I don't know that it makes a difference. If anything having it further out on the rim will have the magnet go by faster which probably would improve the pick-up (faster motion ==> faster change in magnetic field ==> stronger induced current). "Speedo" reminds me of a funny commuting story. One day I'm three blocks from work getting an apple turnover at the local Italian deli run by a Korean guy named Lee. The large Italian woman who runs the checkout sees me and says "Lee! You see what that guy's wearing? THAT's a Speedo!". No joke. To her, bike shorts == "Speedo". What's funny to me also is that "Speedo" == a certain type of bathing suit in the US when it's no more than a brand name. Anyhow, if you're wondering, I'm now recognized as a regular at the deli and they don't mind if I roll my folder in there (time saver! don't have to fold).