Centurion Backfire Fit E R850i EQ

2021 MountainCross-country Electric bicycle Manufacturer page

Fork travel: 100 mm
Wheels: 27.5″, 29″
Drivetrain: 1 × 12 34t / 11–50t
Gear range: 455%
Battery: 500 Wh
Weight: 22.8 kg 50.3 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

25 of 26 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

Backfire Fit R intube, Material: Aluminium, Steuerrohr: 1.5" straight, Ausfallende: 12x148 mm, Bremsaufnahme: Postmount 180 mm Not identified

Electric system

3 parts

Suspension

1 part

Fork
- SR Suntour RAIDON34

Drivetrain

6 parts

Brakes

2 parts

Wheels and tires

5 parts

Cockpit and contact points

5 parts

Other components

3 parts

Sizes and geometry

5 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 410mm

Stack 665mm

Wheelbase 1129mm

Head angle 70.0°

Seat angle 73.5°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 29″ 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	370	390	410	430	450
Stackmm	624	645	665	685	705
Top tube lengthmm	555	581	607	633	659
Seat tube lengthmm	380	430	480	530	580
Head tube lengthmm	130	110	130	150	170
Head tube angle	68.5°	69.75°	70°	70.25°	70.5°
Seat tube angle	73.5°	73.5°	73.5°	73.5°	73.5°
Chainstay lengthmm	445	460	460	460	460
Wheelbasemm	1086	1105	1129	1153	1177
Front centermm	646	654	677	701	725
Bottom bracket dropmm	50	68	68	68	68
Bottom bracket heightmm	305	306	306	306	306
Standover heightmm	726	756	782	809	840
Fork rakemm	44	44	44	44	44
Trailmm	93	91	89	88	86
Stack/reach ratio	1.69	1.65	1.62	1.59	1.57

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: 22.8 kg

50.3 lb
Weight limit: 150 kg

330.7 lb

Suspension

Suspension configuration: Hardtail
Front travel: 100 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: 19.7 in
Highest gear: 89.6 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Electric system

Battery capacity: 500 Wh

Additional specifications

Battery: BOSCH PowerTube 500 Wh
Fork spring: Air
Tire width: 2.25″
Wheel material: Aluminum
Wheel size: 27.5″, 29″

Technical analysis

4 measures

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

Front travel

100 mm

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,256 bicycles with this information
Coverage: 91.6% of the class

Lowest gear

19.7 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,101 bicycles with this information
Coverage: 80.3% of the class

Highest gear

89.6 gear inches

This value is within the central range for this class.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,101 bicycles with this information
Coverage: 80.3% of the class

Shifting

Mechanical

89 of 1,368 bicycles with this information use electronic shifting.

Cohort: Mountain / Cross-country Model year: 2021
Sample: 1,368 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 7.6 km/h
Highest gear: 34.3 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: 19.7–89.6 gear inches
Class reference (p10–p90): 17.4–100.2 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Mountain / Cross-country Model year: 2021
Lowest gear: 1101 bicycles with this information, 80.3% of the class
Highest gear: 1101 bicycles with this information, 80.3% 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 2021 builds

Differences across 2021 builds
Specification	This bicycle Centurion Backfire Fit E R850i EQ	Centurion Backfire E R2600i	Centurion Backfire Fit E R760i	Centurion Backfire Fit E R811i EQ	Centurion Backfire Fit E R850i
Frame
Bicycle weight	22.8 kg	22.6 kg	22.2 kg	26.4 kg	21.3 kg
Suspension
Front travel	100 mm	110 mm	100 mm	100 mm	100 mm
Drivetrain
Smallest chainring	34	34	36	34	34
Largest chainring	34	34	36	34	34
Rear sprockets	12	12	10	12	12
Smallest sprocket	11	10	11	11	11
Largest sprocket	50	51	42	50	50
Lowest gear	19.7 in	19.3 in	24.9 in	19.7 in	19.7 in
Highest gear	89.6 in	98.6 in	94.9 in	89.6 in	89.6 in
Cockpit
Seatpost	Rigid seatpost	Dropper seatpost	Rigid seatpost	Rigid seatpost	Rigid seatpost
Electric bicycle systems
Battery capacity	500 Wh	625 Wh	625 Wh	625 Wh	500 Wh
Other specifications
Tire width	2.25″	2.4″	2.25″	2.25″	2.25″
Wheel size	27.5″ / 29″	29″	29″	29″	27.5″ / 29″