Are 6400 STIs (Ultregra 8 speed) double specific or they can successfully be used with triple (like 9-speed Ultegra STIs - 6500, 6510 etc.)?
Thanks in advance.
Thanks for your reply. As for 6500 series, all shifters (6500, 6501, 6510) are universal afaik - they can handle both double and triple. I was using 6500 ones with both double and triple last year, they shift great.