Just talked to Bill at BVC racing, GREAT guy to speak with. Seems like when I upgrade my stem, usually oversized clamps will come with it for the fat bar upgrade. Learned a little bit from this guy. Also he stated that where the bars start to taper, that's when the "Fatty" comes in. The 1''1/8 thickness is more in the center of the bars, then towards the outer section, the standard thickness is used.