Rocky Mountain Blizzard A20

2023 MountainFat bike Manufacturer page

Rocky Mountain Blizzard A20, color Red / Blue

Last known price: $1,799

Prices shown first for United States
Suspension: Rigid
Wheels: 27.5″
Drivetrain: 1 × 12 30t / 10–51t
Gear range: 510%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 157.5–170
MD 167.5–177.5
LG 175–188
XL 185.5–198

Components

18 of 20 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

Rocky Mountain 6061 SL Series Alloy | 100mm BSA BB | Zero Stack Tapered Headtube | Internal Cable Routing | Dropper Post Compatible | 197mm Dropouts Not identified

Suspension

1 part

Fork
- Rocky Mountain

Drivetrain

6 parts

Bottom bracket
- Race Face
Cassette
- Shimano Deore CS-M6100-12 12 speeds 10–51t
CS-M6100-12
Chain
- Shimano Deore CN-M6100
CN-M6100
Crankset
- Race Face Ride 30t
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

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 450mm

Stack 608mm

Wheelbase 1198mm

Head angle 66.0°

Seat angle 74.0°

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 4 published sizes

Complete manufacturer geometry by size
Measurement
Reachmm	425	450	475	500
Stackmm	604	608	618	627
Top tube lengthmm	598	624	652	680
Seat tube lengthmm	380	420	445	480
Head tube lengthmm	105	110	120	130
Head tube angle	66°	66°	66°	66°
Seat tube angle	74°	74°	74°	74°
Chainstay lengthmm	455	455	455	455
Wheelbasemm	1171	1198	1227	1256
Front centermm	724	750	779	808
Bottom bracket dropmm	65	65	65	65
Bottom bracket heightmm	290	290	290	290
Standover heightmm	793	806	807	819
Fork rakemm	51	51	51	51
Trailmm	102	102	102	102
Stack/reach ratio	1.42	1.35	1.30	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: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 30
Largest chainring: 30
Rear sprockets: 12
Smallest sprocket: 10
Largest sprocket: 51
Lowest gear: 16.2 in
Highest gear: 82.5 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: BSA
Tire width: 4.5″
Travel: Front: Additional specification: Not available: Yes
Rear: Additional specification: Not available: Yes
Wheel material: Aluminum
Wheel size: 27.5″

Gearing

Estimated speeds at 80 rpm

Lowest gear: 6.2 km/h
Highest gear: 31.6 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: 16.2–82.5 gear inches

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 2023 builds

Differences across 2023 builds
Specification	This bicycle Rocky Mountain Blizzard A20	Rocky Mountain Blizzard A10 Shimano	Rocky Mountain Blizzard A20 Shimano	Rocky Mountain Blizzard Alloy 10	Rocky Mountain Blizzard Alloy 20	Rocky Mountain Blizzard C30 Shimano
Frame
Frame material	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum	Carbon
Fork material	Aluminum	Aluminum	Aluminum	Aluminum	Aluminum	Carbon
Bicycle weight	Not informed	15.5 kg	15.21 kg	15.5 kg	Not informed	13.8 kg
Drivetrain
Smallest chainring	30	26	30	26	30	30
Largest chainring	30	26	30	26	30	30
Rear sprockets	12	10	12	10	12	12
Smallest sprocket	10	11	11	11	10	11
Largest sprocket	51	46	51	46	51	51
Lowest gear	16.2 in	15.5 in	16.2 in	15.5 in	15.3 in	16.2 in
Highest gear	82.5 in	65.0 in	75.0 in	65.0 in	78.0 in	75.0 in
Brakes
Brake type	Hydraulic disc	Mechanical disc	Hydraulic disc	Mechanical disc	Mechanical disc	Hydraulic disc
Cockpit
Derailleur hanger	Not informed	Not informed	Not informed	Not informed	Not informed	UDH
Other specifications
Tire width	4.5″	4.5″	4.5″	4.5″	4.6″	4.5″
Wheel size	27.5″	27.5″	27.5″	27.5″	26″	27.5″