A 6-inch G-clamp makes a decent bead breaker and only works on the tyre wall. After that you can hopefully take bigger bites using the rim protectors. Use the clamp to break the bead then hold a section fully down the well.
Remember, BMW don't want you to do this, want you to use their dealers, will do anything to save 0.000001 € per bike and don't want to fill in a thousand elf-n-safety forms related to green goo on the production line; they've fitted the tyres with no lube. If your tyre fitter put the new tyres on with soap it'll be easier next time.
Andy
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