• Oops, I had forgotten about silly Shimano bolt pattern. A 46t chainring seems to be nearly £100 :(

    If I size the chain for 50-40, is the worst case that it will be too loose if you cross chain in 34-11?

    The mech will collide with the cassette if there's too much slack. Take the chain off the chainrings and see what happens to the mech when you pull the chain through.

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