splines

they are ridges on the ends of the axel. if you look at them from the
side, they look like a star with many points.

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happysquidman said:

*what are splines? i know they make the cranks and hub stronger, but
what are they? *

Here are some past threads that explain splines:
'Thread 1' (http://tinyurl.com/4fsj8)
'Thread 2' (http://tinyurl.com/2txjl)

And Steve Howard has some good pictures of splined cranks and hubs in
his gallery
'Steve Howard's gallery' (http://gallery.unicyclist.com/showard)
Specifically this gallery
'KH Style 8 Spline Hubs' (http://gallery.unicyclist.com/KH_style_hub)

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