Specialized OSBB is the term used by Specialized on many of their frames. Unfortunately, this doesn't tell us much about the specific dimensions of the BB ...
Alloy OSBB mountain frames have a 42mm inside diameter BB shell with a 84.5mm width. This is much wider than a normal BB30 system. If looking to run 22mm/24mm ( ...
The BBInfinite Specialized OSBB Bottom Bracket module works with all 30mm spindle cranksets on the market, such as the stock FACT/Sworks crankset, Campagnolo ...
The short answer is OSBB comes in 3 variants which are all called OSBB. 46×61, 42×68 and 46×73. A summary table is below, with the detailed drawings below that.