Originally Posted by
Spoonrobot
I didn't see a link, is this the video?
https://www.youtube.com/watch?v=uHFSSXOSnxs
The video is not very clear but it appears they are trying to say disc brakes stop from 40 kph 3 meters sooner in the dry and 7 meters sooner in the wet?
I'm trying to find a measure of bicycle braking distance, I found this thread:
http://www.bikeforums.net/advocacy-s...-distance.html
Which seems to suggest that a difference of either 3 or 7 meters would be between 30%-50% difference in stopping distance.
You are way off there. The difference in dry conditions on smooth roads is zero. With gravel roads, the difference is two meters. With wet conditions on dry roads it's three meters.
I did a similar test myself on two bikes I have and it pretty much confirmed the results. If you ride on decent roads and it's not raining, the difference is minimal. This isn't on mountains but just flat to rolling roads.
The video shows the results a little less than halfway through