What size are your joists? I assume you are talking about the 2 by's on edge that run across the width of the garage. I your garage has a peaked roof (gable) then I would guess they are 2x6's. Now we come to the clear span or unsupported length of those joists. What is it?
Not knowing the specifics, this is what I would do. Take a 4' long 2x4 and saw it in half. Take one half and lay it across 4 of the joists above your bike. Nail in it place with two nails into any of the joists. Then lay the other on top of that and nail it in place. If you now put your ratchet strap or sling or rope in the middle of the doubled 2x4's you will have 4 joists sharing the load - plenty even if the joists are the width of your single car garage. I would never 'kick' the support out from under a suspended load. The sudden imposition of weight on the supporting structure could bring the house down (so to speak). Use the ratchet straps and keep an ear open for creaks and cracks and watch the beam for sagging.
Better yet, spend $30 for Harbor Freight's mini floor jack that will lift 2 tons. It weighs 20# and you can use it for other jobs.
Not knowing the specifics, this is what I would do. Take a 4' long 2x4 and saw it in half. Take one half and lay it across 4 of the joists above your bike. Nail in it place with two nails into any of the joists. Then lay the other on top of that and nail it in place. If you now put your ratchet strap or sling or rope in the middle of the doubled 2x4's you will have 4 joists sharing the load - plenty even if the joists are the width of your single car garage. I would never 'kick' the support out from under a suspended load. The sudden imposition of weight on the supporting structure could bring the house down (so to speak). Use the ratchet straps and keep an ear open for creaks and cracks and watch the beam for sagging.
Better yet, spend $30 for Harbor Freight's mini floor jack that will lift 2 tons. It weighs 20# and you can use it for other jobs.
