Rocky Mountain Thunderbolt 770

2014 MountainTrail

Last known price: $3,999

Prices shown first for United States
Travel: 120 / 120 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 2 × 10 24–38t / 11–36t
Gear range: 518%
Weight: 12.79 kg 28.2 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

XS 156–166
SM 163–174
MD 171–182
LG 179–189
XL 185–195

Components

22 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

FORM™ Alloy Custom Hydroformed Frame ABC™ Pivots Tapered Head Tube Press Fit BB Internal Cable Routing Internal \"Stealth\" Dropper Post Routing Not identified

Suspension

2 parts

Drivetrain

7 parts

Brakes

2 parts

Wheels and tires

5 parts

Cockpit and contact points

6 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 426mm

Stack 591mm

Wheelbase 1124mm

Head angle 68.5°

Seat angle 74.5°

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 Reported by the manufacturer

Complete manufacturer geometry table 5 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	381	404	426	449	475
Stackmm	573	582	591	601	615
Top tube lengthmm	540	565	590	615	645
Seat tube lengthmm	381	419	457	483	521
Head tube lengthmm	100	110	120	130	145
Head tube angle	68.5°	68.5°	68.5°	68.5°	68.5°
Seat tube angle	74.5°	74.5°	74.5°	74.5°	74.5°
Chainstay lengthmm	426	426	426	426	426
Wheelbasemm	1072	1098	1124	1150	1181
Front centermm	647	673	699	725	756
Bottom bracket dropmm	20	20	20	20	20
Bottom bracket heightmm	331	331	331	331	331
Standover heightmm	715	715	715	715	715
Fork rakemm	44	44	44	43	43
Trailmm	93	93	93	94	94
Stack/reach ratio	1.50	1.44	1.39	1.34	1.30

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: 12.79 kg

28.2 lb

Suspension

Suspension configuration: Full suspension
Front travel: 120 mm
Rear travel: 120 mm

Drivetrain

Derived by Bikelake

Front chainrings: 2
Smallest chainring: 24
Largest chainring: 38
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 18.3 in
Highest gear: 95.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Fork spring: Air
Tire width: 2.2″
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

120 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2014
Sample: 123 bicycles with this information
Coverage: 94.6% of the class

Rear travel

120 mm

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2014
Sample: 93 bicycles with this information
Coverage: 71.5% of the class

Lowest gear

18.3 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2014
Sample: 111 bicycles with this information
Coverage: 85.3% of the class

Highest gear

95.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2014
Sample: 111 bicycles with this information
Coverage: 85.3% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.0 km/h
Highest gear: 36.4 km/h

Total gear range 518%

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: 18.3–95.0 gear inches
Class reference (p10–p90): 16.8–110.0 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2014
Lowest gear: 111 bicycles with this information, 85.3% of the class
Highest gear: 111 bicycles with this information, 85.3% 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 2014 builds

Differences across 2014 builds
Specification	This bicycle Rocky Mountain Thunderbolt 770	Rocky Mountain Thunderbolt 710	Rocky Mountain Thunderbolt 730	Rocky Mountain Thunderbolt 750
Frame
Bicycle weight	12.79 kg	14.1 kg	13.42 kg	13.34 kg
Drivetrain
Front chainrings	2	3	3	3
Smallest chainring	24	22	24	24
Largest chainring	38	44	42	42
Lowest gear	18.3 in	16.8 in	18.3 in	18.3 in
Highest gear	95.0 in	110.0 in	105.0 in	105.0 in
Other specifications
Bottom bracket standard	Not informed	Not informed	BB86/BB92	Not informed