Re: Why chain whips aren't 1/8" (and eventually, why they wouldn't be 3/32" if 10sp were to ultimately conquer the world)
Some cassettes, notably DA and Campy 10sp use 11/128" spacing to accomodate for the number of cogs on the cassette. A 3/32" chainwhip wouldn't even fit between the cog spacing, although that's not even how I would remove a cassette. I always put the chainwhip on the largest cog, so I get the greatest distribution of force between the lockring removal tool, its accompanying wrench, and the chain whip.