Hey thanks for your help. I have just bought a Harley & noble over the wheel Russian doll batt system (with no batt bins) It’s size 350mm and that’s the largest size it comes in, however the lip of the batt just doesn’t quite fit on my wheel head unfortunately. But it looks like the 350mm size is the only size I can find in the tile system! The wheel is from America however I can’t see this being different to any of the European Brent wheels.