As far as I know, the "spacers" you're talking about are actually "races" for the oil seals in the rear wheel hub to run on and they are the same length. It depends on the noise your brake is making as to the severity of the problem. If it's a small noise, it's probably common. Your rear wheel hub is set up to have just a bit of "end play" in the bearings. It must have this end play in order to prevent the wheel from locking up as the bearings heat up. It is set by a shim stack inside the hub. Due to this "end play", when you lean into a turn, the wheel moves a bit. Since disc brakes keep the pads against the rotor with a slight pressure, you will hear a rubbing noise. You could take the bolts that hold the rear brake caliper on and make sure they have a bit of synthetic brake lubricant on them so that the caliper moves in and out easily, floats so to speak. Also, if you have gotten any contaminant on the brake rotor like wax or something, this will cause the brake pads to squeal and they may even do it when you go into a turn. If the noise is really loud, do not ride the bike until you have it professionally checked out.
Good Luck
Steve
With the larger outside diameter on the outboard side hold the external spacer between the belt sprocket and the rear swingarm and then slide the axle through left side of the swingarm, the external spacer and the belt sprocket into wheel hub and then when the axle emerges from the hub on the brake disc side of the wheel, push the axle through the short external spacer, the brake caliper bracket and the right side of the rear swingarm.
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