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Deal.ai › Polygon
Polygon
Polygon Siskiu D5 Mountain Bike

Polygon Siskiu D5 Mountain Bike

4.3(41 ratings)

Best price now

$999.99at BikesOnline USAChecked 2 h ago

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Price facts

  • Lowest price today: $999.99 at BikesOnline USA (checked Nov 11, 2026).

Our take on the Polygon Siskiu D5 Mountain Bike

The Polygon Siskiu D5 is an entry-level full-suspension mountain bike with an aluminum frame, a 9-speed drivetrain and hydraulic disc brakes. It is built for riders who want rear suspension on a budget, mainly for trail riding and light singletrack. The 9-speed setup and simpler shock keep the build affordable, but it trails pricier trail bikes on gear range and suspension tuning. Owners rate it well as a first full-suspension bike, while more experienced riders note the limits of the entry-level parts.

Best forFirst-time full-suspension buyersTrail and light singletrack ridingRiders on a tight budgetCasual weekend mountain bikers
Pros
  • Full suspension at an entry-level tier
  • Aluminum frame keeps weight reasonable
  • Hydraulic disc brakes give strong, consistent stopping
  • 9-speed drivetrain is simple and easy to maintain
  • Good platform for upgrading parts over time
Cons
  • 9-speed gearing has a narrow range for steep climbs
  • Entry-level shock and fork limit hard trail use
  • Heavier than higher-tier trail bikes
  • Fewer gears than most rivals at this level

Polygon Siskiu D5 Mountain Bike prices at every store

  • BikesOnline USANew

    Availability unknown

    $999.99Checked 2 h ago
    Visit BikesOnline USA

Polygon Siskiu D5 Mountain Bike price history

Lowest price we've seen: $999.99 on Nov 11 at BikesOnline USA. Tracked across 1 store since Nov 11.

What reviewers say

  • 4.3 / 541 ratings

Owners rate the Siskiu D5 around 4.3 out of 5 and generally see it as a solid first full-suspension bike. They praise the value of getting rear suspension and hydraulic brakes at this level, while some find the 9-speed gearing and stock suspension limiting on tougher trails.

What people mention
  • SuspensionMixedRiders like having rear suspension at this level but say the stock shock and fork feel basic on rough trails.
  • BrakesPraisedOwners report the hydraulic disc brakes stop strongly and feel consistent.
  • GearingCriticisedThe 9-speed drivetrain is seen as short on range for steep or long climbs.
  • ValuePraisedBuyers see it as an affordable way into a full-suspension trail bike.
  • WeightMixedSome riders find it heavier than expected on climbs and longer rides.

About the Polygon Siskiu D5 Mountain Bike

The Polygon Siskiu D5 is a full suspension mountain bike with an aluminum frame. It has a 9-speed drivetrain for changing gears on varied terrain.

The bike is fitted with hydraulic brakes.

Brand
Polygon
Suspension
Full suspension
Frame material
Aluminum
Brakes
Hydraulic
Speeds
9-speed

Specifications

Suspension Type
Full Suspension
Frame Material
Aluminum
With Hydraulic Brake
Yes
Number Of Speeds
9 speed

Questions and answers

Is the Siskiu D5 a good first full-suspension bike?
Yes, for riders moving up from a hardtail who want rear suspension without spending much. Its simple 9-speed drivetrain and hydraulic brakes are easy to live with. Expect basic suspension performance rather than race-ready tuning.
How does it compare with the Siskiu D7?
The D7 steps up to a wider-range drivetrain and better suspension components. The D5 keeps costs down with 9 speeds and simpler parts. Choose the D5 for light trail use and the D7 if you plan harder riding.
Is 9 speeds enough for climbing?
It works for moderate trails, but the narrow range makes steep or sustained climbs harder. Riders in hilly areas often want a wider cassette or a 1x11 or 1x12 setup.
What kind of riding is it built for?
It suits trail riding, light singletrack and fire roads. The full suspension and hydraulic brakes handle bumps and descents better than a hardtail. It is not built for downhill or jump lines.
Can the suspension be adjusted for rider weight?
The rear shock and fork allow basic spring or air pressure and rebound adjustment depending on the spec. Set sag for your weight before riding. Heavier riders may find the stock tune limited.
Does it come with pedals?
Most builds ship with basic flat pedals, though many owners swap them for grippier ones. Check the listing for the exact included parts. A helmet and basic tools are not included.
Where is the Polygon Siskiu D5 Mountain Bike cheapest?
At BikesOnline USA, for $999.99, as of our latest check.
What do buyers say about the Polygon Siskiu D5 Mountain Bike?
Rated 4.3 out of 5 from 41 ratings.

Stores we've priced the Polygon Siskiu D5 Mountain Bike at

  • BikesOnline USA deals and prices

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