if you have risers and can turn the front wheel all the way around then it usually has a smaller clearance from the frame that makes it easier to lock front wheel and frame together.
http://1.bp.blogspot.com/_O7NAx9ZtsLw/TKttLhFtUXI/AAAAAAAAB2M/cgOF-Gka_D4/s1600/bb17+charmer+barspin+clearance.JPG
@HatBeard started
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if you have risers and can turn the front wheel all the way around then it usually has a smaller clearance from the frame that makes it easier to lock front wheel and frame together.
http://1.bp.blogspot.com/_O7NAx9ZtsLw/TKttLhFtUXI/AAAAAAAAB2M/cgOF-Gka_D4/s1600/bb17+charmer+barspin+clearance.JPG