[GraphHopper] Weighting for bicycle routing

[XCTrails]

Hi,

what is the default weighting approach for bicycle routing? A user has
recently pointed out that in a certain case he gets routed via main roads
while there are available bike trails. Case in point is from Bad Aibling to
Bad Feilnbach - GH's bicycle routing is basically the faster/shorter
connection, while http://cycle.travel/map for instance finds the "proper"
bicycle connection (i.e. the one I'd actually prefer)

What is the best way to influence this in GH? Implement a custom weighting?
https://github.com/graphhopper/graphhopper/issues/190 seems to indicate
that this should somehow be possible, but I'm not reading much out of that
ticket which gives me further clues...

(I do understand that there is a threshold issue, i.e. how far is one
willing to detour in order to avoid highways for instance...)

Thanks for any further hints or pointers...

cheers,
Armin
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