I couldn't find the reason !!!

friends, I have a 2006 model 307 cc, while my vehicle is in motion, it sounds like a rubber balloon from the bottom, but I couldn't figure it out. Not from the axles because when I lift the wheels one by one, it sounds like it is from the middle part. What could it be?

Is there no friend to reply to: S

[QUOTE = 307bursa] I feel like we'll lie without hearing a difficult question [/ QUOTE]