Tern · Cargo & utility · discontinued
Tern GSD S10 (Gen 2): real range, hills and charging
A 180 lb rider on the Tern GSD S10 (Gen 2) at 16 mph with relaxed pedaling over rolling hills (±2%) on pavement can expect about 22 miles per charge (18–27 mi), using 16 Wh per mile. The brand claims up to 53 miles. That is about 42% of the claim. At full assist with almost no pedaling over hills it drops to about 15 miles. It is discontinued; of the current cargo e-bikes we track, the lowest-priced that goes as far is the Lectric XPedition2 (single battery) ($1,399, about 36 miles).
See the Lectric XPedition2 (single battery) range · Check price at Lectric
400
Wh battery
250
W motor
20
mph max
Price checked 2026-10-23. We may earn a commission.
How far does the Tern GSD S10 (Gen 2) go for your weight?
Miles per full charge on a new battery at 70°F on pavement, no wind. Each number is the middle of a ±20% band. Tern claims 26–53 miles (single 400 wh battery. with dual 900 wh: 60-121 miles.).
| Rider weight | Easy 12 mph | Everyday 16 mph | Fast 20 mph | Full assist, hills |
|---|---|---|---|---|
| 150 lb | 38 mi (31–46) | 23 mi (19–28) | 16 mi (13–19) | 17 mi (13–20) |
| 200 lb | 35 mi (28–41) | 22 mi (17–26) | 15 mi (12–18) | 14 mi (12–17) |
| 250 lb | 31 mi (25–38) | 20 mi (16–23) | 14 mi (12–17) | 13 mi (10–15) |
| 300 lb | 29 mi (23–35) | 18 mi (14–21) | 14 mi (11–17) | 11 mi (9–14) |
- Easy 12 mph: 12 mph, relaxed pedaling, flat
- Everyday 16 mph: 16 mph, relaxed pedaling, rolling hills
- Fast 20 mph: 20 mph, relaxed pedaling, rolling hills
- Throttle, hills: 15 mph, no pedaling, hilly
Can the Tern GSD S10 (Gen 2) climb hills?
Highest steady speed on each grade, motor at an estimated 400 W peak. A 10% grade is a steep city street; 15% is a hard hill.
| Rider | 5% grade | 10% grade | 15% grade |
|---|---|---|---|
| 180 lb, full assist | 9 mph | 5 mph | 4 mph |
| 180 lb, pedaling | 11 mph | 7 mph | 5 mph |
| 250 lb, full assist | 8 mph | 4 mph | stalls |
| 250 lb, pedaling | 9 mph | 5 mph | 4 mph |
Steepest grade at 8 mph (180 lb): 6% on throttle, 8% with moderate pedaling. Peak power lasts for short hills; on long climbs motors fall back toward their 250 W nominal rating.
Charging time and cost
Empty to full (4 A)
3 h 1 min
Charger
4 A
Cost per full charge
$0.09
Cost per mile
0.35¢
US average residential electricity, 18.31¢/kWh (EIA, July 2026), 85% charger efficiency. Charge time: constant current to ~85%, then about an hour of top-off.
Range in cold weather
70°F
22
mi · 100% cap.
50°F
20
mi · 94% cap.
32°F
18
mi · 85% cap.
20°F
16
mi · 75% cap.
Everyday scenario, 180 lb rider. Capacity loss is temporary; store and charge the battery indoors and never charge it below freezing.
Simulate your own ride on the GSD S10 (Gen 2)
Tern GSD S10 (Gen 2) specs
From the Tern product page, checked 2026-10-23. est. marks values Tern doesn't confirm.
- Price
- $4,499
Source note
Specs are for the GSD S10, the most common US Gen 2 trim. Other Gen 2 trims were the S10 LX, S00 LX and R14. The Gen 2 page is still live at $4,499 (single 400 Wh battery), but the US bike catalog (ternbicycles.com/us/bikes) now lists only Gen 3 GSD models, so Gen 2 is treated as no longer sold new. Archived MSRPs, single / dual battery: Feb 2021 $5,099 / $5,899; June 2022 $5,399 / $6,099; Oct 2023 $4,999 / $5,699. The Gen 3 bike also uses the name 'GSD S10'. ternbicycles.com
- Class
- Class 1, no throttle est.
