Rocky Mountain Thunderbolt 730

2015 MountainTrail

Last known price: $2,499

Prices shown first for United States
Travel: 120 / 120 mm Fork / rear shock
Wheels: 27.5″
Drivetrain: 3 × 10 24–42t / 11–36t
Gear range: 573%
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™ 7005 Series Custom Hydroformed Alloy. ABC™ Pivots. Tapered Head Tube. Press Fit BB. Not identified

Suspension

2 parts

Drivetrain

7 parts

Bottom bracket
- Shimano SM-BB71
SM-BB71
Cassette
- Shimano CS-HG50 11–36t
CS-HG50
Chain
- Shimano CN-HG54
CN-HG54
Crankset
- Shimano FC-M552 42/32/24t
FC-M552
Front derailleur
- Shimano Deore
Rear derailleur
- Shimano Deore XT
Shifters
- Shimano Deore

Brakes

2 parts

Brake levers
- Shimano BL-M506
BL-M506
Brakes
- Shimano BL-M506
BL-M506

Wheels and tires

5 parts

Cockpit and contact points

7 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 420mm

Stack 562mm

Wheelbase 1126mm

Head angle 67.2°

Seat angle 73.7°

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	376	398	420	443	469
Stackmm	544	553	562	572	586
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	67.2°	67.2°	67.2°	67.2°	67.2°
Seat tube angle	73.7°	73.7°	73.7°	73.7°	73.7°
Chainstay lengthmm	422	422	422	422	422
Wheelbasemm	1073	1100	1126	1152	1184
Front centermm	652	679	705	731	763
Bottom bracket dropmm	25.2	25.2	25.2	25.2	25.2
Bottom bracket heightmm	330	330	330	330	330
Standover heightmm	696	696	696	696	696
Fork rakemm	53	54	54	53	53
Trailmm	92	91	91	92	92
Stack/reach ratio	1.45	1.39	1.34	1.29	1.25

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
Fork material: Aluminum

Suspension

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

Drivetrain

Derived by Bikelake

Front chainrings: 3
Smallest chainring: 24
Largest chainring: 42
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 36
Lowest gear: 18.3 in
Highest gear: 105.0 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Bottom bracket standard: BB86/BB92
Fork spring: Air
Tire width: 2.25″
Wheel material: Aluminum
Wheel size: 27.5″

Technical analysis

3 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: 2015
Sample: 155 bicycles with this information
Coverage: 93.3% of the class

Lowest gear

18.3 gear inches

This value is within the central range for this class.

Cohort: Mountain / Trail Model year: 2015
Sample: 163 bicycles with this information
Coverage: 98.1% of the class

Highest gear

105.0 gear inches

This value is above the central range for this class.

Cohort: Mountain / Trail Model year: 2015
Sample: 163 bicycles with this information
Coverage: 98.1% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.0 km/h
Highest gear: 40.2 km/h

Total gear range 573%

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: 18.3–105.0 gear inches
Class reference (p10–p90): 16.8–104.4 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Trail Model year: 2015
Lowest gear: 163 bicycles with this information, 98.1% of the class
Highest gear: 163 bicycles with this information, 98.1% 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 2015 builds
Specification	This bicycle Rocky Mountain Thunderbolt 730	Rocky Mountain Thunderbolt 710	Rocky Mountain Thunderbolt 750	Rocky Mountain Thunderbolt 750 MSL	Rocky Mountain Thunderbolt 770 MSL	Rocky Mountain Thunderbolt 790 MSL BC Edition
Frame
Frame material	Aluminum	Aluminum	Aluminum	Carbon	Carbon	Carbon
Fork material	Aluminum	Aluminum	Not informed	Not informed	Not informed	Not informed
Suspension
Front travel	120 mm	120 mm	120 mm	120 mm	120 mm	130 mm
Drivetrain
Front chainrings	3	3	2	2	2	1
Smallest chainring	24	22	24	24	24	32
Largest chainring	42	44	38	38	38	32
Rear sprockets	10	10	10	10	10	11
Smallest sprocket	11	11	11	11	11	10
Largest sprocket	36	36	36	36	36	42
Lowest gear	18.3 in	16.8 in	18.3 in	18.3 in	18.3 in	21.0 in
Highest gear	105.0 in	110.0 in	95.0 in	95.0 in	95.0 in	88.0 in
Cockpit
Seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost	Dropper seatpost	Dropper seatpost	Dropper seatpost
Other specifications
Bottom bracket standard	BB86/BB92	Not informed	Not informed	Not informed	BB86/BB92	BB86/BB92
Fork spring	Air	Air	Air	Air	Air	Not informed
Tire width	2.25″	2.25″	2.25″	2.25″	2.25″	2.4″