Transition Sentinel Alloy Eagle 90

Name: Transition Sentinel Alloy Eagle 90
Brand: Transition

2025 MountainEnduro Manufacturer page

Last known price: $4,799

Prices shown first for United States
Travel: 160 / 150 mm Fork / rear shock
Wheels: 27.5″, 29″
Drivetrain: 1 × 12 30t / 10–52t
Gear range: 520%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 143–160
SM 154–170
MD 164–182
LG 175–190
XL 184–200
XXL 190–207

Components

18 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

Sentinel Alloy 150mm Not identified

Suspension

2 parts

Drivetrain

7 parts

Bottom bracket

73mm BSA Threaded Not identified
Cassette
- SRAM XS-1275 Eagle Transmission 12 speeds 10–52t
XS-1275
Chain
- SRAM GX Eagle Transmission Flattop 12 speeds
Chain guide

ISCG05 Not identified
Crankset
- SRAM 30t
Rear derailleur
- SRAM Eagle AXS S500 12 speeds
Shifters
- SRAM

Brakes

2 parts

Wheels and tires

5 parts

Cockpit and contact points

6 parts

Grips
- ODI
Handlebar

ANVL Mandrel Alloy 35, XS/SM (800x20mm), MD/LG/XL (800x30mm), XXL (800x40mm) Not identified
Headset
- FSA NO.57E
Saddle
- SDG Bel-Air
Seatpost
- OneUp
Stem

ANVL Swage (40mm) Not identified

Sizes and geometry

6 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 455mm

Stack 621mm

Wheelbase 1237mm

Head angle 64.0°

Seat angle 77.9°

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 6 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	415	430	455	480	505	530
Stackmm	592	615	621	633	642	651
Top tube lengthmm	534	557	586	614	642	670
Seat tube lengthmm	360	360	390	430	460	490
Head tube lengthmm	100	100	110	120	130	140
Head tube angle	64°	64°	64°	64°	64°	64°
Seat tube angle	79.2°	78.7°	77.9°	77.3°	76.8°	76.5°
Chainstay lengthmm	434	442	442	446	446	446
Wheelbasemm	1171	1208	1237	1271	1300	1330
Front centermm	737	767	796	826	855	885
Bottom bracket dropmm	15	25	25	25	25	25
Bottom bracket heightmm	340	350	350	350	350	350
Fork rakemm	37	44	45	44	44	44
Trailmm	132	134	133	134	134	134
Stack/reach ratio	1.43	1.43	1.37	1.32	1.27	1.23

Not published by the manufacturer: Standover height, 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: 160 mm
Rear travel: 150 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 52
Lowest gear: 16.7 in
Highest gear: 87.0 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: 2.5″
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

160 mm

This value is within the central range for this class.

Cohort: Mountain / Enduro Model year: 2025
Sample: 1,419 bicycles with this information
Coverage: 97.5% of the class

Rear travel

150 mm

This value is within the central range for this class.

Cohort: Mountain / Enduro Model year: 2025
Sample: 1,106 bicycles with this information
Coverage: 76.0% of the class

Shifting

Mechanical

477 of 1,455 bicycles with this information use electronic shifting.

Cohort: Mountain / Enduro Model year: 2025
Sample: 1,455 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.4 km/h
Highest gear: 33.3 km/h

Total gear range 520%

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: 16.7–87.0 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 2025 builds

Differences across 2025 builds
Specification	This bicycle Transition Sentinel Alloy Eagle 90	Transition Sentinel Alloy Deore	Transition Sentinel Alloy XT	Transition Sentinel Carbon Deore	Transition Sentinel Carbon Eagle 90	Transition Sentinel Carbon XO AXS
Frame
Frame material	Aluminum	Aluminum	Aluminum	Carbon	Carbon	Carbon
Bicycle weight	Not informed	16.51 kg	15.58 kg	15.21 kg	Not informed	15.07 kg
Drivetrain
Largest sprocket	52	51	51	51	52	52
Lowest gear	16.7 in	17.1 in	17.1 in	17.1 in	16.7 in	16.7 in
Cockpit
Shifting	Mechanical	Mechanical	Mechanical	Mechanical	Mechanical	Electronic
Derailleur hanger	Not informed	Not informed	Not informed	Not informed	Not informed	UDH
Other specifications
Fork spring	Not informed	Not informed	Not informed	Air	Air	Air