Centurion Backfire R800i EQ

2025 MountainCross-country Electric bicycle Manufacturer page

Fork travel: 100 mm
Wheels: 29″
Drivetrain: 1 × 11 34t / 11–50t
Gear range: 455%
Battery: 750 Wh
Weight: 25.8 kg 56.9 lb · Reference configuration not specified
Frame: Aluminum
Brakes: Hydraulic disc

Rider height by size (cm)

Size guide

SM 158–171
MD 168–180
LG 178–189
XL 186–199

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 R intube II, Material: Aluminium, 29", Steuerrohr: 1.5" - 1.8" tapered, Ausfallende: 12x148mm, Bremsaufnahme: Postmount 180mm, UDH Schaltauge, Rahmenkennung: TBP058A Not identified

Electric system

3 parts

Suspension

1 part

Fork
- SR Suntour

Drivetrain

5 parts

Cassette
- Shimano CS-LG400-11 11 speeds 11–50t
CS-LG400-11
Chain
- Shimano CN-LG500
CN-LG500
Crankset
- Centurion
CK-790
Rear derailleur
- Shimano Cues RD-U6000 11 speeds
RD-U6000
Shifters
- Shimano Cues
RD-U6000

Brakes

2 parts

Brake levers
- Shimano BL-MT501
BL-MT501
Brakes
- Shimano BR-MT520
BR-MT520

Wheels and tires

5 parts

Front hub
- Shimano HB-TC500-15-B
HB-TC500-15FH-TC500-HM
Rear hub
- Shimano FH-TC500-HM-B 11 speeds
FH-TC500-HMHB-TC500-15
Rims
- Procraft
Spokes
- Procraft
Tires
- Maxxis Rekon

Cockpit and contact points

5 parts

Other components

4 parts

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Geometry diagram unavailable

The drawing needs reach and stack, which the manufacturer did not publish. Available facts remain in the table.

Size Reported by the manufacturer

Complete manufacturer geometry table 4 published sizes

Complete manufacturer geometry by size
Measurement
Top tube lengthmm	607	633	663	694
Seat tube lengthmm	400	450	500	550
Head tube lengthmm	105	125	145	165
Head tube angle	67.5°	67.5°	67.5°	67.5°
Seat tube angle	74°	74°	74°	74°
Chainstay lengthmm	460	460	460	460
Wheelbasemm	1164	1191	1223	1257
Front centermm	712	739	771	805
Bottom bracket dropmm	68	68	68	68
Bottom bracket heightmm	306	306	306	306
Standover heightmm	750	781	814	856

Not published by the manufacturer: Reach, Stack, Fork rake, Trail, Stack/reach ratio, 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: 25.8 kg

56.9 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: 11
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

Derailleur hanger: UDH
Seatpost: Rigid seatpost
Shifting: Mechanical

Electric system

Battery capacity: 750 Wh

Additional specifications

Battery: BOSCH PowerTube 750Wh; Größe S: 625Wh, entnehmbar, horizontal
Fork spring: Air
Tire width: 2.4″
Wheel material: Aluminum
Wheel size: 29″

Technical analysis

2 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: 2025
Sample: 1,508 bicycles with this information
Coverage: 87.8% of the class

Shifting

Mechanical

222 of 1,648 bicycles with this information use electronic shifting.

Cohort: Mountain / Cross-country Model year: 2025
Sample: 1,648 bicycles with this information
Coverage: 95.9% 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

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 2025 builds
Specification	This bicycle Centurion Backfire R800i EQ	Centurion Backfire E R860i	Centurion Backfire E R860i EQ	Centurion Backfire Fit E R750i	Centurion Backfire Fit E R750i EQ	Centurion Backfire Fit E R760i
Frame
Bicycle weight	25.8 kg	22.5 kg	24 kg	21.6 kg	23.1 kg	22.2 kg
Drivetrain
Smallest chainring	34	34	34	36	36	36
Largest chainring	34	34	34	36	36	36
Rear sprockets	11	12	12	10	10	10
Largest sprocket	50	50	50	42	42	42
Lowest gear	19.7 in	19.7 in	19.7 in	24.9 in	24.9 in	24.9 in
Highest gear	89.6 in	89.6 in	89.6 in	94.9 in	94.9 in	94.9 in
Cockpit
Derailleur hanger	UDH	Not informed	Not informed	Not informed	Not informed	Not informed
Electric bicycle systems
Battery capacity	750 Wh	625 Wh	625 Wh	500 Wh	500 Wh	625 Wh
Other specifications
Tire width	2.4″	2.4″	2.4″	2.25″	2.25″	2.25″
Wheel size	29″	29″	29″	27.5″ / 29″	27.5″ / 29″	29″