On Thu, 23 Apr 2020 at 03:03, brad <bradha...@fastmail.com> wrote: > I've never seen an official IMBA rating on a sign. >
I have, https://wiki.openstreetmap.org/w/images/9/96/Serrata_Mountain_Bike_Track_Board_Map.jpeg > I see both mtb:scale and mtb:scale:imba both used. The wiki for > mtb:scale doesn't make sense. It's either skewed for extremely extreme > riding or they don't understand gradient. It says that for mtb:scale=1, > gradient<40%. This is meaningless. Nobody can ride up an unpaved grade > that is 40%, or probably even 30%. A steep trail is 15%. A really > steep, almost unrideable, very difficult hiking, trail is 20%. Going > downhill, anything above 25% is a double black, only a small percentage of > riders can ride, unless it is very smooth with really good traction. > I agree, I find it very hard to set mtb:scale confidently based on the descriptions on the wiki. In my opinion, mtb:scale:imba could be deprecated, and the wiki for > mtb:scale updated & clarified. > I would disagree on that, mtb:scale:imba is still useful to mark officially signposted or designated ratings of the track made according to the IMBA system, like in the first photo I posted. I'd be very keen to review any improvements to mtb:scale though, I have very low confidence in all the ones I've tagged so far as I feel like every time I read the wiki I have a different opinion
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