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@gbj_tester
It may have been me that said it, but it was specific to the Look 595. I would hope that Kalavinka had done their homework and determined the optimum gap, but either way the gap will be no more than about 1/2". Whatever the optimum gap might be, there is no need for an adjustment range of much over half and inch, as you'll going too far away from the optimum gap and should be changing the chain length to suit your gearing. It's hard to tell from the pix, but it look like the first inch of the slot is wasted anyway, because the tyre hits the tube if you move the wheel that far forward. I'm guessing the EBB is there to allow the frame to have different BB drops without having to use different moulds, not for chain tensioning.