Over the past year I’ve spent countless hours riding and testing Polygon’s Siskiu T7 and T8 trailbikes. Both are hugely popular thanks to their progressive geometry, size-specific wheel optionsand wallet-friendly prices—but riders often ask which one offers the best value. In thiscomparison I’ll break down the similarities and differences between the T7 and T8, coveringframe geometry, suspension, drivetrain, brakes and ride feel. By the end you’ll know which bikesuits your riding style and budget.

Polygon uses the same alloy chassis across the T7 and T8, which means you get size-specificwheel options (27.5-inch wheels on small and medium, 29-inch wheels on medium through XL)and identical geometry. That geometry is impressively progressive for the price point with aslack head angle around 65.5°, a steep seat angle around 76.5° and short chainstays. The resultis a bike that’s stable at speed but still agile in tight terrain. Reach numbers stretch fromaround 440 mm (size S) to 500 mm (size XL), giving plenty of room to move. On both modelsyou’ll also find internal cable routing and a long-stroke dropper post for getting the saddle outof the way on descents[4].

Where the two bikes diverge is in the build kit. The Siskiu T7 uses RockShox suspension with aDeluxe Select Plus rear shock and a Recon fork. This combo performs admirably on flow trailsand moderate technical terrain, though the Recon’s 32 mm stanchions can feel flexy whenyou’re charging rougher lines. The T8 steps up to a Fox DPS shock and a Fox 34 Rhythm forkwith 34 mm stanchions and more sophisticated damping. You can also add volume spacers totune the air spring to your preference, giving the T8 a more controlled feel when the trails getrough. Both bikes run air-sprung suspension that’s easily adjusted for rider weight[2] and canaccept volume spacers in the rear shock to fine-tune the spring curve.In terms of drivetrain, the T7 comes with a wide-range Shimano Deore drivetrain—either 10- or11-speed depending on the market. It’s durable and shifts well but has fewer ratios than the T8’s12-speed Shimano SLX drivetrain. The T8’s extra gears make climbing easier and provide finercadence control on rolling terrain. Both bikes roll on Entity rims wrapped in grippy tyres andare tubeless ready out of the box[3].

Both bikes use Tektro Orion brakes with four-piston calipers on the front wheel for maximumstopping power. At the rear the T7 uses a two-piston brake while the T8 adds a four-piston rearbrake for extra power on steep descents. The brake levers feature reach adjustment so riderscan dial the lever position for comfort and control[1]. Polygon spec’s the same finishing kit onboth bikes: a 780 mm bar, short stem and soft grips. A long-travel dropper post comes standard,allowing you to quickly lower the saddle when the trail turns downhill[4].

On the trail the two bikes feel remarkably similar thanks to their shared chassis and geometry.The T7’s RockShox suspension is plush and responsive on smoother tracks, but its narrowerstanchions mean it flexes more when you’re ploughing through chunky rock gardens. The T8’sFox 34 fork feels noticeably stiffer and delivers better support on big hits, making it the betterchoice for aggressive riders or heavier riders. The extra gears on the T8 also help maintain anefficient cadence on long climbs. That said, both bikes climb well and descend with confidencethanks to the slack head angle and steep seat angle.

If you’re just getting into trail riding or you’re on a tight budget, the Siskiu T7 is an incrediblevalue. Its modern geometry, air-sprung suspension[2] and tubeless-ready wheels[3] make ittrail-ready out of the box, and you can always upgrade components later as your skills improve.However, if you have the extra budget and want a bike that’s ready for rougher terrain, theSiskiu T8’s stiffer Fox fork, higher-end drivetrain and stronger rear brake make it worth theupgrade. Either way you’re getting a trail bike that punches well above its price.