I want to build my own dirt jumper, mostly using Octane One parts.

At this site, there's two versions of the wheel. An 15mm orbital and an 20mm orbital. What is the difference, and which is the most common?

  • If you want to do some different tricks, it used to be (50 years ago) that people would put, say, 24-inch rims on a 26-inch wheel, using spokes of varying length to produce a wheel that was off-center. I don't know that you could jump the thing very well, but you could, eg, get the bike to move by rocking back and forth. (You could probably also get sea-sick.) Commented Aug 30, 2015 at 12:14

1 Answer 1


Orbital is the brand name of the hub. 15mm and 20mm are different axle diameters, get the one that matches your fork.

Edit: Most dirt jumping, DH and freeride forks use 20mm, 15mm is a newer standard used mostly for cross country.

  • Thank you. I just realized some mtbs doesn't use the 'normal' quick release axel.
    – KaareZ
    Commented Aug 30, 2015 at 9:45

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