Trashzen 攀岩車網站對小攀岩車的說法:

Mod bikes
Mods are very bouncy and really designed for biketrial from scratch. So they are more reactive and you can maneuver and move your body around without feeling stretched. They are also more sturdy and can take more abuse (because of the integrated bashguard, the single-speed design with no rear-mech to trash, the smaller and stronger frame, stronger wheels...) Also, as a starter bike, a mod is probably more rewarding. The very short chainstay makes it very easy to hop and balance on the rear wheel. They are easier to sidehop with, even if it is to land randomly on the bash plate. They are lighter than stock bikes and tend to cost less too. They have no other use than riding trials (the very small gear ratio means you can't really use it to commute anywhere, like you could with a BMX), but they take less room if you are short of storage space.