I'd say

the smaller the angle...

acute angle is definitely wrong. this is a "spitzer winkel"; an angle below 90 deg.

also, in german you don't call it a falcher but a stumpfer winkel.

small'd also be acute...

http://www.motorradseiten.at/old/technik-geom...
Die Größe des Lenkkopfwinkels bestimmt den fahrwerklichen Charakter eines Motorrades. Ein flacher Winkel erhöht die Drehfreudigkeit des Lenkers, und somit die Wendigkeit eines Motorrades, auch bei größeren Vorderradbelastungen.

@Sarge: I don't know aboout you, but I've never seen a rake on a mototcycle with an obtuse angle; that thing would be unrideable. A "flacher Winkel," as I understand it, is an acute angle, like you would have in a motorcycle's neck rake.

obtuse is an angle >90, not less.

acute is an angle <90.<br/>