Polygon Siskiu T27 EVO

2027 MountainEnduro Manufacturer page

Last known price: $1,999

Prices shown first for United States
Fork travel: 150 mm
Wheels: 27.5″
Drivetrain: 1 × 12 32t / 10–51t
Gear range: 510%
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

The manufacturer did not publish rider heights for these sizes.

Components

17 of 22 identified

Parts found in a manufacturer catalog show their brand, model and key numbers, and the steps show how precisely they are identified: brand, series, model, or the exact product. The info button has every detail and the text the manufacturer published.

Frame and fork

1 part

Frame

aluminum Not identified

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket
- Shimano
Cassette
- Shimano Deore CS-M6100-12 12 speeds 10–51t
CS-M6100-12
Chain
- KMC
X-12
Crankset
- Shimano Deore FC-M6120-1 12 speeds 32t
FC-M6120
Rear derailleur
- Shimano Deore RD-M6100-SGS 12 speeds
RD-M6100-SGS
Shifters
- Shimano Deore SL-M6100 12 speeds
SL-M6100

Brakes

3 parts

Wheels and tires

5 parts

Front hub
- Shimano HB-TC500-15-B
HB-TC500-15FH-TC500-MS
Rear hub
- Shimano FH-TC500-MS-B 12 speeds
FH-TC500-MSHB-TC500-15
Rims

ALLOY DOUBLE WALL H: 18mm W: 29mm 584-27.5 32H FOR TYRE 584-54/76 TL READY Not identified
Spokes

F: STAINLESS J-BEND 27.5" NDS:274 / DS:276, R: STAINLESS J-BEND 27.5" NDS:274 / DS:272 Not identified
Tires
- Maxxis Dissector

Cockpit and contact points

5 parts

Handlebar
- Polygon
Headset
- FSA NO.57E
Pedals

ALLOY FLAT PEDAL W/ REPLACEABLE PIN & REFLECTOR Not identified
Saddle
- Fizik Terra Alpaca X5
Seatpost

DROPPER POST XFUSION MANIC LC 100mm TRAVEL, DxL: 30.9 x 314mm Not identified

Sizes and geometry

1 size Open in the geometry plotter

Complete rider-height ranges are not published for these sizes. You can still explore the geometry below.

Size XS

Table

Reach 420mm

Stack 580mm

Wheelbase 1146mm

Head angle 65.0°

Seat angle 76.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 27.5″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 1 published size

Complete manufacturer geometry by size
Measurement
Reachmm	420
Stackmm	579.87
Top tube lengthmm	559.2
Seat tube lengthmm	375
Head tube lengthmm	90
Head tube angle	65°
Seat tube angle	76.5°
Chainstay lengthmm	425
Wheelbasemm	1146.4
Front centermm	722
Bottom bracket dropmm	20
Bottom bracket heightmm	335
Standover heightmm	666
Fork rakemm	37
Trailmm	125
Stack/reach ratio	1.38

Not published by the manufacturer: Front travel, Rear travel, Crank length, Handlebar width, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Full suspension
Front travel: 150 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 17.3 in
Highest gear: 88.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

2 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

150 mm

This value is below the central range for this class.

Cohort: Mountain / Enduro Model year: 2027
Sample: 230 bicycles with this information
Coverage: 97.8% of the class

Shifting

Mechanical

86 of 235 bicycles with this information use electronic shifting.

Cohort: Mountain / Enduro Model year: 2027
Sample: 235 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.6 km/h
Highest gear: 33.7 km/h

Total gear range 510%

Technical details and class reference

These speeds describe the gearing at the selected cadence, not how fast you can ride.
Calculated from published gear-inch values and their wheel-size assumptions.
These gearing values describe the bicycle, not a selected frame size.
A 100% range means one ratio; 500% means the highest ratio is five times the lowest.
For e-bikes, motor assistance cutoff is not represented.

Gear-inch range

Lower gear-inch values travel less distance per pedal revolution; higher values travel farther.

This bicycle: 17.3–88.0 gear inches

Lineup changes

The published facts that differ across this family's builds and from the same model a year earlier. Missing information never counts as zero.

Differences across 2027 builds
Specification	This bicycle Polygon Siskiu T27 EVO	Polygon Siskiu D24	Polygon Siskiu D24 EVO
Suspension
Front travel	150 mm	120 mm	120 mm
Drivetrain
Smallest chainring	32	30	32
Largest chainring	32	30	32
Rear sprockets	12	8	10
Smallest sprocket	10	12	11
Largest sprocket	51	42	48
Lowest gear	17.3 in	17.1 in	16.0 in
Highest gear	88.0 in	60.0 in	69.8 in
Cockpit
Seatpost	Dropper seatpost	Rigid seatpost	Dropper seatpost
Other specifications
Bottom bracket standard	BSA	Not informed	Not informed
Wheel size	27.5″	24″	24″
Fork spring	Not informed	Air	Air

Changes since 2026
Specification	2026 Polygon Siskiu T27 EVO	This bicycle Polygon Siskiu T27 EVO
Suspension
Rear travel	140 mm	Not informed
Drivetrain
Smallest chainring	34	32
Largest chainring	34	32
Lowest gear	18.3 in	17.3 in
Highest gear	93.5 in	88.0 in
Other specifications
Fork spring	Air	Not informed
Tire clearance	Maximum tire width: 2.6″	Not informed