for those days when your fully on it and leaving braking till the last minute.

Check out these popular Dual-Suspension Bikes!

2019 Polygon Siskiu D5 Dual Suspension Mountain Bike

2019 Polygon Siskiu D7 Dual Suspension Mountain Bike

2019 Polygon Siskiu T7 Dual Suspension Mountain Bike

2019 Polygon Siskiu T8 Dual Suspension Mountain Bike

2019 Polygon Siskiu N8 Dual Suspension Mountain Bike

2019 Polygon Siskiu N9 Dual Suspension Mountain Bike


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