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I have a bunch of extra doodooed up space marine bikes, and I wanted to customize a squad of unicycling ork bikers.

What size base should I use to keep these guys legal for games since I know lengthwise, they'll be way shorter than the bikes that orks have now?

You could use the standard bike bases, but just make them scenic! Have one of your unicyclers ramping up off of a big rock or something.

yeah, either make the bases bike-sized, or make the unicycle gunz bike-length, or maybe battering rams and exhaust pipes to make them bike-length?