Polygon Siskiu T8

2026 MountainEnduro Manufacturer page

Polygon Siskiu T8, color Radiant Purple - Black

Last known price: $2,199

Prices shown first for United States
Travel: 150 / 135 mm Fork / rear shock
Wheels: 27.5″, 29″
Drivetrain: 1 × 12 32t / 11–51t
Gear range: 464%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 155–166
MD 164–176
MD 164–176
LG 174–186
XL 184–195

Components

16 of 23 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

12 SPEED 11-51T Not identified
Chain
- KMC
Crankset
- Shimano FC-MT510-1 12 speeds 32t
FC-MT510MT-510
Rear derailleur
- Shimano SLX RD-M7100-SGS 12 speeds
RD-M7100-SGS
Shifters
- Shimano SLX SL-M7100-R 12 speeds
SL-M7100

Brakes

3 parts

Wheels and tires

4 parts

Front hub
- Shimano HB-TC500-15-B
HB-TC500-15
Rear hub
- Shimano FH-MT400-B
FH-MT400
Rims

584 / 622-35 32H FOR TYRE 584 / 622-54/76 TUBELESS READY Not identified
Tires

PERFORMANCE TIRE, 27.5"X2.60"/29”X2.60" Not identified

Cockpit and contact points

7 parts

Grips

LINC Rubber, Black, 134 mm Length, Ø25 mm Not identified
Handlebar
- Entity
Headset

ZERO STACK (ZS) SEALED BEARING FOR TAPER HEAD TUBE, ZS 44/28.6 | ZS 56/40 Not identified
Pedals

ALLOY FLAT PEDAL W / REPLACEABLE PIN & REFLECTOR Not identified
Saddle
- Entity
Seatpost
- Tranz-X
Stem
- Polygon

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 460mm

Stack 608mm

Wheelbase 1194mm

Head angle 65.5°

Seat angle 76.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ wheel; exact published values are in the table below.

Size Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	440	460	460	480	500
Stackmm	593.5	607.1	607.6	621.2	634.9
Top tube lengthmm	582.5	605.7	605.9	629.1	652.4
Seat tube lengthmm	385	400	400	415	430
Head tube lengthmm	105	120	90	105	120
Head tube angle	65°	65°	65.5°	65.5°	65.5°
Seat tube angle	76.5°	76.5°	76.5°	76.5°	76.5°
Chainstay lengthmm	425	425	430	430	430
Wheelbasemm	1172.8	1199.1	1193.5	1219.7	1245.9
Front centermm	749	775	766	792	819
Bottom bracket dropmm	20	20	39	39	39
Bottom bracket heightmm	335	335	335	335	335
Standover heightmm	666.6	672.5	676.6	686.2	695.9
Fork rakemm	37	37	42	42	42
Trailmm	125	125	125	125	125
Stack/reach ratio	1.35	1.32	1.32	1.29	1.27
Suspension and parts
Front travelmm	140	140	140	140	140
Rear travelmm	135	135	135	135	135
Crank lengthmm	165	165	165	165	165
Handlebar widthmm	780	780	780	780	780
Stem lengthmm	35	35	35	35	35
Dropper post travelmm	150	150	150	170	170

Not published by the manufacturer: Stem angle and Seatpost length.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Full suspension
Front travel: 150 mm
Rear travel: 135 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 32
Largest chainring: 32
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 51
Lowest gear: 18.2 in
Highest gear: 84.4 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Derailleur hanger: UDH
Seatpost: Dropper seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BSA
Fork spring: Air
Tire clearance: Maximum tire width: 2.6″
Tire width: 2.6″
Wheel material: Aluminum
Wheel size: 27.5″, 29″

Technical analysis

3 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: 2026
Sample: 1,332 bicycles with this information
Coverage: 95.2% of the class

Rear travel

135 mm

This value is below the central range for this class.

Cohort: Mountain / Enduro Model year: 2026
Sample: 1,005 bicycles with this information
Coverage: 71.8% of the class

Shifting

Mechanical

454 of 1,399 bicycles with this information use electronic shifting.

Cohort: Mountain / Enduro Model year: 2026
Sample: 1,399 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.0 km/h
Highest gear: 32.3 km/h

Total gear range 464%

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: 18.2–84.4 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 2026 builds
Specification	This bicycle Polygon Siskiu T8	Polygon Siskiu D24	Polygon Siskiu D5	Polygon Siskiu D6	Polygon Siskiu D6 LTD	Polygon Siskiu D7
Suspension
Front travel	150 mm	120 mm	120 mm	120 mm	120 mm	120 mm
Rear travel	135 mm	120 mm	120 mm	120 mm	120 mm	Not informed
Drivetrain
Smallest chainring	32	30	32	32	24	32
Largest chainring	32	30	32	32	24	32
Rear sprockets	12	8	9	10	10	11
Smallest sprocket	11	12	11	11	11	11
Largest sprocket	51	42	46	48	48	50
Lowest gear	18.2 in	17.1 in	19.1 in	19.3 in	13.8 in	18.6 in
Highest gear	84.4 in	60.0 in	80.0 in	84.4 in	60.0 in	84.4 in
Cockpit
Derailleur hanger	UDH	Not informed	Not informed	Not informed	Not informed	Not informed
Seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Bottom bracket standard	BSA	Not informed	BSA	BSA	BSA	BSA
Fork spring	Air	Air	Coil	Coil	Air	Air
Tire clearance	Maximum tire width: 2.6″	Maximum tire width: 2.5″	Maximum tire width: 2.25″	Not informed	Maximum tire width: 2.4″	Not informed
Tire width	2.6″	2.4″	2.25″	2.25″	2.25″	2.25″
Wheel size	27.5″ / 29″	24″	27.5″	27.5″ / 29″	27.5″	27.5″ / 29″