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I did 90km/h with 46/11.
On paper that mean I would have to do 172rpm.
I didn't, I just tuck into an aerodynamic position and glide the bike down the mountain.
Don't worry about the top speed, worry about your average and climbing speed, reckon you made the right call and you seemed to have enough information to decided.
edscoble
That's interesting, thanks. I looked at the relative speed at cadence, and figured I'd never even hit the 42mph which you'd get at 130rpm on 50x12, let alone the 46mph you'd get at the same cadence with the 11t!
Push it up to the potential 52x11, and that's 48mph.
I suppose if you're really hammering it down a long straight hill you'd easily reach those speeds though - again, Norfolk isn't exactly a hotbed of long descents, so I don't have much real world experience of them.