BOTTOM BRACKET: American Classic UltraLight
Lighter than XTR, Dura-Ace, Record and all the other Ti bottom brackets on the market? You'd better believe it. The American Classic UltraLight is the lightest splined bottom bracket available, and it does this with a strong, durable chromoly axle. Double sealed bearings are widely spaced to handle higher loads. The unique design prevents bearing side load when you wrench in the cups. Best of all, the ISIS splined axle is substantially stronger and stiffer than a square taper axle.