"XD-15 PRESS-FIT BB30"

BOTTOM BRACKET
FOR BIKES WITH 46mm ID BB SHELLS
with ENDURO® "XD-15" CERAMIC HYBRID BEARINGS
 
$239.00
COMPLETE BOTTOM BRACKET:
 
ALUMINUM PRESS-FIT CUPS AND CENTER SLEELVE with XD-15 CERAMIC HYBRID BEARINGS
WAVE WASHERS
SPINDLE SPACERS
ANGULAR CONTACT DESIGN
HIGH-NITROGEN STEEL RACES
GRADE 3 CERAMIC BALL BEARINGS
MADE IN USA


HIGH NITROGEN STEEL CERAMIC HYBRID XD-15 PF30 BOTTOM BRACKET.... $239.00

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FOR FRAMES WITH 46mm INSIDE DIAMETER BOTTOM BRACKET SHELLS RUNNING BB30 CRANKSETS


Please note that that the Press-Fit BB30 is not compatible with the "classic" BB30 bottom bracket shell.  Standard "BB30" shells have an inside diameter of 42mm and the bearings press directly into the shell (no cups of any kind are used).  The Press Fit BB30 holds the bearings inside aluminum cups and requires a BB shell with an inside diameter of 46mm.  Both standard BB30 and Press-Fit BB30 bottom brackets are designed only for use with BB30 cranksets, which have a spindle diameter of 30mm.  This bottom bracket IS ALSO COMPATIBLE WITH THE CERVELO "BBRIGHT®"
 
 
 

ABOUT "XD-15" BEARINGS

 

The XD-15 bottom bracket is the fastest and toughest bottom bracket in the world.  

XD-15 High Nitrogen Steel Alloy is 3.5 times more corrosion resistant than 440C Stainless Steel.   In the past, ceramic hybrid bearing manufacturers were faced with a choice in bearing race material: 1) The longer fatigue life of SAE52100 bearing steel when paired with the extremely hard ceramic balls, or  2) The corrosion resistance of 440C stainless steel for use in harsh environments.   If they opted for the longer fatigue life of 52100 bearing steel, the intrusion of water would always be a threat to the races.  If they opted for 440C Stainless,  corrosion would become less of a threat at the expense of longevity.  The XD-15 steel not only combines the benefits of both, but EXCEEDS them on both counts.  Yes, much greater corrosion resistance than 440C and longer fatigue life than 52100 bearing steel.

XD-15 High Nitrogen Steel Alloy has a 40 percent higher load rating than SAE52100 bearing steel.  Ceramic hybrids made with 52100 steel races, while having a longer fatigue life than stainless, were still subject to premature wear when used with ceramic balls.  Of course the main claim of ceramic hybrids was less rolling resistance, resulting in greater speed and a more efficient transfer of the rider's output to actual forward momentum.  Wouldn't it be great to get this superior rolling quality while actually increasing longevity of the bearing?  Now you can.  XD-15 has an extremely fine grain structure which dramatically reduces the risk of failure under mechanical loading, lowers noise and vibration, and makes a perfect interface with ceramic balls.   Weak spots in bearing races due to grain structure flaws in traditional bearing metals are not present in XD-15, which has a homogeneous structure of finely dispersed carbonitrides, as opposed to large carbides concentrated at grain boundaries (which are vulnerable to corrosion and mechanical stressing). 

Grade 3 pure silicon nitride (SI3N4) ceramic balls are the best available.  These made-in-USA balls are Hot Isostatically Pressed (HIP) for a pore-free microstructure with micron-sized grains.  Reduced bearing friction from ceramic balls is a function of smooth surface finish.  The balls used in the XD-15 bottom bracket boast a surface finish of < 0.10 micro inch (< 0.003 micron). 

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 cranksets exert some inward pressure on the bearings when installed, it only makes sense to use a bearing designed specifically for such loads.  Likewise, the BB30 wave washer keeps pressure on the inner races of the bearings, making the angular contact design of the XD-15 ideal. 

 

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