Britain’s David Millar used a SRAM hybrid drivetrain to tackle the Dolomites in the Giro d’Italia last week – a mix of road bike and mountain bike components.
The Team Garmin-Cervélo rider wanted to use 52 and 42 tooth chainrings on his Cervélo S3. Other riders running SRAM, including race leader Alberto Contador, used a wide-ranging (11-32T) SRAM WiFLi cassette to get low ratios for the climbs.
In order for Millar to get similarly low ratios with a 42 tooth chainring, he needed to use a cassette with even larger sprockets. He went for an 11 to… wait for it… 36 tooth SRAM XX cassette. That inner sprocket is huge. He had to have an XX rear mech cope with the size of it.
SRAM’s XX groupset is 10-speed but rather than the usual mountain biking triple chainset, it’s designed for a double.
Mat has worked for loads of bike magazines over 20+ years, and been editor of 220 Triathlon and Cycling Plus. He's been road.cc technical editor for eight years, testing bikes, fettling the latest kit, and trying out the most up-to-the-minute clothing. We send him off around the world to get all the news from launches and shows too. He has won his category in Ironman UK 70.3 and finished on the podium in both marathons he has run. Mat is a Cambridge graduate who did a post-grad in magazine journalism, and he is a past winner of the Cycling Media Award for Specialist Online Writer.