I am a longtime BB7 user, who is going to finally switch to hydros. From what I see- hydros need to have a plastic spacer inserted, when the wheels are removed,to prevent the pads from sticking completely together. I am not used to this, since my BB7 mechanicals have a comfortable gap between the rotor and pad surfaces. Does this constant pad contact on hydros mean constant, light friction, seriously affecting rolling resistsnce too? TIA....