Rocky Mountain Thunderbolt Alloy 30

Name: Rocky Mountain Thunderbolt Alloy 30
Brand: Rocky Mountain

2021 MountainTrail

Last known price: $2,599

Prices shown first for United States
Travel: 150 / 140 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 1 × 12 34t / 10–51t
Gear range: 510%
Weight: 14.84 kg 32.7 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

XS Steep
XS Slack
SM Steep
SM Slack
MD Steep
MD Slack
LG Steep
LG Slack
XL Steep
XL Slack

The manufacturer did not publish rider heights for these sizes.

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 BB92. Internal Cable Routing. 2-Bolt ISCG05 Tabs. RIDE-9™ Adjustable Geometry + Suspension Rate FORM™ Alloy Rear Triangle Not identified

RIDE-9

Suspension

2 parts

Drivetrain

6 parts

Bottom bracket
- Shimano BB-MT500
BB-MT500
Cassette
- Shimano Deore CS-M6100-12 12 speeds 10–51t
CS-M6100-12
Chain
- Shimano Deore CN-M6100
CN-M6100
Crankset
- Shimano Deore FC-M6100 12 speeds 34t
FC-M6100
Rear derailleur
- Shimano Deore RD-M6100 12 speeds
RD-M6100
Shifters
- Shimano Deore SL-M6100 12 speeds
SL-M6100

Brakes

1 part

Brakes
- Shimano

Wheels and tires

5 parts

Cockpit and contact points

6 parts

Sizes and geometry

10 sizes Open in the geometry plotter

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

Size MD Steep

Table

Reach 442mm

Stack 593mm

Wheelbase 1160mm

Head angle 67.1°

Seat angle 75.1°

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 10 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	392	380	419	408	442	430	464	453	491	479
Stackmm	575	583	584	593	593	602	603	611	616	626
Top tube lengthmm	545	548	575	578	600	603	625	628	655	658
Seat tube lengthmm	356	356	394	394	432	432	471	471	509	509
Head tube lengthmm	100	100	110	110	120	120	130	130	145	145
Head tube angle	67.1°	65.9°	67.1°	65.9°	67.1°	65.9°	67.1°	65.9°	67.1°	65.9°
Seat tube angle	75.1°	73.9°	75.1°	73.9°	75.1°	73.9°	75.1°	73.9°	75.1°	73.9°
Chainstay lengthmm	424	426	424	426	424	426	424	426	424	426
Wheelbasemm	1102	1104	1134	1136	1160	1162	1186	1189	1219	1221
Front centermm	678	679	710	711	736	737	762	764	795	796
Bottom bracket dropmm	10	24	10	24	10	24	10	24	10	24
Bottom bracket heightmm	345	331	345	331	345	331	345	331	345	331
Standover heightmm	804	799	804	799	804	799	804	799	804	799
Fork rakemm	44	44	45	44	44	44	44	44	44	43
Trailmm	102	111	101	111	102	111	102	111	102	112
Stack/reach ratio	1.47	1.53	1.39	1.45	1.34	1.40	1.30	1.35	1.26	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
Bicycle weight: 14.84 kg

32.7 lb

Suspension

Suspension configuration: Full suspension
Front travel: 150 mm
Rear travel: 140 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 34
Largest chainring: 34
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 18.3 in
Highest gear: 93.5 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: BB86/BB92
Fork spring: Air
Tire width: 2.5″
Wheel material: Aluminum
Wheel size: 27.5″

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: 1,324 bicycles with this information
Coverage: 98.1% of the class

Lowest gear

18.3 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,137 bicycles with this information
Coverage: 84.2% of the class

Highest gear

93.5 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,137 bicycles with this information
Coverage: 84.2% of the class

Shifting

Mechanical

53 of 1,346 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2021
Sample: 1,346 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.0 km/h
Highest gear: 35.8 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: 18.3–93.5 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: 1137 bicycles with this information, 84.2% of the class
Highest gear: 1137 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 Rocky Mountain Thunderbolt Alloy 30	Rocky Mountain Thunderbolt Alloy 10
Frame
Bicycle weight	14.84 kg	15.1 kg
Drivetrain
Smallest chainring	34	32
Largest chainring	34	32
Rear sprockets	12	11
Smallest sprocket	10	11
Lowest gear	18.3 in	17.3 in
Highest gear	93.5 in	80.0 in
Other specifications
Tire width	2.5″	2.4″

Changes since 2020
Specification	2020 Rocky Mountain Thunderbolt Alloy 30	This bicycle Rocky Mountain Thunderbolt Alloy 30
Frame
Bicycle weight	14.2 kg	14.84 kg
Suspension
Front travel	140 mm	150 mm
Drivetrain
Smallest sprocket	11	10
Largest sprocket	50	51
Lowest gear	17.7 in	18.3 in
Highest gear	80.4 in	93.5 in
Other specifications
Tire width	2.4″	2.5″
Wheel size	27.5″ / 26″	27.5″
Fork spring	Not informed	Air