Author Ultrasonic 24 2025 (red/black/lime)

Author Ultrasonic 24 2025 (red/black/lime)

Wheel diameter 24"

□ Suitable for rider height 125–140 cm

□ Weight 9.8 kg

□ New hydroformed duralumin frame, 32T single chainring, 150 mm shorter kids cranks

□ Duralumin fork, 11–40T cassette

□ KENDA Small Block Eight Kevlar tyres 24" × 1.95"

□ SHIMANO Acera components, 8 speeds

The Author Ultrasonic 24 kids bike offers unbeatable speed and race geometry. It is designed for children 125–140 cm tall. The ultralight hydroformed frame is complemented by a rigid duralumin fork. Everything is focused on low weight and maximum performance. Thats why it has light Tektro rim brakes, a single-chainring Shimano Alivio drivetrain with 9 speeds at the rear and folding Kevlar Kenda tyres with a fine tread. This achieves an attractive weight of under 10 kg. The bike is very fast on tarmac but also holds its own on lighter off-road trails. It will also suit ambitious racers who prefer speed to comfort. It comes in a colour variant suitable for boys and girls. A great choice for parents who know whats best for their child.

Frame geometry

Explanations

• S/T c-t - seat tube (center-top), seat tube length from the centre of the bottom bracket to its top
• S/T c-c - seat tube (center-center), seat tube length from the centre of the bottom bracket to the top tube axis
• T/T h - top tube horizontal, horizontal top tube length
• T/T a - top tube actual, actual top tube length
• H/T - head tube, head tube length
• C/S - chain stay, chainstay length
• W/B - wheel base, wheelbase (distance between the front and rear wheel axles)
• S/T ang. - seat tube angle, angle between the seat tube axis and an imaginary line connecting the front and rear wheel axles
• H/T ang. - head tube angle, angle between the head tube axis and an imaginary line connecting the front and rear wheel axles
• F/L - fork length, fork length from the bottom of the headset to the centre of the front wheel
• B/B drop - bottom bracket drop, distance between an imaginary line connecting the wheel centres and the centre of the bottom bracket
• F/R - fork rake, distance between the head tube axis and the fork axle measured at the centre of the front wheel, the so-called offset
• hb - handlebars
• stem - stem
• crank - cranks

Additional information