Clearance is a system number, not a truck number.
Direct answer: Forklift clearance is a system number, not a truck number. It is the truck's right-angle stacking dimension plus load length plus a working clearance, then reduced by rack depth, column projections and pallet overhang in that specific building. Typical results start near 3.5–4.0 m for counterbalance trucks, 2.7–3.2 m for reach trucks and under 2.0 m for VNA, but two sites with the same truck can legitimately differ; always confirm against the exact model’s data sheet and a measured floor plan.
From truck data to aisle width
Counterbalance trucks need the widest aisles; reach trucks shrink them substantially; turret and VNA trucks work in aisles measured in centimetres but usually demand guidance rails and flatter floors.
Measure the building, not the brochure: column positions, rack depth, and the load overhang all subtract from the nominal aisle figure.
Minimum aisle width by truck type (planning starting points)
| Truck type | Typical aisle width | What usually drives the final number |
|---|---|---|
| Counterbalance, 4-wheel | 3.5–4.0 m | Right-angle stacking dimension of the largest truck in the fleet |
| Counterbalance, 3-wheel | 3.2–3.5 m | Tighter turning circle, but load length still dominates |
| Reach truck | 2.7–3.2 m | Mast reach stroke plus load depth; leg-to-leg clearance |
| Turret / very narrow aisle (VNA) | 1.6–2.0 m | Rail guidance, floor flatness (usually ≤3 mm/m over the rail run) and mast sway |
| Pedestrian stacker | 2.0–2.5 m | Blind corners and pedestrian segregation, not the machine |
FAQ
Do I still need rack protectors in narrow aisles?
Yes, and arguably more so. End-of-aisle uprights take the most strikes; column guards and rub rails are cheap relative to an upright replacement.
How much clearance behind a pallet is enough?
A common planning allowance leaves several centimetres between load and the next rack face; ask your racking supplier to confirm figures for your specific pallet type.
Can aisle widths change after installation?
Changing truck type usually means changing racking geometry, beam levels and protection layout. Treat it as a redesign, not a reshuffle.
All figures above refer to standard product data sheets; final confirmation is subject to written quotation.