Joined: May 2008
Posts: 10,106
Likes: 2,757
From: Fredericksburg, Va
Bikes: ? Proteous, '65 Frejus TDF, '73 Bottecchia Giro d'Italia, '83 Colnago Superissimo, '84 Trek 610, '84 Trek 760, '88 Pinarello Veneto, '88 De Rosa Pro, '89 Pinarello Montello, 'Litespeed Catalyst'94 Burley Duet, 97 Specialized RockHopper, 2010 Langster
IMHO use spacers. Lot less risk and effort. Forget safety except for making sure the axle is secured to the fork. There is no reason for the axle to come loose if properly tightened, unless you are a lawyer.
I personally dislike any so called "safety enhancements" as represented by this feature. They represent abdication of personal responsibility. The root-cause of highest risk to lack of safety are people.
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Bikes don't stand alone. They are two tired.