Yes they will mess with the balancing, but there should be enough extra beads to offset that as well.I just bought the 250 kit, but I was wandering, I have a spike valve stem covers on front and rear, and they are pretty heavy duty, will this mess with ballancing of my tires with the dynabeads.
I have a slight bounce & vibration in the front at around that speed as well after I put my new tire on and removed the 4 old 1/4oz weights. I got the kit from you so I have another 2oz. pack left. I'm gonna take the old weights off the rear and put the beads in, hopefully that will take care of it.Rear tire can be causing the front to have a bounce. Dealer told me that. Mine did. I could see the front bounce a bit at about 72-75 mph and after I put my new rear tire on it was gone.

