>>94438935"~6" tall riders would be CHUG Deluxe sized, but if you've been around this thread you'd know that very few 3Ps do TFs at that scale, much less bikeformers for them to ride. The most are KOs and oversized KOs, like this OSKO of Sqweeks from Weijiang.
That said, the Grooves and Wreckgars from official hastak work with figures that size from what I can tell.