FOR SRAM GXP CRANKSETS *BOTH BEARINGS
ARE ANGULAR CONTACT FOR 100% BALL ENGAGEMENT WHEN USED WITH INCLUDED WAVE WASHER.
contact bearings result in 100% ball engagement when pre-loaded. Chromium steel bearing races are given
Cryogenic Treatment after heat treating. The ball bearings are Grade 10 steel with nylon retainers.
The cartridges are ABEC 5 level precision. The sealed bearings are packed with an 80% fill
of Almagard Extra High Pressure grease. For future service, the bearings are easy to disassemble.
This press-in bottom bracket is designed for use on frames
with a BB shell inside diameter of 41mm. A 2.5mm cup spacer is included for use on frames with BB shells that are 89.5mm
wide. BB shells that are 92mm wide do not require the spacer. Because manufacturing tolerances vary, on many frames no special
tools will be necessary to install the cups as they will press in by hand. On frames with a tighter fit,
a mechanical means of pressing in the cups may be required.This can either be a dedicated tool for BB86/BB92
applications, or you may improvise with a threaded rod, nuts, and fender washers. A center seal where the two-halves meet
provides sealing from the inside of the frame.
Angular contact bearings are a step forward in outboard
bottom bracket design. Why? Deep groove radial ball bearing
cartridges are not designed to be "adjusted." Any inward or outward pressure
on the inner races put them out of alignment with the outer races,
forcing the balls to ride up the side of the groove and exerting greater
pressure on the races. This results in increased friction and premature wear. Since
almost all outboad crank sets exert some inward pressure on the bearings
when installed, it only makes sense to use a bearing designed specifically
for such loads.