Insane Clown Posse Tourmates -- We Were Set Up!

The guys touring with Insane Clown Posse -- who were arrested last night for marijuana possession -- not only maintain they are innocent ... they claim they were set up!

As TMZ first reported, Jamie Spaniolo and Paul Methric (better known as the rap duo Twiztid) and Chris Rouleau (who raps under the name Blaze) were all busted for felony marijuana possession and possession of drug paraphernalia, a misdemeanor.

Methric (above, middle) tells TMZ the group was "set up and snitched on by a guy with a vendetta against them." He says the group is "not guilty" and their "lawyer will be fighting this in court to the full extent."