Here's how we straighten them back out in a hurry, or make "taco-ed" bike wheels from the bike shop's dumpster usable again.
This wheel is pretty bent. Notice how the joint is even coming apart.
Pix by Star
Step 1: Find a Hole
As they say in Venezuela, "En tiempo de guerra, Cualquier hueco es trinchera."
I guess the city is planning to plant a tree here. In the meantime it's a good place to fix a wheel. Here I am uncovering the hole. Remember to cover it up again, this is a litigious society.
Step 2: Do the Stomp
Just go for it and stomp it flat.
Extra points for yelling and gesturing.
Step 3: Overbend
So you have to bend it a little further than straight.
Put one or more sticks under the low spots and stomp again, a little more carefully this time.
After a bit of this the wheel will be mostly straight.
Step 4: Spin and Eyeball it
You can mark them on the side with a pencil if you want.