A cargo bike is not an ordinary bike
A loaded longtail, a box bike with two children, a professional delivery trike — these bikes regularly carry 80 to 150 kg of payload on top of the rider. That radically changes the mechanical stresses compared to a standard 15 kg bike carrying a single person.
Cargo bike maintenance must be more frequent, more rigorous, and focused on specific points that standard bikes don't stress as much.
Frame and welds — structural inspection
A cargo bike frame endures bending, torsion, and fatigue forces far beyond those of a regular bike. Weld points are the most vulnerable areas.
Check monthly:
- Head tube welds: this is the maximum stress zone on a box bike (the lever arm between the front wheel and head tube is enormous). Look for radial cracks
- Cargo platform welds: the attachment points of the box or platform endure constant vibrations
- Kickstand mounting points: the center kickstand often supports the full weight of bike + load when parked. Welds and reinforcements around the mount must be flawless
- Frame/integrated rack junction (longtail): check mounting bolts and look for cracks around inserts
A cracked frame on a cargo bike is an immediate danger — the bike can fold in half under load. Any visible crack = stop immediately and seek professional repair.
Steering and linkage
Box bikes (Babboe, Urban Arrow, Riese & Muller Load) use an indirect steering system with tie rods or a steering cable. This system requires specific maintenance.
Steering tie rods:
- Check ball joint play: grab the front wheel and try to pivot it laterally. No play should be perceptible
- Lubricate ball joints every 500 km (lithium or marine grease)
- Check ball joint nut torque: 15-20 Nm depending on model
Headset:
- More stressed than on a normal bike due to weight
- Check: front brake applied, push the bike back and forth. No clicking should be perceptible
- Bearing replacement recommended every 5000-8000 km (vs 10000+ on a light bike)
Brakes — accelerated wear
It's simple physics: braking 150 kg at 25 km/h requires far more energy than braking 85 kg. Cargo bike brakes wear 2 to 3 times faster than standard bike brakes.
Hydraulic disc brakes (standard on modern cargos):
- Pads: check every 500-800 km (vs 1500-2000 on a light bike). Minimum pad material thickness: 0.5 mm
- Rotors: check thickness every 2000 km. Minimum thickness is engraved on the rotor (typically 1.5 mm for Shimano, 1.8 mm for some models)
- Hydraulic bleed: every 12 months or if the lever feels spongy
- Recommended rotor size: 180 mm minimum front, 160-180 mm rear. Some high-end cargos run 203 mm
Tip: if your pads wear out in less than 500 km, switch to sintered (metallic) pads. They last longer under heavy loads and resist heat build-up better, even though they're noisier.
Tire pressure and load
Tire pressure must be adapted to actual load, not the "standard" pressure printed on the sidewall.
General rule:
- Rear tire (longtail) or front tire (box bike) on the loaded side: maximum pressure marked on sidewall, or very close to it
- Tire on the unloaded side: normal pressure
- Schwalbe Pick-Up (the reference cargo tire): designed to support 150 kg/tire, available in 20" and 26"
Checking:
- Weekly if the bike rides daily
- After any exceptionally heavy load (moving house, large shopping)
- Low pressure + heavy load = risk of pinch flat (snake bite) and premature sidewall wear
