Hi @shinobi20,
Welcome to the wonderful world of taking sports equipment on flights.
Each airline has a different policy and approach for this (see Putting bikes on Planes to/from Taiwan ).
For the official word from PR, the document would be: https://www.philippineairlines.com/en/~/media/files/downloadableforms/baggage%20general%20rules%20as%20of%2004jul17.pdf?la=en
which is found from: https://www.philippineairlines.com/en/travel%20information/beforeyoufly/baggage%20information/baggageallowance/baggageallowanceandfees
It’s pretty horrible reading, but if you want all the details, that’s where they live.
Also found (old, could be superseded)
Which seems to indicate that a bike can be included in your free baggage allowance.
Though, https://www.philippineairlines.com/TravelInformation/BeforeYouFly/BaggageInformation/SpecialBaggage/SportsEquipment indicates that you may need to “pre-book” sports equipment.
At this stage, I’d be giving PR a call to ask 