Which Tern GSD Should You Buy? S10 vs P00 vs R14

By Gav Hudson, Big Butternut at Butternut Bikes. Last updated 2 October 2026.

The Tern GSD is the bike we sell most, and “which one?” is the question we get asked most. All three current models carry exactly the same, so you are really choosing gears, brakes and battery. Here’s the short answer, then the detail.

GSD S10Chain and gears, with ABS. £5,900, or £5,400 in Pearl White. GSD P00Belt drive and hub gears. £5,900. GSD R14Belt, electronic gears and ABS. £8,850, to order for January 2027.

What every GSD Gen 3 has in common

Whichever one you pick, you get the same bike underneath:

• The same Gen 3 frame, rated to 210 kg all in. That’s bike, rider, kids and shopping.
• A rear rack rated for 100 kg, with space for two kids or one adult passenger.
• The Bosch Cargo Line motor with 85 Nm of torque, for heavy loads and steep North London hills.
• Space for a second battery.
• A cockpit that adjusts without tools to fit riders from about 150 to 200 cm, so two parents can share one bike.
• The same Tern accessories: child seats, Clubhouse, Stow Decks, racks and weather kit.
• It stands up on its back end, so it takes up much less floor space when you park it.

Stand a GSD on its end and the frame has a message for you: “GSD standing by”.

So every GSD does the school run equally well. The differences are in how it changes gear, how it stops, and how much looking after it needs.

GSD S10 vs P00 vs R14 at a glance

The GSD P10 (£4,700, chain drive, no ABS, older Bosch system) is now in very short supply.

What is a belt drive, and why would you want one?

The Gates belt on a brand new GSD P00 in the shop. No oil, no rust, nothing to mark your trousers.

Most bikes drive the back wheel with a chain. A belt drive does the same job with a toothed belt reinforced with carbon fibre, like the one in the photos. It runs dry, so there’s no oil and no black marks on your hands, your trousers or the kids. It’s close to silent, it doesn’t rust if the bike lives outside, and it lasts a lot longer than a chain.

A cargo bike with a strong motor works its chain hard. Chains need cleaning and oiling, and they wear out and get replaced along with the sprockets. A belt takes most of that away.

A belt can’t move across sprockets the way a chain does, so belt drive bikes keep their gears sealed inside the rear hub. That turns out to be the other big benefit:

• You can change gear while you’re stopped. With derailleur gears you have to be pedalling to shift, so if you pull up at the lights in a high gear, you set off in a high gear. With two kids on the back, that matters. With hub gears you just change down while you wait.
• Nothing hanging off the back to get knocked. There’s no exposed derailleur to bend in a bike shed or get bashed out of line.
• The gears are sealed from the weather. Rain, grit and road salt stay out, so they keep working with very little attention.

The Enviolo hub on the GSD P00

The P00’s hub is an Enviolo Heavy Duty, and it’s worth a proper explanation because it doesn’t work like normal gears. There is no first, second or third. You twist the grip and the gearing changes smoothly from easy to hard, with nothing in between to click through. Tern quote a 380% range from one end to the other.

The Enviolo Heavy Duty hub in the back wheel of a GSD P00, driven by the belt, and the twist shifter on the bars.

The shifter shows a little rider on a hill. Twist one way and the hill gets steeper, which makes pedalling easier. Twist the other way and it flattens out for cruising. You never think in numbers. If the pedals feel heavy, you twist. If your legs are spinning, you twist back. It’s about as simple as bike gears get.

You can do it sitting still at the lights, and it’s smoothest if you ease off the pedals a touch as you twist. The trade-off is that a hub gear is a little less efficient than a derailleur. You’d only really notice on very steep hills, and that’s where the S10 has the edge.

A belt isn’t only a Tern thing, by the way. The Tern HSD, Veloe Multi, Bike43, Muli and Estarli eCargo all offer one.

The GSD S10 keeps a chain and derailleur. They’re simple, familiar and easy to service, and any bike shop can look after them. They just want a bit more care.

GSD S10 or P00? Same price, different bike

These two cost the same, so this is the choice most people are actually making.

The S10 has derailleur gears and a chain, like most bikes you’ve ridden. It’s also the better-equipped bike of the two. On top of the Bosch ABS you get:

• A built-in tracker. Bosch charge a subscription for it after the first year.
• A bigger colour display that you can take off the bike when you park.
• A USB-C port.
• A Thudbuster suspension seatpost.
• A better fork, better tyres and bigger brake discs.

