Tern GSD S10 Electric Bike
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A city-ready utility e-bike made with families in mind, the Tern GSD S10 electric bike can carry 2 kids or up to 400 lbs. of cargo, despite being the same length as a standard e-bike.
Shop similar productsKey Details
- Folding technology compacts to a third of its full size in only 10 seconds so you can store it in your apartment, fit it in the elevator or stash it on a train
- Carries 2 kids (Thule Yepp Maxi child seats sold separately) and a week's worth of groceries—up to 400 lbs. of cargo, including rider
- Low step-through frame makes getting on and off easy
- When you're riding uphill with the kids on the back, rely on the Bosch motor and battery to deliver outstanding performance and power
- Adjusts to fit riders from 4 ft. 8 in. to 6 ft. 4 in., so the whole family can ride
- NOTE: Specs and images are subject to change based on component availability
Imported.
- 1 year of free adjustments (see more below)
- In-store bike assembly
- Pickup in store or curbside
- Bike experts available at 170+ bike shops
- An additional year of free adjustments on e-bikes
- 20% off shop services
- Free tubes with purchase of flat tire repair (Co-op Cycles brand tubes only; tube must be installed at time of purchase)
New bikes go through a normal break-in period, after which they should be readjusted. All electric bicycles sold at REI include free adjustments for the defined period (one year after purchase date for non-members, or two years for REI Co-op Members)—as many times as you need. Included: derailleur and brake adjustments, lateral wheel truing, hub and headset bearing adjustments, tire inflation, chain lubrication and e-bike firmware updates. Not included: replacement or installation of new components or accessories, any other services. Call your local REI Co-op Bike Shop for more information.
UL2849 certified
| Best Use | Urban Cycling |
|---|---|
| E-Bike Classification | Class 1: pedal assist up to 20 mph |
| Motor | Bosch Performance Line, 250W |
| Motor Type | Mid-Drive |
| Motor Torque (Nm) | 63 Newton meters |
| Battery Type | Lithium Ion |
| Battery Capacity (Wh) | 400 watt hours |
| Pedal Assist Range | 31 - 68 miles |
| Frame | 7005 aluminum |
| Step-Through | No |
| Bike Suspension | No Suspension |
| Fork | 6061 aluminum |
| Crankset | Tern GSD Custom with forged 6061 aluminum DH crank arm |
| Bottom Bracket | Motor integrated |
| Shifters | Shimano Deore 1 x 10-speed |
| Rear Derailleur | Shimano Deore Shadow+ |
| Rear Cogs | Shimano 11-36T, 10-speed |
| Number of Gears | 10 |
| Brake Type | Hydraulic Disc Brake |
| Brakes | Magura MT-4, 4 piston hydraulic, 180mm rotor |
| Brake Levers | Magura, hydraulic |
| Rims | Tern Atlas, ultra wide 36mm, dual reinforced joint |
| Front Hub | Tern Atlas, Boost thru-axle |
| Rear Hub | Tern Atlas, Boost thru-axle, e-bike reinforced design |
| Wheel Size | 20 inches |
| Tires | Schwalbe Super Moto-X, 62-406, Green Guard puncture protection, Reflex |
| Tire Width | Unavailable |
| Handlebar Shape | Moustache Bar |
| Handlebar | Tern Sweep, 27°, 6061 aluminum, Tern Andros adapted |
| Stem | Tern Andros (G2), adjustable, forged construction, patented technology |
| Seat Post | Tern Telescope, 34.9mm, 2014 aluminum |
| Saddle | Tern GSD, with rear handle |
| Pedals | Urban with nonslip surface, sealed bearings |
| Headset | Tern Flux Pro Taper, 1.5 in., angular contact bearings, Physis integrated |
| Chain | 10-speed, DHT for e-bike, GST corrosion-resistant coating |
| Weight | (With 1 battery): 59 lbs. 10.5 oz. |
| Bike Weight | Bike weight is based on median size, as sold, or the average of two median sizes. |
| Gender | Unisex |
| One Size | |
|---|---|
| Height Range | 4'11"-6'5" |
How we measure bikes
- Standover Height Standover Height is a measurement from the ground to the top of the top tube, measured at the midpoint of the top tube.
