CDJ Big Pulley Kit (BPK) has some advantages.
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) We also offer you the Middle cage BPK which is suitable for wide range gear ratio as more than total capacity 33t. For example, to use 50/34t front, 11/32t rear that is 37t total capacity should be used the middle cage BPK. So you can choose it depending on where or how you ride.
5) You will experience an obvious distinction. Please enjoy to ride a bike with the BPK !!
This is the middle cage for wide gear ratio only.
Example ; FC:52x36 CS:11กม32 or more.
Normal ratio must be used standard cage.
PULLEY; 15T / 11T combination
AL 7075 machined
Black, Gold, Red anodized
CAGE; Dry carbon twin plates
2 mm thickness,
FIT; Shimano 7970/7900, 6770/6700
CAGE COLOR; Matte / Clear / Smoke Red / Smoke Blue
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