High Quality Content by WIKIPEDIA articles! The Velocette KTT is a racing British motorcycle made by Velocette. The most significant of the K series (the K rather curiously stood for Camshaft) the TT designation indicated that it was a TT production racing replica. The Velocette KTT was notable for having the first positive-stop foot gear change on a motorcycle. As well as being significant improvement for racing, this quickly replaced the difficult hand gear change lever and became the standard for almost all motorcycles to this day.