Using Japanese made Sunstar SO3 provides the following features and benefits:

1. Attachable to any bicycle
The unit can be mounted with the bottom bracket as the center, which makes it possible to attach to any kind of bicycle in a short time (10 minutes or so).

2. Light Weight
The weight of the unit is only 3.2kg (excluding battery & small parts). Increase in weight of the bicycle is minimized so it can be easily ridden in the same way as a regular bicycle. Battery weight: 1.1 kg/2.5Ah, 1. 45 kg/5.0Ah. Small parts weight: 0.7 kg

3. Compact high-powered Lithium-ion battery
High performance Lithium-ion battery can produce large amounts of electric power even at low temperature. This enables powerful assist in cold mornings during winter. There is a selection of 1 among 2 types of batteries based on the bike type.

4. Mode switch (Eco, Normal, Turbo)
3-mode switch enables the rider to choose the best combination of power and battery efficiency.

Frame
CrMo female frame with fender and rack braze-ons, integrated kickstand bracket.

Fork
City style fork with fender and rack braze-ons.

Head set
1" threaded.

Crank
46T. Length : 170mm.

BB set
Square taper.

Chain
KMC Z410, 1/2" x 1/8".

Pedals
9/16" axle, ball bearings.

Brake set
Tektro, R365.

Seat post
Kalloy, SP248D, 300mm.

Saddle
Leather.

Brake lever
Tektro.

Stem
Adjustable quill stem.

Handlebar
Bar Bore: 25.4mm, Width: 480mm.

Grips
Velo.

Tires
700x32C with reflective strips.

Shifter
Shimano Nexus Inter-3 with
thumb shifter.

Free wheel
Shimano, 22T.

Wheel (front)
Alloy hub, alloy rim with stainless spoke, 36H.

Wheel (rear)
Shimano 3sp hub, alloy rim with stainless spoke, 36H.

Chainguard
Plastic chainguard.

Fender
Full alloy fender.

Kickstand
Alloy central mount.

Carrier
Alloy rear rack.

Battery type
Lithium-ion rechargeable.