*As shipped, this bottom bracket is compatible with all Shimano
Hollowtech 2 mountain cranksets. Cup dimensions and spacers used correspond directly with the HT2 standard. Includes
3 pcs 2.5mm aluminum cup spacers to cover 68mm and 73mm BB shell standards, with or without chain guides or E-mount derailleurs.
This bottom bracket is also compatible with Race Face X-type cranksets and FSA mountain cranksets with with 24mm OD spindles
that do NOT have the "Light" designation.
"XD-15" ROAD* BOTTOM BRACKET...$199.00
*As shipped, this BB is compatible with all Shimano
Hollowtech 2 road cranksets and FSA road cranksets EXCEPT K-Force Light, SL-K Light, and SL-K Pro. GXP specific versions
(SRAM, TruVativ, etc.) are available separately.
ITALIAN THREAD "XD-15" ROAD* BOTTOM
VERSION SPECIFIC TO USE ON FRAMES WITH ITALIAN THREADED 70MM
WIDE BOTTOM BRACKET SHELLS.
*As shipped, this BB is compatible with all Shimano Hollowtech 2 road cranksets and FSA road cranksets EXCEPT K-Force
Light, SL-K Light, and SL-K Pro.
The XD-15 bottom bracket is the fastest and toughest bottom bracket in the
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.
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.
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.
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