One wheel of difference, a metre of turning circle
The defining difference is mechanical honesty: a three-wheel truck's single rear drive wheel sits on the steering axis, so the truck pivots almost around itself. A four-wheel truck steers with front or rear wheels while all four stay planted, and its turning circle is meaningfully larger. Everything else in the comparison — stability, speed confidence, load span, tire cost — follows from that geometry.
Where three wheels win
- Cramped indoors. Busy backrooms, cross-dock lanes and old buildings where the aisle is the constraint, not the load.
- Light, short-duty work. Pallets under the light-counterbalance classes, short moves, smooth floors.
- Truck-to-rack shuttles. Dock to nearby staging where the route turns twice per move.
Where four wheels win
- Stability at speed and on ramps. Four contact patches hold the truck through turns and dock-plate transitions; the three-wheel pivot is a compromise at pace.
- Long or wide loads. Load span and weight distribution suit the four-point stance, which matters as pallets grow.
- Heavier classes. The capacity range where the Granvolt EP line plays — 1,800 to 3,000 kg at a 500 mm load center — is four-wheel territory; the platform simply carries more.
- Rougher aprons. Yard edges, worn slabs and dock approaches forgive four tires before three.
| Factor | 3-wheel electric | 4-wheel electric (Granvolt EP line) |
|---|---|---|
| Turning circle | Dramatically tighter — the pivot geometry | Larger; plan aisles per the truck figures |
| Capacity classes | Light counterbalance | 1,800–3,000 kg @ 500 mm across EP18 / EP25 / EP30 |
| Stability at speed / ramps | Compromised | Four contact patches |
| Best site | Cramped light indoor duty | Manufacturing, logistics centers, multi-shift warehouses |
Granvolt's position, stated honestly
We build four-wheel electric counterbalance trucks — the EP18, EP25 and EP30 on one 80 V lithium platform — because the buyers we serve run manufacturing and logistics duty where stability, capacity and multi-shift endurance outweigh the turning circle. We do not currently list a three-wheel model, and we say so in the RFQ process rather than pretend otherwise: for the cramped light-duty niche, a three-wheel specialist may genuinely fit better, and for the narrow-aisle racking case our answer is not a three-wheel truck but the ST20 straddle stacker, which buys aisle width a different way — the geometry explained in the aisle-width guide.
Deciding without a showroom
Two measurements settle most of it: your tightest working aisle (face to face, at its worst point) and your heaviest pallet with its load center. If the aisle comfortably exceeds the four-wheel truck's requirement and the weight sits in the EP classes, the four-wheel platform is the durable answer — and its opportunity charging keeps it available across shifts. If the aisle genuinely cannot take the circle, no amount of capacity justification fixes geometry: choose the narrower tool for that zone, exactly as the dock-to-aisle solution matches trucks to zones rather than forcing one truck everywhere.
Running the comparison on your own floor
The comparison finishes on your concrete, not on a page. Mark your worst aisle and your tightest turn; walk the heaviest pallet’s route end to end; then test the candidate trucks on exactly that course, with that pallet. The three-wheel truck will show you its pivot advantage in the first turn; the four-wheel will show you its stability advantage on the first dock plate. Both demonstrations are honest, and both cost an afternoon. What the test adds that no specification can is your operators’ read — they will feel the truck that fits the building, and their buy-in on the final choice is worth more than the turning-circle figure that started the debate.
Where the EP line’s platform tips it
One more consideration lands on the four-wheel side for growing sites: the platform behind it. Every EP truck runs the same 80 V LiFePO4 system with opportunity charging, the same charging arithmetic, the same documentation and the same operator habits — which means a fleet of four-wheel trucks scales by adding units, while a site that mixes three-wheel specials with its core fleet pays a small tax on every addition. Platform consistency is invisible on day one and obvious by year three, when the spare covers any machine, any operator can take any truck, and the charging map has not changed since the first delivery. For sites still deciding, run the three-wheel test on the worst aisle — and if the four-wheel passes that test too, let the platform decide the rest.
Frequently asked questions
Why do 3-wheel forklifts turn tighter?
Their single rear drive wheel sits on the steering axis, so the truck pivots nearly around itself. Four-wheel trucks steer while all wheels stay planted, which costs turning circle and buys stability.
Does Granvolt make a 3-wheel forklift?
No — the EP line is four-wheel electric counterbalance from 1,800 to 3,000 kg. The gap is stated honestly in our RFQ process.
What should I use in very narrow aisles?
Match the tool to the zone: a straddle stacker such as the ST20 buys racking access in narrow aisles, while light three-wheel trucks suit cramped floor-level duty.
Are 4-wheel trucks more stable?
Yes, at speed, on ramps and with longer loads — four contact patches versus a pivot. That stability is a large part of why heavier classes are four-wheel.
Which Granvolt truck suits a busy warehouse?
The EP line covers dock-to-rack counterbalance duty on one 80 V lithium platform; the ST series covers dock lanes and narrow aisles. See the warehousing solution for the set.