Matching spd-sl position to spd

thetoecutter
thetoecutter Posts: 36
edited May 2018 in Road general
I am changing from spd to spd-sl pedals and shoes. I would be grateful of advice on how to match the position of the new spd-sl cleats to my existing spds.
Do I match to the leading edge of the cleat for both systems or the mid point or somewhere else? I'm not really sure where to start.
I can compare both shoes side to side to get started.

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