The QR type hub is ideally suited to 20” wheel at 6V3W output or 26”/700C wheel at 6V2.4W output and perfect for centerlock disc brake. Innovation is all about making self-breakthrough. SP 9 series has now successfully challenged the 8 series by achieving unprecedented dynamo characteristics. SL-9 is the world’s lightest centerlock dynamo as weight 323g only. SP has been devoted in the dynamo evolution. Further advancement has always been the goal.