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Just measured, and I'm currently safe by all measures :-)
3cm - I'm pretty marginal and it's hard to measure if someone is shifting about on the bike but I make it 3cm exactly when I'm static.
leading edge - I just checked and I've got more space than I thought on the proper TT bike. Approx 10cm behind the leading edge of the wheel.
Wheel spindle - I'm about 22ish cm (8.5 inches) ahead of the wheel axle.
All of those measurements are taken with the gear shifter in the 11t position... if I shift to the 25t position then that adds another 3cm to my reach!
To be honest I've not really been following the debate. The 3cm rule seems to do a poor job currently, but I've not been keeping up with the relative pros and cons of alternative suggestions. My position isn't even that stretched out, it's just that the slvlss part of me likes the saddle slammed forwards to help me run after.
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ewanmac
@specialist 's proposal turns the 3cm rule into a 15cm+ rule. I'm advocating for 10" in front of the wheel spindle as the limit.