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This works wonderfully with chainstays not attached to the bike, much more problematic if the chainstays are attached to the BB, as the other chainstay will cause serious problems for getting a vice jaw behind. Not impossible, but dependent on the bike and some brain power. Also much trickier for chainstay clearance than tyre clearance on complete bikes, as you're that much closer to the narrower end of stays.
Can't believe nobody has suggested making a dimple in the chainstay with a vice:
http://forums.mtbr.com/frame-building/chain-stays-dimples-wide-tires-801354.html#post9501052