Frog and Dimitris Katsanis introduce breakthrough design
by Andrew Kelly
Frog Bikes has worked with independent scientific researchers to study the impact of Q factor (pedal spacing) for children. They were surprised to find that reducing the Q factor of a child's cycle decreases lateral forces by much more than for adults. i.e. it makes the bike significantly easier to pedal.
Frog has taken the Brunel University research and worked with Dimitris Katsanis of Metron Advanced Equipment (the man behind the all-conquering GB Team track bikes) to design new cranks that reduce the Q factor by between 27mm and 36mm depending on the Frog model. These cranks are on all new Frog bikes available in the market since June 2015.
The new cranks deliver a more comfortable ride and improve the efficiency for kids - who of course have a much narrower pelvis than an adult. Thus, for a child riding a bike with pedals conventionally widely spaced, the child's legs are splayed outwards to the left and right sides of the longitudinal axis of the cycle. This results in poor conversion of the work performed by downward movement of the child's legs into the rotation of the chain.
Other innovations already introduced as a result of the research include even shorter cranks, a steeper seat tube angle and a shorter reach - all aimed at making a child's riding experience as comfortable and enjoyable as possible.
Jerry Lawson, Chief Frog at Frog Bikes said
"Children are not just scaled-down adults: they have specific bike requirements which are not currently well met. We are applying the same rigour to the design of kids' bikes that is usually applied only to adult bikes. This means that Frog bikes are not only extremely light and well-made, they also incorporate unique research-led design features which make them much more comfortable for children to ride."
Dimitris Katsanis said
"It has been a real pleasure to work with Frog Bikes on this project. Although the ultimate aim of the research is to increase the fun that children derive from riding their bicycles it is nevertheless a serious piece of engineering with significant results.
This is more than a marginal gain. I wish we could find something similar for the Olympic bikes too. And you never know, some of these children might end up being the Olympic champions of the future. "
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