BULLS Grinder 4

Name: BULLS Grinder 4
Brand: BULLS

2025 RoadGravel Manufacturer page

Price: Not published

Prices shown first for United States
Europe: €1,899 Last known price
Suspension: Rigid
Wheels: 700c
Drivetrain: 1 × 11 40t / 11–42t
Gear range: 382%
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

14 of 18 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

Aluminium Not identified

Suspension

1 part

Fork

Machete Carbon, internal cable routing, 12mm thru axle Not identified

Drivetrain

5 parts

Cassette
- Shimano Deore CS-M5100-11 11 speeds 11–42t
CS-M5100-11
Chain
- Shimano CN-HG601-11
CN-HG601-11
Crankset
- Shimano GRX FC-RX600 40t
FC-RX600
Rear derailleur
- Shimano GRX RD-RX812 11 speeds
RD-RX812
Shifters
- Shimano GRX ST-RX600
ST-RX600

Brakes

1 part

Brakes

Hydraulic disc brake Not identified

Wheels and tires

4 parts

Cockpit and contact points

5 parts

Other components

1 part

Lights

MonkeyLink Recharge (lighting not included in the scope of delivery) Not identified

Sizes and geometry

4 sizes Open in the geometry plotter

Enter your height to highlight matching ranges.

Size MD

Table

Reach 397mm

Stack 599mm

Wheelbase 1056mm

Head angle 71.0°

Seat angle 74.0°

Every size is drawn to the same scale, in millimeters. Explanatory schematic on an assumed 700c 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	381	397	407	424
Stackmm	575	599	626	649
Top tube lengthmm	450	470	510	550
Seat tube lengthmm	450	470	510	550
Head tube lengthmm	135	160	189	213
Head tube angle	71°	71°	71°	71°
Seat tube angle	74°	74°	74°	74°
Chainstay lengthmm	435	435	435	435
Wheelbasemm	1032	1056	1076	—
Front centermm	607	631	650	327
Bottom bracket dropmm	70	70	70	70
Bottom bracket heightmm	279	279	279	279
Fork rakemm	45	45	46	—
Trailmm	73	73	72	—
Stack/reach ratio	1.51	1.51	1.54	1.53
Suspension and parts
Handlebar widthmm	400	420	440	460

Not published by the manufacturer: Standover height, Front travel, Rear travel, Crank length, Stem length, Stem angle, Seatpost length and Dropper post travel.

Specifications

Frame and fork

Intended fit: Unisex
Frame material: Aluminum
Fork material: Carbon
Weight limit: 125 kg

275.6 lb

Suspension

Suspension configuration: Rigid

Drivetrain

Derived by Bikelake

Front chainrings: 1
Smallest chainring: 40
Largest chainring: 40
Rear sprockets: 11
Smallest sprocket: 11
Largest sprocket: 42
Lowest gear: 27.6 in
Highest gear: 105.5 in

Wheels and brakes

Wheel configuration: Same size
Brake type: Hydraulic disc

Fit and controls

Seatpost: Rigid seatpost
Shifting: Mechanical

Additional specifications

Wheel material: Aluminum
Wheel size: 700c

Technical analysis

3 measures

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

Lowest gear

27.6 gear inches

This value is above the central range for this class.

Cohort: Road / Gravel Model year: 2025
Sample: 1,536 bicycles with this information
Coverage: 76.6% of the class

Highest gear

105.5 gear inches

This value is below the central range for this class.

Cohort: Road / Gravel Model year: 2025
Sample: 1,536 bicycles with this information
Coverage: 76.6% of the class

Shifting

Mechanical

688 of 1,999 bicycles with this information use electronic shifting.

Cohort: Road / Gravel Model year: 2025
Sample: 1,999 bicycles with this information
Coverage: 99.7% of the class

Gearing

Estimated speeds at 80 rpm

Lowest gear: 10.6 km/h
Highest gear: 40.4 km/h

Total gear range 382%

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: 27.6–105.5 gear inches
Class reference (p10–p90): 22.8–126.6 gear inches; The band runs from p10 for the lowest gear to p90 for the highest gear.

Cohort: Road / Gravel Model year: 2025
Lowest gear: 1536 bicycles with this information, 76.6% of the class
Highest gear: 1536 bicycles with this information, 76.6% 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 2025 builds

Differences across 2025 builds
Specification	This bicycle BULLS Grinder 4	BULLS Grinder 1	BULLS Grinder 2	BULLS Grinder 2 Diamond	BULLS Grinder 2 Trapeze	BULLS Grinder 3
Frame
Weight limit	125 kg	125 kg	125 kg	125 kg	135 kg	125 kg
Drivetrain
Front chainrings	1	2	2	2	2	1
Smallest chainring	40	34	30	30	30	40
Largest chainring	40	46	46	46	46	40
Rear sprockets	11	8	10	10	10	11
Largest sprocket	42	34	36	36	36	42
Lowest gear	27.6 in	29.0 in	24.2 in	24.2 in	24.2 in	27.6 in
Highest gear	105.5 in	121.3 in	121.3 in	121.3 in	121.3 in	105.5 in
Brakes
Brake type	Hydraulic disc	Mechanical disc	Mechanical disc	Mechanical disc	Mechanical disc	Mechanical disc