The Mavic Hub Bearings 6901 (M40078) are a set of bearings used in a wide range of Mavic wheels such as;

Ksyrium SLR / SLS 2011-2013
Ksyrium SR 2011-2012
Ksyrium SL 2011
R-SYS SLR 2011
R-SYS 2012-2013
Cosmic Carbone 2014
Ksyrium SLR/SLE/125 2015
Cosmic Carbone 40 Elite / Carbone SLE 2015
Cosmic Pro Carbon 2016-2017
Ksyrium Pro and Pro SL 2016 
Ksyrium Pro Exalith 2017 - 2017

To determine which bearings you need, you can enter the serial number of your wheel on the  Mavic Technical Page 
Please note: If we do not have the spare part you need on our website, please give us a call at 01525 381347 with the Mavic item code at hand. We are able to special order any Mavic spare part.