What Does Forklift Tread Width Mean?

A forklift specification sheet may list:

Tread, Front - b10
Tread, Rear - b11

These figures are easy to ignore because buyers usually pay more attention to rated capacity, wheelbase and turning radius.

But tread width describes another part of the forklift's chassis geometry.

In simple terms, it is the transverse spacing between the left and right wheel positions on the same axle.

Front tread and rear tread may be different because the drive axle and steering axle perform different jobs.

Industry specification sheets normally list them separately.

For example, Hyster publishes:

Front Tread - b10
Rear Tread - b11

as two different chassis dimensions.

Konecranes technical data also distinguishes:

Front Width
Front Tread
Rear Width
Rear Tread

which shows that tread and total vehicle width are not the same measurement.

This is the most important distinction for buyers.

Suppose a forklift specification lists:

Front tread: 1,850 mm

That does not mean the forklift itself is only 1,850 mm wide.

The tires, hubs, fenders or other components extend beyond the tread measurement.

If the forklift needs to pass through a factory door or narrow working area, the figure to check is the truck's overall width, not its tread width.

This is similar to the way forklift wheelbase describes the distance between the front and rear axle areas but does not tell you the truck's total length.

On a conventional counterbalance forklift, the front and rear axles have different functions.

The front axle normally:

• Drives the truck
• Carries a large share of the loaded weight
• Supports the mast and load side of the machine
• The rear axle normally provides steering.

Because the axle design, tire size and loading are different, there is no reason the front and rear tread measurements must be identical.

This becomes even more obvious on heavy duty forklifts using dual front tires.

Large-capacity forklifts may have:

four front tires + two rear tires.

A technical sheet can still provide one front-tread dimension for the axle.

For example, Hyster's 7–9 ton electric range lists four front wheels together with a front tread of 1,847 mm and rear tread of 1,536 mm.

For buyers, the practical lesson is:

Do not try to calculate tread width from the outside edges of the tires.

Use the manufacturer's published dimension for the actual wheel configuration.

We explain the reason for using dual front tires on heavy duty forklifts separately.

Tread width is related to the transverse geometry of the truck, so it is one factor in vehicle design.

But a buyer should not compare two forklifts and conclude:

"This truck has a wider tread, so it must be safer or able to lift more."

Forklift stability also depends on:

• Center of gravity
• Wheelbase
• Load position
• Lift height
• Tire configuration
• Chassis design
• Steering-axle arrangement

The basic relationship between the support points and center of gravity is covered in our forklift stability triangle article.

Tread width should therefore be treated as one chassis dimension, not a standalone capacity rating.

Often it affects the overall chassis layout, but not in a simple one-to-one relationship.

Hyster technical data provides a useful example: the same series can have different tread configurations while the overall width is listed separately.

Tire width, rims, hubs and body structure all affect final machine width.

So if the customer has a strict doorway limit, we would ask for:

maximum allowable overall width

rather than:

maximum tread width.

For most standard purchases, buyers do not need to choose a tread dimension themselves.

It becomes more relevant when:

• Comparing detailed technical specifications
• Checking a customized chassis
• Reviewing dual-wheel configurations
• Working with strict site-width limits
• Preparing a tender with required chassis dimensions
• Comparing different tire or axle arrangements

For high-capacity projects, tread should be checked together with overall width, wheelbase, tire layout and turning radius.

The current Propolift heavy duty forklift range covers different chassis sizes from 10 to 52 tons, so these dimensions naturally change with capacity and application.

If a customer tells us:

"My aisle is 3 meters wide."

the tread width alone is not enough to judge whether the forklift can work there.

We would rather know:

• Doorway width
• Actual aisle width
• Turning space
• Load dimensions
• Required travel direction

Then we can compare those site dimensions with the truck's overall width and turning geometry.

Tread width remains useful technical data, but it is not usually the dimension that determines whether the truck physically fits through an entrance.

Forklift tread width describes the transverse spacing of the wheel positions on an axle.

Specification sheets normally identify:

b10 - Front Tread
b11 - Rear Tread

It should not be confused with overall vehicle width.

For buyers, the main rule is simple:

Use tread width to understand chassis and wheel geometry.
Use overall width to check physical clearance.

And when comparing stability or capacity, do not judge the forklift from tread width alone.

The complete truck design matters.

References

1. Hyster - E45–70XN2 Technical Guide: Front and Rear Tread Dimensions.
2. Hyster - J7.0–9.0XNL Technical Guide: Tread, Overall Width and Wheel Configuration.
3. Konecranes - High Standard Lift Trucks Technical Data: Front Width, Front Tread, Rear Width and Rear Tread.
4. Propolift - Heavy Duty Forklift Product Range.