Tern GSD S10 (Gen 3): the only bike here that genuinely replaces a car

We ran the GSD S10 the way it is meant to be run: two children on the back, a week of supermarket trips, a 28 kg flat-pack, and one memorable journey with a folded travel cot and a dog. It did all of it without complaint, and it stopped in the rain with a child on the back better than anything else we have ridden.

The ABS is the headline and nobody talks about it

Bosch's eBike ABS on the front wheel is the most consequential feature on this entire index. A loaded cargo bike has a lot of momentum and a high centre of mass; grabbing the front brake on a wet manhole cover is how people end up in hospital.

We tested it deliberately: 25 km/h, wet painted road markings, hard front lever. Without ABS the front wheel locks and the bike goes down. With it, the wheel pulses, the bike stays upright, and you stop in 4.4 m with 40 kg of load on the rack. That is not a spec-sheet feature, it is the reason to buy this particular cargo bike over a cheaper one.

With 40 kg of load on wet paint, the ABS is the difference between a stop and a fall. We tested it. It works.

Capacity that is actually usable

210 kg gross vehicle weight, 100 kg of it on the rear rack. Those are the numbers Tern publishes and they are the numbers we loaded to. Crucially, the GSD does not get vague or wobbly as the load goes up — the short wheelbase and 20-inch wheels keep the whole thing feeling like a bicycle rather than like a trailer with ambitions.

Cane Creek suspension takes the harshness out of the rear for passengers. Over a month of school runs, neither child complained about the ride, which is a more rigorous test than anything we could measure.

Range, measured under load

Tern quotes 42–85 km on the 400Wh pack and 97–195 km on the 900Wh. Our loop with a 40 kg load and 78 kg rider, on the 400Wh pack in the highest assist, returned 63 km. That is at the upper end of Tern's own band and reflects how efficiently the Bosch Cargo Line uses its gearing.

Dual-battery capability is the reason this is a genuinely different proposition from a normal e-bike. With both packs fitted, range anxiety stops existing and the bike becomes a legitimate option for a 40 km school-and-work loop with errands on the end of it.

It folds, and that is why you can own one

The GSD's party trick is that it stands vertically on its rear rack and the bars fold, reducing the footprint to something that fits in a hallway or a lift. On a bike this long, that is not a convenience feature — it is what decides whether the purchase is possible at all for somebody without a garage.

We stored it upright in a 90 cm-wide hallway for four weeks. Getting it into position takes about fifteen seconds and a bit of technique. It is heavy and the manoeuvre is not elegant, but it works, and no other cargo bike of this capacity does it.

It also fits in the back of a mid-size estate car with the wheels off, which matters once a year and matters a lot when it does.

Four weeks of ordinary use

Maintenance: nothing. Not one adjustment, not one rattle, not one loose fastener across a month of heavy loaded use. That is the 10-year warranty and the 7-year parts commitment showing up as build quality rather than as paperwork.

Two observations from living with it. The Bosch Smart System display is genuinely good and the app's route planning accounts for the assist you have left, which on a loaded school run is the information you actually want. And the accessory ecosystem — rails, pads, panniers, canopies, child seats — is deep enough that the bike adapts as children grow, which is not true of most cargo bikes.

Charging is roughly three and a half hours for the 400Wh pack. Both batteries are removable, and the UL 2849 certification covers the whole system rather than just the cells, which for something charging in a family home overnight is the correct standard to hold out for.

The things that cost money

• $4,999 is for the bike. Seat pads, passenger rails, panniers and a canopy are all extra and all things you will want

• The second battery is a significant additional cost

• It is long — check your hallway and your bike rack before ordering

• Servicing needs a Bosch-certified dealer, which is common but not universal

Against the RadWagon 5

Rad's RadWagon 5 costs $2,399, carries 170 kg of payload, and is a good cargo bike. It has no ABS, a hub motor rather than a Bosch mid-drive, and nothing like Tern's warranty. If the budget is fixed at half the money, buy the Rad without embarrassment. If you can find the difference, the Tern is worth it and this is the rare case where we would say that plainly.

Verdict

9.1 and the highest build and safety scores we have given anything. This is the machine on this list most likely to change how a household moves, and the only one where the phrase 'replaces a car' survives four weeks of use.