I had tried to model two-wheelers for a month, and I have made the model which is quite interesting, and Adams's view has no problems to simulate it and works fine. I have used tire model 'pac_mc_120_70R17_cross.tir' for both front and rear wheel where road profile is '3d_bump.rdf'. But the problem that I am currently facing is a warning message in the message window. It says, Long. slip exceeds validity range. And also the front wheel has no rotation motion at all. But If I remove the motorcycle chain, the front wheel will begin to rotate as the bike moves forward. Is there something that I missed because I don't have much experience in ADAMS.