Rocky Mountain Instinct Alloy 50

2025 MountainTrail Manufacturer page

Rocky Mountain Instinct Alloy 50, color Blue / Blue

Last known price: $4,599

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%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS Steep Not informed
XS Slack Not informed
XS 156–165
SM Slack Not informed
SM 164–173
SM Steep Not informed
SM Steep Not informed
SM Slack Not informed
SM 164–173
MD Slack Not informed
MD 172–181
MD Steep Not informed
LG Steep Not informed
LG 180–189
LG Slack Not informed
XL 185–195
XL Steep Not informed
XL Slack Not informed

Components

19 of 21 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

FORM™ Alloy | Full Sealed Cartridge Bearings | Press Fit BB | Internal Cable Routing | 2-Bolt ISCG05 Tabs | RIDE-4™ Adjustable Geometry | 2 Position Axle | 140mm Travel | FORM™ Alloy Rear Triangle Not identified

RIDE-4

Suspension

2 parts

Drivetrain

6 parts

Brakes

1 part

Brakes
- Shimano

Wheels and tires

5 parts

Cockpit and contact points

6 parts

Sizes and geometry

18 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size SM

Table

Reach 430mm

Stack 572mm

Wheelbase 1198mm

Head angle 64.0°

Seat angle 77.0°

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 18 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	408	398	405	423	430	433	437	423	430	449	455	458	483	480	474	510	513	504
Stackmm	582	585	582	594	591	591	571	572	572	599	599	599	626	627	628	659	659	659
Top tube lengthmm	539	540	540	567	567	567	571	572	572	621	622	623	634	636	640	645	645	649
Seat tube lengthmm	355	355	355	365	365	365	365	365	365	410	410	410	440	440	440	470	470	470
Head tube lengthmm	100	100	100	110	110	110	100	100	100	110	110	110	125	125	125	135	135	135
Head tube angle	64.3°	63.5°	64°	63.5°	64°	64.3°	64.3°	63.5°	64°	63.5°	64°	64.3°	64.3°	64°	63.5°	64°	64.3°	63.5°
Seat tube angle	77.3°	76.5°	77°	76.5°	77°	77.3°	77.3°	76.5°	77°	76.5°	77°	77.3°	77.3°	77°	76.5°	77°	77.3°	76.5°
Chainstay lengthmm	430	430	430	430	430	430	440	440	440	440	440	440	440	440	440	440	440	440
Wheelbasemm	1148	1150	1149	1179	1178	1177	1197	1198	1198	1227	1227	1227	1258	1258	1259	1293	1293	1293
Front centermm	718	721	720	750	749	747	759	761	760	790	789	789	820	820	822	855	855	856
Bottom bracket dropmm	15	27	19	27	19	15	32	44	36	44	36	32	32	36	44	36	32	44
Bottom bracket heightmm	340	328	336	328	336	340	342	330	338	330	338	342	342	338	330	338	342	330
Standover heightmm	760	757	759	753	756	757	765	760	763	798	794	801	800	799	796	796	798	792
Fork rakemm	34	40	36	40	35	33	56	66	61	57	53	52	45	46	50	37	36	40
Trailmm	133	133	133	133	134	134	118	113	115	123	124	123	130	131	131	141	140	142
Stack/reach ratio	1.43	1.47	1.44	1.40	1.37	1.37	1.31	1.35	1.33	1.33	1.32	1.31	1.30	1.31	1.33	1.29	1.29	1.31

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
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

Fork spring: Air
Tire width: 2.5″
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: 2025
Sample: 1,808 bicycles with this information
Coverage: 97.5% of the class

Lowest gear

18.2 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,382 bicycles with this information
Coverage: 74.5% of the class

Highest gear

92.8 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,382 bicycles with this information
Coverage: 74.5% of the class

Shifting

Mechanical

387 of 1,847 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2025
Sample: 1,847 bicycles with this information
Coverage: 99.6% 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): 17.1–98.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2025
Lowest gear: 1382 bicycles with this information, 74.5% of the class
Highest gear: 1382 bicycles with this information, 74.5% 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 2025 builds
Specification	This bicycle Rocky Mountain Instinct Alloy 50	Rocky Mountain Instinct Alloy 30	Rocky Mountain Instinct Carbon 50	Rocky Mountain Instinct Carbon 70	Rocky Mountain Instinct Carbon 99
Frame
Frame material	Aluminum	Aluminum	Carbon	Carbon	Carbon
Suspension
Front travel	150 mm	150 mm	160 mm	160 mm	160 mm
Rear travel	140 mm	140 mm	145 mm	145 mm	150 mm
Drivetrain
Largest sprocket	51	51	52	52	52
Lowest gear	18.2 in	18.2 in	17.9 in	17.9 in	17.9 in
Cockpit
Shifting	Mechanical	Mechanical	Mechanical	Mechanical	Electronic
Derailleur hanger	Not informed	Not informed	Not informed	UDH	UDH
Other specifications
Fork spring	Air	Not informed	Air	Air	Air
Wheel material	Aluminum	Aluminum	Aluminum	Aluminum	Not informed
Bottom bracket standard	Not informed	Not informed	BB86/BB92	BB86/BB92	BB86/BB92
Power meter	Not informed	Not informed	Not informed	Not informed	SRAM XX Transmission Carbon \| 32T \| Power Meter \| DUB Spindle \| Crankarm Length: XS -SM = 165mm \| MD - XL = 170mm