- Reach Reach is the horizontal distance from the center of the cranks to the center of the head tube, measured at head tube level.
- Stack Stack is the vertical distance from the center of the cranks to the center of the head tube, measured to the top of the head tube.
- Effective Top Tube Effective top tube is the distance from the center of the head tube to the center of the seat tube/seat post, measured parallel to the ground.
- Seat Tube Center to Top Seat Tube length is the measurement of the seat tube, from the center of the cranks to the top of the seat tube.
- Head Tube Length Head Tube Length is measured from the bottom to the top of the head tube.
- Head Tube Angle Head Tube Angle is the acute angle between the head tube and the ground (measured towards the rear of the bike)
- Seat Tube Angle Seat Tube Angle is the acute angle between the seat tube and the ground (measured towards the rear of the bike).
- Bottom Bracket Height Bottom Bracket Height is a measurement taken vertically from the ground up to the center of the cranks.
- Wheelbase Wheelbase is the measurement from the center of the front axle to the center of the rear axle.
- Chainstay Length Chainstay Length is the measurement from the center of the cranks to the center of the rear axle.
- Fork Offset Fork Offset, or rake, is the distance from the front axle to a line drawn parallel to the center of the head tube or steering axis.
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Dream bike
Our family had been eyeing this bike for over a year and we finally pulled the trigger and purchased it from REI. 100 miles in and we could not be happier. The bike works for me and my husband and our toddler and 4 year old love it too. The real selling points for me were the 20” tires - kids lower to the ground makes balance much easier and makes me feel safer - and the relatively low profile for a mid-tail cargo bike. We have a narrow hallway with tight turns to get to building bike storage and this bike can maneuver it while others just can’t. Did you know you can also store it upright?! It’s really thoughtfully designed for city living. While we looked at less expensive options, the GSD really was the perfect bike for our family. It’s zippy and feels safe and it is a real pleasure to ride. The other day we went food shopping and got up a huge hill with a bunch of groceries on the front rack and two kids sitting on the back, no problem. We look forward to using it for many years to come!
The second car
After a bit over 150 miles, I am happy to report that the Tern GSD is indeed the dream bike I've been looking for. My kiddo dubbed is "the fast bike" as our old bike was getting slower as he got bigger. The clubhouse in the back keeps him secure and up out of traffic (bike lanes in my city often go between two lanes of traffic) along with bags for when we need to do grocery stops. After transporting him to and from preschool for over a year on the back of a regular, 14 year old Trek bike, the stability of the Tern with a small passenger is such an improvement (thank you, 20 inch wheels!). The pedel-assist helps with the hills and has brought back a lot of confidence to my biking. Sure, less exercise for me, but when the temperatures next summer crest over 100 again coming to my desk not covered in sweat after drop off is going to be amazing. We've already left the car in the garage for a few trips in favor of taking the bike and I look forward to many more bike trips to the weekend farmer's markets. And kudos to the REI bike shop staff for being excited with me from ordering to building to delivery.
Car replacement!
I've been riding my GSD for one week now—it's likely dollar-for-dollar the best investment I've made. Rides like magic, carries my kids, my groceries, my dreams :D.
Well built
This is a solid bike and you get what you pay for. Most bike repair shops refuse to service lower end online ebikes because the components (brakes, spokes, chain, etc.) are not built for the speed and weight of an ebike. The hydraulic brakes on this bikes will stop quickly which is vital when I am carrying a precious load like my grandson. The GSD is long and the center of gravity is low so the likelihood of going over the handlebars is low. I crashed into a log in the dark with no damage to the frame and no flip. I probably get about 30 -35 miles per charge which is great for errands around town. The front cargo rack is very useful. My headlight is not that bright but I saw that the new model has a brighter light and and easier to deploy kickstand. The Thule child seat attaches without any additional hardware.