im just curious of where the predictors from 30m comes from. because on my journal its said that a 4 flat off first movement for 30m is well sub 11 for the hundred, but if you take 4.00 for the first 30m, .15 for RT and then take a speed of 10 m/s (probably about what the fastest hs kids run at least) and assume perfect se, that still adds up to 11.15. seems like the charts are very sweked towards those with good top speed and not so good a start,eh?