1) Pedaling with the BPK is lighter than normal derailleur because friction loss should be decreased. Several customers reported their average speed increased more than 2km/h by their cycle computer.
2) You can use Outer/Low (front outer gear and rear inner gear) smoother than with normal derailleur. Or quite difficult to use like this with normal one. When you ride a bike on the uphill road, once front gear changes inner then you should also change rear gear. This means frequent and futile action will make time loss and to get tired. So the BPK makes you airily.
3) Both outer and inner CFRP (dry carbon) plates give you not only steady capability but also visually beautiful that makes you a sense of superiority. And you can choose cage color and pulley color as your preference.
4) You can use up to 32T rear gear with this short cage BPK.
5) You will experience an obvious distinction. Please enjoy to ride a bike with the BPK !!
PULLEY; 15T / 11T combination
AL 7075 machined
Sealed ceramic bearings are standard
Black, Gold or Red anodized
CAGE; Dry carbon twin plates 2 mm thickness,
FIT; Shimano R9100/R9150/R8000
CAGE COLOR; Matte / Clear
PULLEY COLOR; Black / Gold / Red
Full ceramic bearings are selectable +6,000JPY
*Derailer is not included.
*Chain link might be added as combination of gears.
*You should ask skilled mechanic to install it.
More details,,, Click below
CDJ BIG PULLEY KIT ENGLISH SITE