Rocky Mountain Thunderbolt Alloy 30

Name: Rocky Mountain Thunderbolt Alloy 30
Brand: Rocky Mountain

2020 MountainTrail

Last known price: $2,599

Prices shown first for United States
Travel: 140 / 140 mm Fork / rear shock
Wheels: 27.5″, 26″
Drivetrain: 1 × 12 34t / 11–50t
Gear range: 455%
Weight: 14.2 kg 31.3 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Sizes

Size guide

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

The manufacturer did not publish rider heights for these sizes.

Components

20 of 22 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-9 Adjustable Geometry + Suspension Rate Not identified

RIDE-9

Suspension

2 parts

Drivetrain

6 parts

Brakes

2 parts

Brake levers
- Shimano BL-MT400
BL-MT400
Brakes
- Shimano BR-MT400
BR-MT400

Wheels and tires

5 parts

Cockpit and contact points

6 parts

Sizes and geometry

20 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 437mm

Stack 597mm

Wheelbase 1164mm

Head angle 66.6°

Seat angle 74.6°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 26″ wheel; exact published values are in the table below.

Size Reach Stack

Complete manufacturer geometry table 20 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	392	387	380	375	419	415	408	403	442	437	430	425	464	460	453	448	491	486	479	474
Stackmm	575	578	583	586	584	588	593	596	593	597	602	605	603	606	611	615	616	620	626	629
Top tube lengthmm	545	546	548	549	575	576	578	579	600	601	603	604	625	626	628	629	655	656	658	660
Seat tube lengthmm	356	356	356	356	394	394	394	394	432	432	432	432	471	471	471	471	509	509	509	509
Head tube lengthmm	100	100	100	100	110	110	110	110	120	120	120	120	130	130	130	130	145	145	145	145
Head tube angle	67.1°	66.6°	65.9°	65.5°	67.1°	66.6°	65.9°	65.5°	67.1°	66.6°	65.9°	65.5°	67.1°	66.6°	65.9°	65.5°	67.1°	66.6°	65.9°	65.5°
Seat tube angle	75.1°	74.6°	73.9°	73.5°	75.1°	74.6°	73.9°	73.5°	75.1°	74.6°	73.9°	73.5°	75.1°	74.6°	73.9°	73.5°	75.1°	74.6°	73.9°	73.5°
Chainstay lengthmm	424	424	426	427	424	424	426	427	424	424	426	427	424	424	426	427	424	424	426	427
Wheelbasemm	1102	1106	1104	1108	1134	1137	1136	1140	1160	1164	1162	1166	1186	1190	1189	1193	1219	1222	1221	1225
Front centermm	678	682	679	682	710	713	711	714	736	740	737	740	762	766	764	767	795	798	796	799
Bottom bracket dropmm	10	6	24	20	10	6	24	20	10	6	24	20	10	6	24	20	10	6	24	20
Bottom bracket heightmm	345	337	331	323	345	337	331	323	345	337	331	323	345	337	331	323	345	337	331	323
Standover heightmm	804	803	799	797	804	803	799	797	804	803	799	797	804	803	799	797	804	803	799	797
Fork rakemm	44	44	44	44	45	42	44	44	44	43	44	44	44	43	44	43	44	43	43	43
Trailmm	102	100	111	108	101	103	111	108	102	102	111	108	102	102	111	109	102	102	112	109
Stack/reach ratio	1.47	1.49	1.53	1.56	1.39	1.42	1.45	1.48	1.34	1.37	1.40	1.42	1.30	1.32	1.35	1.37	1.26	1.28	1.31	1.33

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: 14.2 kg

31.3 lb

Suspension

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

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 34
Largest chainring: 34
Rear sprockets: 12
Smallest sprocket: 11
Largest sprocket: 50
Lowest gear: 17.7 in
Highest gear: 80.4 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
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 27.5″, 26″

Technical analysis

4 measures

How these figures sit among bicycles of the same class and model year. Context, not a ranking.

Front travel

140 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,339 bicycles with this information
Coverage: 93.7% of the class

Lowest gear

17.7 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,217 bicycles with this information
Coverage: 85.2% of the class

Highest gear

80.4 gear inches

This value is below the central range for this class.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,217 bicycles with this information
Coverage: 85.2% of the class

Shifting

Mechanical

55 of 1,428 bicycles with this information use electronic shifting.

Cohort: Mountain / Trail Model year: 2020
Sample: 1,428 bicycles with this information
Coverage: 100.0% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.8 km/h
Highest gear: 30.8 km/h

Total gear range 455%

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: 17.7–80.4 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: 2020
Lowest gear: 1217 bicycles with this information, 85.2% of the class
Highest gear: 1217 bicycles with this information, 85.2% 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 2020 builds
Specification	This bicycle Rocky Mountain Thunderbolt Alloy 30	Rocky Mountain Thunderbolt Alloy 10	Rocky Mountain Thunderbolt Alloy 50	Rocky Mountain Thunderbolt Carbon 50	Rocky Mountain Thunderbolt Carbon 70	Rocky Mountain Thunderbolt Carbon 90
Frame
Frame material	Aluminum	Aluminum	Aluminum	Carbon	Carbon	Carbon
Bicycle weight	14.2 kg	14.46 kg	14.2 kg	13.28 kg	13 kg	12.43 kg
Drivetrain
Smallest chainring	34	32	34	34	34	34
Largest chainring	34	32	34	34	34	34
Rear sprockets	12	10	Not informed	Not informed	Not informed	12
Smallest sprocket	11	11	10	10	10	10
Largest sprocket	50	46	51	51	51	51
Lowest gear	17.7 in	18.1 in	17.3 in	17.3 in	17.3 in	17.3 in
Highest gear	80.4 in	75.6 in	88.4 in	88.4 in	88.4 in	88.4 in
Other specifications
Bottom bracket standard	BB86/BB92	Not informed	Not informed	Not informed	Not informed	BB86/BB92
Tire width	2.4″	2.25″	2.4″	2.4″	2.4″	2.4″
Fork spring	Not informed	Not informed	Air	Air	Air	Air

Changes since 2019
Specification	2019 Rocky Mountain Thunderbolt Alloy 30	This bicycle Rocky Mountain Thunderbolt Alloy 30
Frame
Bicycle weight	Not informed	14.2 kg
Suspension
Front travel	130 mm	140 mm
Drivetrain
Smallest chainring	32	34
Largest chainring	32	34
Rear sprockets	11	12
Largest sprocket	46	50
Lowest gear	18.1 in	17.7 in
Highest gear	75.6 in	80.4 in
Cockpit
Seatpost	Rigid seatpost	Dropper seatpost
Other specifications
Tire width	2.3″	2.4″
Rear travel	130 mm	140 mm