In the book of Matthew, it says he rode two donkeys.

Matthew and Luke copy a lot of stuff from Mark, which was written first. The donkey story is there to fulfill prophesy. It was prophesied that the messiah would ride a donkey into Jerusalem. It also said he would be a king and vanquish their enemies and rule in peace and prosperity, but the New Testament authors figured riding a donkey was close enough.

So Matthew geta to the donkey story and reads the original prophesy. It says "Behold, your king is coming to you, humble, and mounted on a donkey, and on a colt, the foal of a donkey."

This is a poetic way of writing about a single donkey, like saying "he drove a car, he drove a red car."

But Matthew, frankly, fucked up a lot of stuff that he wrote, and he doesn't know this, so he changes everything to plural to fit the prophesy.

So everybody else writes that Jesus had his disciples bring a donkey and they lay their cloaks on it and he sits on it and rides to town. Matthew has them bring two, they lay their cloaks on them and he sits on them and rides to town.

It's unclear how he rode two donkeys. Was one donkey on top of the other and Jesus on top of that? Was it jean Claude van-damme style with him doing the splits between them?

At any rate, if the donkeys spread the load he could have weighed 160kg.

By the way, these donkeys are stolen. Jesus tells his disciples that there was a house back there that had a donkey (or two), go get it (them) for me.