Finding a capable full-suspension mountain bike on a tight budget used to mean making big compromises. When I started searching for my first trail bike, my must-have list was long: a modern 1× drivetrain, adjustable air suspension, a dropper post, hydraulic disc brakes and progressive geometry. In this Worth It episode I unbox and take the 2022 Polygon Siskiu D6 on its maiden ride to see if a sub-$2,000 bike can really tick all those boxes. Spoiler: it impressed me.

• 1× drivetrain. The D6 is specced with a Shimano Deore 1×10 groupset and a wide-range 11–46 T cassette. A clutch mech keeps the chain tight over rough terrain and the single ring reduces maintenance. The wide gearing made climbs manageable without needing a front derailleur.
• Dropper post from factory. The long 170 mm dropper allowed me to slam the saddle ondescents and still get my optimal seat height for climbing. Dropper posts use an internal cableand a handlebar lever so you can change saddle height on the fly[2].
• Adjustable air suspension. Both the SR Suntour XCR 32 fork and the X-Fusion shock use airsprings. Air-sprung forks are lighter than coil and let you tune the spring rate by simplyadjusting the air pressure[1]. With 120 mm of travel front and rear, the D6 felt like a“Goldilocks” setup—enough to handle rowdy sections while remaining lively on climbs. Itweaked the pressure by 20 psi between runs and noticed a marked improvement in control.
• Hydraulic disc brakes and trail cockpit. Shimano hydraulic brakes with large rotorsprovided consistent stopping power. A short stem and wide bars put me in a confident positionfor steering and control.
• Future-proof frame. The aluminium frame includes a 148 mm boost rear axle, tapered headtube and internal cable routing. Tubeless-ready rims mean you can ditch tubes and run lowerpressures for better traction and comfort while reducing the risk of pinch flats[3].

Polygon calls the D6 a “down-country” bike because it sits between cross-country and trail. The67° head tube angle balances agility and stability, while the steep 76° seat tube angle keeps youcentred over the pedals. The reach on our size L test bike is 465 mm—long enough for stabilitybut not so long that it feels unwieldy. Riders between 5′5″ and 5′9″ can choose between 27.5″and 29″ wheels in the medium size; sizes S–M use 27.5″ wheels while M–XL get 29″ for roll-overconfidence.

On my first loop at Mount Cotton I was pleasantly surprised by how efficiently the D6 climbed.Despite its ~15.5 kg weight, the steep seat angle and efficient suspension design preventedexcessive pedal bob. Dropping into the blue trails revealed a playful yet planted feel—thesuspension soaked up small hits while the geometry encouraged me to pump and pop offrollers. After experimenting with air pressures I found a sweet spot that smoothed out thechunky sections without feeling wallowy.

If you’re upgrading from a hardtail or buying your first dual-suspension bike, the Siskiu D6 hitsthe sweet spot. It excels on green and blue singletrack where efficiency and control are key.Riders who prioritise value and future upgrade potential will appreciate the boost spacing,tapered head tube and tubeless-ready wheels.