Polygon Siskiu T8

2021 MountainTrail Manufacturer page

Last known price: $2,599

Prices shown first for United States
Travel: 150 / 140 mm Fork / rear shock
Wheels: 27.5″, 29″
Drivetrain: 1 × 12 32t / 10–51t
Gear range: 510%
Weight: 15.2 kg 33.5 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 152.5–165
MD 162.5–175
MD 162.5–175
LG 172.5–185
XL 182.5–195

Components

12 of 16 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

ALX TRAIL FRAME 140MM TRAVEL (27.5”) / 135MM TRAVEL (29”), TAPER H/T Not identified

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket

BSA THREADED Not identified
Cassette
- Shimano SLX CS-M7100-12 12 speeds 10–51t
CS-M7100-12
Chain
- KMC
Crankset
- Shimano FC-MT510-1 12 speeds 32t
FC-MT510
Rear derailleur
- Shimano SLX RD-M7100 12 speeds
RD-M7100
Shifters
- Shimano SLX SL-M7100-R 12 speeds
SL-M7100

Brakes

1 part

Brakes
- Tektro HD-M745
HD-M745

Wheels and tires

2 parts

Rims
- Entity
Tires

PERFORMANCE TIRE, 27.5”X2.40” / 29”X2.40” Not identified

Cockpit and contact points

5 parts

Handlebar
- Entity
Pedals

None
Saddle
- Entity
Seatpost

DROPEPR POST 150mm (S & M) / 170mm (L & XL) Not identified
Stem
- Entity

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
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

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
Bicycle weight: 15.2 kg

33.5 lb

Suspension

Suspension configuration: Full suspension
Front travel: 150 mm
Rear travel: 140 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: 18.2 in
Highest gear: 92.8 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
Fork spring: Air
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 27.5″, 29″

Technical analysis

4 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 above the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,325 bicycles with this information
Coverage: 98.1% of the class

Lowest gear

18.2 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,138 bicycles with this information
Coverage: 84.2% of the class

Highest gear

92.8 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,138 bicycles with this information
Coverage: 84.2% of the class

Shifting

Mechanical

53 of 1,347 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,347 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.0 km/h
Highest gear: 35.5 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: 18.2–92.8 gear inches
Class reference (p10–p90): 16.9–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2021
Lowest gear: 1138 bicycles with this information, 84.2% of the class
Highest gear: 1138 bicycles with this information, 84.2% of the class

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 2021 builds
Specification	This bicycle Polygon Siskiu T8	Polygon Siskiu D24	Polygon Siskiu D24X	Polygon Siskiu D5	Polygon Siskiu D7	Polygon Siskiu N7
Frame
Bicycle weight	15.2 kg	13.79 kg	13.61 kg	17.03 kg	16.35 kg	16.8 kg
Suspension
Front travel	150 mm	120 mm	120 mm	100 mm	120 mm	160 mm
Rear travel	140 mm	120 mm	120 mm	120 mm	120 mm	160 mm
Drivetrain
Smallest chainring	32	30	32	36	32	32
Largest chainring	32	30	32	36	32	32
Rear sprockets	12	8	10	9	11	12
Smallest sprocket	10	12	11	11	11	10
Largest sprocket	51	42	46	36	51	51
Lowest gear	18.2 in	17.1 in	16.7 in	27.5 in	18.2 in	18.2 in
Highest gear	92.8 in	60.0 in	69.8 in	90.0 in	84.4 in	92.8 in
Brakes
Brake type	Hydraulic disc	Mechanical disc	Hydraulic disc	Hydraulic disc	Hydraulic disc	Hydraulic disc
Cockpit
Seatpost	Dropper seatpost	Rigid seatpost	Dropper seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Bottom bracket standard	BSA	BSA	BSA	Not informed	Not informed	BSA
Fork spring	Air	Air	Air	Coil	Not informed	Air
Tire width	2.4″	2.4″	2.4″	2.25″	2.25″	2.6″
Wheel size	27.5″ / 29″	24″	24″	27.5″	27.5″ / 29″	27.5″ / 29″