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As far as tire levers go I’ve used spoons, made my own, and I’ve tried many from the market.  These seem to be the best so far. They’re nice and wide, they get in and grab the tire pretty well and their width is great ergonomically when you really have to wrestle with that tire. 

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As a tip: I file down the edges to fillet them.  This makes it easier on your hands when you really need to grip it.

http://www.pedros.com/levers.htm