NINER ENCYCLOPEDIA
>>
SPECIFICATION & SETUP GUIDE
43
: Updated: SEPT 5, 2012
BB30 AND PF30 EXPLAINED
THE ADVANTAGES TO USING A 30MM CRANK SPINDLE
The various BB30 systems are named for the diameter of the crank
spindle. Compared to the standard 24mm spindle, a 30mm spindle can
be made from aluminum rather than steel and offers increased stiffness
with lower weight. Larger sealed cartridge bearings can offer increased
durability over smaller units. The larger BB shell works well with purpose-
shaped frame tubes that contribute greatly to frame strength.
SRAM PF30 (PRESS FIT 30)
Niner’s Jet 9 RDO and new Air 9 frames use SRAM’s PF30 bottom bracket
standard. This system is not only light and stiff, it is also very easy to
install. The PF30 bottom bracket uses nylon bearing cups that press into
a 46mm bottom bracket shell. PF30 is compatible with any BB30 MTB
crankset without adapters or modification.
COMPATIBILITY
What if you don’t want to buy a BB30 crankset? SRAM offers an adapter
that inserts in the PF30 shell and allows the installation of a standard
threaded external cup bottom bracket. This adapter is compatible with
standard threaded Shimano, SRAM/Truvativ GXP, FSA and Race Face
bottom brackets and 24mm spindle cranksets. Your Niner dealer can order
this adapter from any SRAM distributor.
PLEASE FOLLOW BB INSTRUCTIONS CAREFULLY WHEN USING THE
PF30 ADAPTER. INCORRECT BB SPACER PLACEMENT CAN CAUSE
DAMAGE TO YOUR NINER THAT IS NOT COVERED BY WARRANTY!
ABOUT AFTERMARKET PF30 EBB UNITS
There are currently eccentric bottom bracket (EBB) units available from
several sources that are compatible with PF30 bottom bracket shells.
While these are approved for use with our alumnium frames, the clamping
force could damage or destroy the bottom bracket shells of our carbon
frames.
DO NOT USE AFTERMARKET PF30 EBB UNITS WITH
CARBON NINER FRAMES!
The bearings and press-fit plastic cups of the PF30 system
The PF30 to BSA adaptor, showing the threads that allow the use of standard external
bearing BB units.