It’s also the better bike on really steep hills, because derailleur gears are more efficient than a hub gear.

We’ll be honest, when Bosch ABS first appeared on cargo bikes we were a bit sceptical. Having ridden the S10 a lot, fully loaded, on wet roads and steep descents, we can say it’s genuinely brilliant. It helps stop the front wheel locking under hard braking, so you keep steering control when it really matters. We even have a gravel test track near the shop, so you can try it for yourself.

The P00 swaps the chain and derailleur for the belt and Enviolo hub described above. It’s quiet and clean, and you can change gear while stationary, which is perfect for school gates and traffic lights. It doesn’t have ABS and the display is simpler. The tracker can be added as an extra.

Our rule of thumb: if you want the best braking and the most kit, or you live up a really steep hill, go S10. If you want the least faff, go P00. The S10 is the one most of our customers choose, but for many families the P00 is a great swap. We have both in the shop, so you can ride one straight after the other.

Is the GSD R14 worth the extra?

The R14 is the no-compromise one. It has ABS like the S10 and a belt drive like the P00, plus Rohloff E-14 electronic hub gears, which shift at the press of a button and drop to an easier gear by themselves when you stop. It also comes with an 800Wh battery, where the other two have 545Wh.

It’s £2,950 more than an S10. For heavy daily use and long-term ownership that can make sense: sealed hub gears and a belt mean fewer wear parts and less workshop time. If that isn’t you, the S10 or P00 does exactly the same carrying for a lot less. The R14 is sold out for now, and available to order for January 2027.

Batteries and range

The S10 and P00 come with a 545Wh battery, which Tern quote at 45 to 98 km per charge. The R14’s 800Wh battery is quoted at 67 to 144 km. Where you land in that range depends on load, hills and how much assistance you use. Every GSD has space for a second battery if you do big miles.

At the moment Tern will give you a bigger battery on a Pearl White S10 at no extra cost, if you’d rather have that than the £500 saving. The details are on the GSD S10 page.

What about the GSD P10?

The GSD P10 is the cheaper GSD at £4,700. Tern aren’t making or shipping any more, so they’re in very short supply. If you’re set on one, get in touch and we’ll see what we can do.

Before you do, come and ride an S10 or a P00. The P10 has the same frame and carries the same load, but it uses Bosch’s older system, with no ABS, no tracker and a basic display. We think the other two are better bikes, and well worth the £1,200. Through Cycle to Work the gap gets smaller too, because your tax saving applies to the whole price. Depending on your tax band that saving can be up to around 47%.

If a GSD is more than you want to spend

If you want a Tern that carries two passengers for less, the Quick Haul Long is £3,500. The Veloe Multi starts at £3,299 and rides a lot like a normal bike.

Our honest advice is to ride one of those and a GSD on the hill outside, one after the other. Most people can feel the difference. The only question worth answering is whether it’s worth the difference to you.

Quick questions

Which Tern GSD is the most popular?

The GSD S10. It’s the model we recommend most often, because it hits the sweet spot between performance, safety, ease of use and long-term ownership.

Do all the GSD models carry the same weight?

Yes. Every GSD Gen 3 is rated to 210 kg gross vehicle weight, with a rear rack rated for 100 kg. That’s two kids or one adult passenger on the back.

Which Tern GSD has a belt drive?

The GSD P00 and the GSD R14 both have a Gates belt drive with hub gears. The GSD S10 has a chain and Shimano derailleur gears.

Is the GSD S10 or the P00 better on steep hills?

The GSD S10. Its derailleur gears are more efficient than a hub gear, which you notice on really steep hills. Both have the same Bosch Cargo Line motor.

Does the GSD P00 have ABS?

No. Bosch ABS is fitted to the GSD S10 and the GSD R14.

Is the GSD P10 still available?

The GSD P10 is in very short supply, because Tern aren’t making or shipping any more. If you’re interested in one, get in touch or come and test ride a GSD with us. We think the S10 and P00 are better bikes, and through Cycle to Work the price gap is smaller than it looks.

Where can I test ride a Tern GSD in London?

At Butternut Bikes, 143 Crouch Hill, Crouch End, London N8 9QH. There’s a hill right outside, and we can set up back-to-back test rides so you can feel the differences for yourself.