Solved
Where'd this bike come from?
Which pack gives you bikes? Cause I'm pretty sure I don't own it. My sim has gotten a number of usual things while dumpster diving in the dumpster I placed on his home lot including the elusive myst...
Sims can get the Full Wood Jacket Bicycle whilst dumpster diving. It is the only way that you can get the bike. It doesn’t show up in build mode unless you use cheats.
If you own Eco Lifestyle pack, then your sim got it through dumpster diving.