Source note
The brand page gives pedal assist only (no throttle) to 20 mph in the US. Tern does not print the class number on this page. ternbicycles.com
- Top assisted speed
- 20 mph
Source note
- Battery
- 400 Wh (36 V × 11 Ah), removable, dual-battery option
Source note
Brand: 'Bosch Dual Battery system, 400 Wh/900 Wh'. The bike ships with one 400 Wh Bosch PowerPack, and a second 500 Wh pack gives 900 Wh. 36V/11Ah is the standard Bosch PowerPack 400 rating; Tern does not print it. ternbicycles.com
- Motor
- 250 W nominal, mid-drive est.
Source note
Tern lists the Bosch Cargo Line motor without a watt rating. Electric Bike Report, reviewing the same motor on the GSD Gen 3, calls it a 250W Bosch mid-drive. electricbikereport.com
- Torque
- 85 Nm
Source note
Bosch Cargo Line, 400% assist. ternbicycles.com
- Pedal sensor
- Torque
- Claimed range
- 26–53 mi (Single 400 Wh battery. With dual 900 Wh: 60-121 miles.)
Source note
- Weight
- 74 lb with battery
Source note
33.58 kg. ternbicycles.com
- Max load
- 366 lb rider + cargo est.
Source note
Calculated as the brand's 440 lb (200 kg) max gross vehicle weight minus the 74 lb bike. Max rider weight is 264.6 lb (120 kg), and the rear rack is rated 220 lb (100 kg). ternbicycles.com
- Wheels & tires
- 20" × 2.4"
- Frame
- 6061 aluminum, patented MultiTruss design, one size (rider 4'11"-6'5"); front 55-406 (2.15") and rear 62-406 (2.4") tires
- Charger
- 4 A
Source note
Bosch charger, 100-240V, 4A (US). ternbicycles.com
- Safety certification
- No UL standard named on the product page
Common questions
What is the weight limit of the Tern GSD S10 (Gen 2)?
Tern rates the GSD S10 (Gen 2) for 366 lb total (rider plus cargo). At 300 lb it still goes about 18 miles in everyday riding.
Can the Tern GSD S10 (Gen 2) climb steep hills?
On throttle alone, with a 180 lb rider, it can hold 8 mph up a grade of about 6% (our estimate from its 400 W estimated peak power). With moderate pedaling, about 8%. On a 10% hill it holds about 5 mph on throttle.
How long does the Tern GSD S10 (Gen 2) take to charge?
About 3 h 1 min from empty with the 4 A charger. A full charge costs about $0.09 at the US average of 18.31¢/kWh, or 0.35¢ per mile.
Is the Tern GSD S10 (Gen 2) a Class 2 or Class 3 e-bike?
Tern lists it as Class 1, with a top assisted speed of 20 mph and no throttle.
Which hitch racks fit the GSD S10 (Gen 2)?
At 74 lb with battery (about 70 lb without it) and 2.4" tires, 12 of 23 hitch racks we track can carry it (some only with the battery removed).
| Kuat Piston ION 2-bike | 100 lb/bike | Fits |
| 1UP USA Super Duty Double | 100 lb/bike | Fits |
| Saris MHS 2 Bike Package | 100 lb/bike | Fits |
| Aventon Hitch Rack Pro | 85 lb/bike | Fits |
| Yakima OnRamp LX | 80 lb/bike | Fits |
| Hollywood Racks Sport Rider for Electric Bikes | 80 lb/bike | Fits |
| Hollywood Racks RV Rider E-Bike Rack | 80 lb/bike | Fits |
| Aventon Hitch Rack | 77 lb/bike | Fits |
| Thule Epos 2-bike | 75 lb/bike | Fits |
| Yakima StageTwo | 70 lb/bike | Fits with battery removed |
| Hollywood Racks Destination E | 70 lb/bike | Fits with battery removed |
| Allen Sports High Capacity Locking Premier for Electric Bikes | 70 lb/bike | Fits with battery removed |
Doesn't fit: Kuat Piston Pro X 2-bike (too heavy), Yakima OnRamp (too heavy), Thule EasyFold XT 2 (too heavy), 1UP USA Heavy Duty Double (too heavy), Thule T2 Pro XTR 2-bike (too heavy), Kuat NV 2.0 2-bike (too heavy), Kuat NV Base 2.0 2-bike (too heavy), Saris Door County 2-Bike Motorized (too heavy), Saris SuperClamp G4 2-Bike (too heavy), Hollywood Racks Sport Rider SE2 (too heavy), Saris Freedom G2 2-Bike (wheel size out of range).
All hitch racks →
