[sorry for any confusion… edited for clarification]
For whatever it’s worth, I found only 2 instances of 自転車 used with する via gr.jp, and they are in the form “自転車にする”. The two instances come from books, one published in 1984, the other in 1999. There are no instances of 自転車する or 自転車をする, which are the forms you might expect for “to bicycle” if that was a common form.
Compare that to 314 instances of 自転車に乗* and 6 instances of 自転車を乗*
Thanks for this!
Yeah, I was expecting 自転車する, as if bike could stand nearly on it’s own like other する verbs. Thanks for clearing this up… My that’s quite infrequent!