Start from the pour, not from the brochure
Most mixer truck buying mistakes are made in the first decision: someone picks a 12 m³ drum because it is the biggest number in the brochure, then discovers the truck cannot legally carry 12 m³ on the local roads, or arrives at small sites it cannot manoeuvre into, or runs half-empty half the day because the plant does not pour that volume. The right mixer truck is the smallest machine that covers your worst day of pour volume at a profit, within the road law you actually operate under. The eight steps below follow the order we run with customers - each step kills or confirms the configuration before the next one starts.
Step 1-4: drum size, rotation, chassis, mixing quality
1. Daily volume sets the drum size. Work out your worst continuous pour window - a slab pour can pull trucks back to back for hours - and your typical delivery radius. The class guidance is simple: 6-8 m³ for small plants and short urban radii, 8-10 m³ as the workhorse for most ready-mix fleets, and 12-14 m³ only where axle-load law and site access genuinely allow it. A bigger drum that arrives half-empty costs more per cubic metre delivered.
2. Rotation speed and agitation. During transport the drum should keep the mix moving without overworking it - typical practice is around 2-4 rpm agitation on the road, stepping up for loading and discharge phases. The real test is slump retention over your longest haul: the concrete must arrive inside the slump tolerance the spec calls for, or the pour fails regardless of what the brochure says.
3. Chassis and drive configuration. The drum is only half the machine; the chassis carries the legal weight. A 6×4 chassis suits the 8-9 m³ class, and an 8×4 chassis is the usual platform when you step above 10 m³ or run in regions with generous axle-load limits. Check the local axle-load law first - it decides the maximum legal drum size, and it differs from city to city.
4. Mixing quality and concrete uniformity. The drum's internal blade geometry sets how well the concrete is re-homogenised after a haul. The number that matters is the uniformity of the discharged concrete - slump and air content held within tolerance from the first discharge to the last. That is what the load must satisfy on site, and it is worth asking the manufacturer for the discharge test procedure rather than assuming it.
| Drum size | Typical chassis | Best fit |
|---|---|---|
| 6 m³ | 6×4 or 4×2 light | Small plants, tight urban sites, short radii |
| 8 m³ | 6×4 | Workhorse class - most ready-mix fleets |
| 9 m³ | 6×4 | High-turnover plants on good roads |
| 10 m³ | 8×4 | Long-haul plants with legal axle capacity |
| 12-14 m³ | 8×4 heavy | Only where law and site access allow |
Steps 5-8: discharge, electric vs diesel, urban access, TCO
5. Feed and discharge rate. Discharge rate sets the pour time at the site, and pour time is what limits the number of trips a truck can run in a day. Yutong's 8 m³ YTZ5255GJB33E feeds at not less than 2.7 m³ per minute and discharges at not less than 0.65 m³ per minute, which keeps site turnaround predictable on a normal pour. If your sites pour by pump, match discharge to the pump's suction capacity so the pump never starves.
6. Electric versus diesel. The electric mixer truck is now a real procurement option for plants with fixed daily routes and charging access. Yutong's electric model runs a 282 kWh lithium iron phosphate battery as standard (352 kWh in the composite version), with a 280 kW rated / 430 kW peak motor, a 4-speed AMT and dual-gun DC fast charging; the drum drive runs off the same electric system, so there is no separate diesel drum engine. The trade is simple: electric wins where routes are predictable and charging exists - including low-emission city zones - and diesel still wins at remote plants with no charging point and unstructured daily runs. See the electric mixer truck page for the full spec and the new energy mixer truck range page for the wider line-up.
7. Urban delivery constraints. Before you buy, drive the route in a loaded truck of the same class - or at least check length, turning radius, bridge ratings and city access rules. Many cities restrict truck length, night-hours movement and now low-emission zones that favour electric. These constraints change the optimum configuration far more than the brochure's drum-size table.
8. TCO. Add it honestly: energy or fuel per trip, drum and chassis maintenance, tyres, insurance class, and what the machine is worth after 5-7 years. An electric truck cuts the energy line and drum-engine maintenance but carries battery capital; a diesel truck has simpler economics at remote sites. Yutong's engineering team will run two or three configurations side by side on a per-cubic-metre-delivered basis before you commit - a worked example of an electric mixer fleet is on the electric mixer city case study.
| Parameter | Electric mixer | Diesel 8 m³ (YTZ5255GJB33E) |
|---|---|---|
| Drum volume | 8 m³ class | 8 m³ (agitating volume) |
| Energy | 282 / 352 kWh LFP battery | Diesel engine |
| Drive / transmission | 280 kW rated / 430 kW peak motor, 4-speed AMT | Diesel driveline, 6×4 |
| Charging / refuelling | Dual-gun DC fast charging | Diesel tank |
| Feed / discharge rate | Per mixer spec sheet | Feed ≥2.7 m³/min, discharge ≥0.65 m³/min |
| Best fit | Fixed routes, low-emission zones, grid access | Remote plants, unstructured runs |
Frequently asked questions
What drum size concrete mixer truck do I need?
Size the drum to daily pour volume and travel time: 6-8 m³ suits small plants and short delivery radii, 8-10 m³ is the workhorse class for most ready-mix fleets, and 12-14 m³ only makes sense where axle-load law and site access allow. A bigger drum that arrives half-empty costs more per cubic metre delivered.
How fast should the drum rotate during transport?
Typical practice is agitation at around 2-4 rpm on the road, with higher speeds up to roughly 12 rpm for loading and discharge phases. The drum must hold slump within tolerance for the longest expected haul on your route.
Electric or diesel concrete mixer truck?
Electric suits plants with charging access, fixed daily routes and low-emission zones; Yutong's electric model runs a 282 kWh or 352 kWh LFP battery with a 280 kW rated / 430 kW peak motor and dual-gun DC fast charging. Diesel suits remote plants and unstructured routes. Model the daily energy cost against your route before choosing.
What discharge rate should I look for?
Discharge rate sets pour time: the 8 m³ YTZ5255GJB33E discharges at not less than 0.65 m³ per minute and feeds at not less than 2.7 m³ per minute. Faster discharge shortens site turnaround and raises the trips per truck per day.
Is a concrete mixer truck road-legal everywhere?
No. Mixer trucks are weight-limited by axle-load law in most jurisdictions, and length, turning radius and urban access rules vary by city. Check local axle-load limits, bridge ratings and low-emission-zone rules before choosing drum size - the same 10 m³ drum can be legal in one city and overweight in another.
Send us your plant volume and routes
Tell us daily pour volume, worst continuous pour window, typical delivery radius, road conditions and whether charging access exists, and our engineering team will match you to the right drum size and powertrain across the concrete mixer truck range, the electric mixer and the wider new energy truck line-up. The same method family covers our other selection guides: the mining dump truck guide and the crawler crane guide.