Honestly, if you don't want it, put in on CL with a $10 as-is sale price.
Don't throw it out. If you won't use it, someone else will. I buy up bikes like that all the time for $10-15. I tune them up and resell them for $40-60 (depending on the bike and how it turns out.)

It's just wasteful to throw it out when you could let someone else have it and get $10 for your bother.