Norco Aurum A1

2021 MountainDownhill Manufacturer page

Norco Aurum A1, color Blood Red / Candy Apple Red

Last known price: $2,999

Prices shown first for United States
Fork travel: 200 mm
Wheels: 27.5″
Drivetrain: 1 × 10 36t / 11–28t
Gear range: 255%
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 154.9–166
MD 163–175
LG 172–184
XL 181–191.8

Components

21 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

Aurum A 7.1 Not identified

Suspension

2 parts

Drivetrain

8 parts

Bottom bracket
- Race Face
Cassette
- SRAM PG-1030 10 speeds 11–28t
PG-1030
Chain
- KMC X10 10 speeds
Chain guide
- e*thirteen
Chain tensioner
- e*thirteen
Crankset
- Race Face 36t
Rear derailleur
- Shimano ZEE RD-M640
RD-M640
Shifters
- Shimano ZEE SL-M640
SL-M640

Brakes

1 part

Brakes
- SRAM

Wheels and tires

4 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 413mm

Stack 611mm

Wheelbase 1211mm

Head angle 63.0°

Seat angle 75.5°

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 4 published sizes

Complete manufacturer geometry by size
Measurement
Frame
Reachmm	393	413	432	452
Stackmm	602	611	620	629
Top tube lengthmm	539	571	603	635
Seat tube lengthmm	400	420	440	460
Head tube lengthmm	100	110	120	130
Head tube angle	63°	63°	63°	63°
Seat tube angle	76.4°	75.5°	74.6°	73.8°
Chainstay lengthmm	425	435	445	455
Wheelbasemm	1177	1211	1254	1280
Front centermm	752	776	809	825
Bottom bracket dropmm	12	12	12	12
Bottom bracket heightmm	343	343	343	343
Standover heightmm	682	688	695	704
Fork rakemm	52	52	52	52
Trailmm	123	123	123	123
Stack/reach ratio	1.53	1.48	1.44	1.39
Suspension and parts
Crank lengthmm	165	165	165	165
Stem lengthmm	50	50	50	50

Not published by the manufacturer: Front travel, Rear travel, Handlebar width, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum

Suspension

Suspension configuration: Full suspension
Front travel: 200 mm

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 36
Largest chainring: 36
Rear sprockets: 10
Smallest sprocket: 11
Largest sprocket: 28
Lowest gear: 35.4 in
Highest gear: 90.0 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: 2.5″
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

200 mm

This value is within the central range for this class.

Cohort: Mountain / Downhill Model year: 2021
Sample: 106 bicycles with this information
Coverage: 98.1% of the class

Lowest gear

35.4 gear inches

This value is below the central range for this class.

Cohort: Mountain / Downhill Model year: 2021
Sample: 97 bicycles with this information
Coverage: 89.8% of the class

Highest gear

90.0 gear inches

This value is within the central range for this class.

Cohort: Mountain / Downhill Model year: 2021
Sample: 97 bicycles with this information
Coverage: 89.8% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 13.5 km/h
Highest gear: 34.5 km/h

Total gear range 255%

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: 35.4–90.0 gear inches
Class reference (p10–p90): 30.9–103.9 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Downhill Model year: 2021
Lowest gear: 97 bicycles with this information, 89.8% of the class
Highest gear: 97 bicycles with this information, 89.8% 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 Norco Aurum A1	Norco Aurum HSP C1 27.5	Norco Aurum HSP C1 29	Norco Aurum HSP C2 27.5	Norco Aurum HSP C2 29
Frame
Frame material	Aluminum	Carbon	Carbon	Carbon	Carbon
Suspension
Front travel	200 mm	Not informed	Not informed	200 mm	200 mm
Drivetrain
Smallest chainring	36	34	34	34	34
Largest chainring	36	34	34	34	34
Rear sprockets	10	7	7	7	7
Smallest sprocket	11	10	10	11	11
Largest sprocket	28	24	24	25	25
Lowest gear	35.4 in	39.0 in	41.1 in	37.4 in	39.4 in
Highest gear	90.0 in	93.5 in	98.6 in	85.0 in	89.6 in
Other specifications
Fork spring	Air	Air	Air	Not informed	Not informed
Wheel size	27.5″	27.5″	29″	27.5″	29″
Rear shock spring	Not informed	Coil	Coil	Coil	Coil