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Deal.ai › Compare

Goat Power Bikes Billy Goat SL vs Goat Power Bikes Billy Goat KD

These are not rivals for the same rider. The Billy Goat SL is a full-size, street-legal Class 2/3 e-bike for adults: 750W motor, 52V 20Ah Samsung battery, 4-piston hydraulic brakes and a 7-speed drivetrain. The Billy Goat KD is a 39 lb kids' bike for ages 8–13 up to 150 lb, with a 250W motor capped at 19 MPH and a single 160mm disc brake. Buy the SL for commuting and hills; buy the KD for a young rider learning to ride.

  • Choose the Billy Goat SL if you are an adult who wants a street-legal Class 2/3 bike with real hill-climbing torque, hydraulic brakes and 60+ miles of pedal-assist range.
  • Choose the Billy Goat KD if you need a light, low 24.5-inch seat-height e-bike for a rider aged 8–13 under 150 lb, with capped speeds and a 3–4 hour charge.

Prices

  • Goat Power Bikes Billy Goat SL: $1,999.00 at Goat Power Bikes (last seen Nov 13)
  • Goat Power Bikes Billy Goat KD: $799.00 at Goat Power Bikes (last seen Nov 13)
  • Difference: the Goat Power Bikes Billy Goat KD is $1,200.00 cheaper than the Goat Power Bikes Billy Goat SL at the latest prices (Nov 13)
Goat Power Bikes
The Billy Goat SL

Goat Power Bikes Billy Goat SL

The Billy Goat SL

$1,999.00at Goat Power BikesChecked Nov 13
See all prices and details
Visit Goat Power Bikes
Pros
  • 70Nm torque climbs hills with a loaded rider
  • Class 2 throttle and Class 3 pedal assist keep it street legal
  • 4-piston hydraulic brakes and puncture-resistant fat tires
  • Turn signals, horn, key ignition and rear wheel lock
  • Rated 4.9 across 452 owner reviews
Cons
  • 6–7 hour full charge
  • Heavy and awkward to carry upstairs
  • 1,000W peak is below Goat's V3 models
Goat Power Bikes
The Billy Goat KD

Goat Power Bikes Billy Goat KD

The Billy Goat KD

$799.00at Goat Power BikesChecked 23 h ago
See all prices and details
Visit Goat Power Bikes
Pros
  • 39 lb net weight is easy for a parent to lift
  • 3–4 hour charge time
  • Low 24.5-inch seat height suits shorter riders
  • Speed levels let kids build confidence gradually
  • Aluminum frame, LED headlight and taillight
Cons
  • 150 lb max load rules out most adults
  • 250W motor and 19 MPH cap limit range and hills
  • Single disc brake and no suspension

What separates them

Goat Power Bikes Billy Goat SLGoat Power Bikes Billy Goat KD
RiderAdult, full-size frameKids ages 8–13, max 150 lb
Motor750W, 1,000W peak, 70Nm250W
Top speed20 MPH throttle, 25 MPH pedal assist12 MPH standard, 19 MPH power mode
Battery and charge52V 20Ah Samsung, 6–7 hour charge36V 10Ah, 3–4 hour charge
Range35+ miles electric, 60+ miles pedal assistNot published; small 36V 10Ah pack
BrakesKarasawa 4-piston hydraulic discSingle 160mm disc
WeightHeavier full-size build39 lb net, easy to move and store
Drivetrain and tiresShimano 7-speed, 20x4 fat tiresSingle speed, 16x3.0 city tires

Price history

$1,999.00$559.30
Nov 6Nov 13
  • Goat Power Bikes Billy Goat SL: lowest $1,999.00 on Nov 13 at Bolton Ebikes.
  • Goat Power Bikes Billy Goat KD: lowest $559.30 on Nov 13 at Goat Power Bikes.

Prices at every store

Goat Power Bikes Billy Goat SL

  • Goat Power BikesNew

    In stockReturn policy

    $1,999.00Checked Nov 13
    Visit Goat Power Bikes
  • Bolton EbikesNew

    In stock

    $1,999.00Checked Nov 13
    Visit Bolton Ebikes
All 2 stores and price history →

Goat Power Bikes Billy Goat KD

  • Goat Power BikesNew

    In stock

    $799.00Free shippingChecked 23 h ago
    Visit Goat Power Bikes

Also available at

  • Goat Power BikesCheck price at Goat Power Bikes
Prices and history →

Specs compared

SpecGoat Power Bikes Billy Goat SLGoat Power Bikes Billy Goat KD
Motor power750W (1,000W Peak)250W
Battery52V20AH Samsung Cells36V10AH
Torque70NM—
Throttle top speed20MPH (Class 2)—
Pedal assist top speed25MPH (Class 3)—
Charger58.8V/3A Charger—
Charge time6-7 Hours For Full Charge—
Electric range35+ Miles—
Pedal assist range60+ Miles—
TiresINNOVA Puncture Resistant Tires (F/20x4, R/20x4…—
BrakesKarasawa 4-Piston Hydraulic Disc Brakes—
ShifterShimano 7 Speed Shifter—
Show all 22 specsShow fewer specs
SpecGoat Power Bikes Billy Goat SLGoat Power Bikes Billy Goat KD
Battery size—11x3x4in
Battery weight—5LBS
Charging time—3-4H
Max speed standard—Level 1: 6MPH Level 2: 9MPH Level 3: 12MPH
Max speed power—Level 1: 9MPH Level 2: 13MPH Level 3: 19MPH
Dimensions—76x30x42in
Wheelbase—52in
Seat height—24.5in
Net weight—39LBS
Max load

What reviewers say

Goat Power Bikes Billy Goat SL

Owners rate the Billy Goat SL 4.9 across 452 reviews, praising its range, brakes and build. The main complaints are the long charge time and less peak power than the V3 line.

What people mention
  • RangePraisedRiders report the pedal-assist range holds up well for long commutes and errands.
  • BrakesPraisedThe 4-piston hydraulic discs are called strong and confidence-inspiring.
  • BuildPraisedOwners describe the bike as sturdy and well put together.
  • Charge timeCriticisedA full charge takes 6-7 hours, which owners find slow.

Questions and answers

Can an adult ride the Billy Goat KD?
Only if you weigh under 150 lb. The frame, 24.5-inch seat height and 250W motor are sized for riders aged 8–13, so most adults will be over the load limit and cramped.
Which is better for commuting?
The Billy Goat SL. It holds 25 MPH with pedal assist, has a 7-speed drivetrain for hills and 4-piston hydraulic brakes for traffic. The KD tops out at 19 MPH and is built for supervised family rides.
Which lasts longer on a charge?
The SL. Its 52V 20Ah Samsung pack is rated for 35+ miles electric and 60+ miles with pedal assist. Goat does not publish a range for the KD's smaller 36V 10Ah battery.
Is the SL worth stepping up to over the KD?
For an adult rider, yes. The SL adds roughly triple the motor power, a much larger battery, hydraulic brakes and a 7-speed shifter. The KD only makes sense as a kids' bike.
Which is easier to store and carry?
The KD at 39 lb. The SL is a full-size fat-tire bike with a 52V battery and is far heavier, so plan on ground-level storage or a ramp.
Do both have lights?
The KD has an LED headlight and taillight. The SL adds a high/low beam headlight plus front and rear turn signals and a horn, which matters for road riding.

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150LBS