At this point it seems more like Fang wouldn't actually be "Super" so much as just using his bike in place of a Super Form. Also, a constant ring drain would just loop back around to the same problem they are avoiding of encouraging players to go fast.
However, say for example the bike only loses rings while moving, and at max
"running" speed only loses, say, 1 ring every 3 seconds or something. The ring drain would technically still be there, but the player would be more in control of it and would feel less pressured to actively seek out rings.
This is also why I was curious of if it would be possible to make the bike invincible, but not Fang himself. It would be much easier to abuse the invincibility since collecting rings would be less of a thing the player has to pay attention to, but if it's still possible to get hit and lose all your rings if hit from a certain angle, the player would still have reason to be careful since entirely running out of rings from getting hit would cause them to lose the bike.
It would basically be a tradeoff of having a vulnerable spot in exchange for more control over the ring drain. I'm not sure how possible that would be to implement though.