On Sat, 08 Sep 2007 08:42:58 +0100, Eiron wrote:

Andre Jute wrote:

Those brakes aren't dodgy, Don, they're hyper-competent; what I forgot
to add is that they have a built-in modulator. They stop the one-
eighth of a ton of me and the bike and light touring gear from thirty
kph in 11 feet. I know, because I chewed up a pair of tyres while I
practiced that one to perfection. But I agree with you, for casual use
those roller brakes are overkill.

A fat man on a granny bike braking at over 1g!
Don't the laws of physics apply in Eire these days?

Quite so. That comes out at 1.05g. Centre of mass combined with
wheelbase tell us that he performed the last 8 feet of that stop flat
on his face in the road. But that is a perfectly legitimate way of
stopping your bike.

Anyone who wants to do the sum the easy way just pop this

(30 kph)^2 / (2 * 11 ft) in g

into Google. I rarely use an other calculator these days.

d

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Pearce Consulting
http://www.pearce.uk.com