GideonReade wrote: ↑24 Jan 2022, 9:26am
..but "pedals" are under the sole of the shoe, the thickness of it away from your foot: The two-bolt SPDs have a big lump of metal - the cleat's supporting plate - recessed into the sole, and bolted to an external heatsink. And for obvious practical reasons, designs may leave only a very thin layer of sole/insole over that plate.
So there's a sort-of 3-layer sandwich here, right?
A) Inner plate - metal (with 2 threaded holes)
B) shoe sole - mostly plastic? (perhaps CF-impregnated if you're fancy)
C) cleat - some other metal (with 2 holes in for the screws)
You then have 2 bolts - with 6mm shafts - connecting A) to C).
I think this means all of this "extra" heat-loss is being conducted through those 2 x 6mm diameter bolts.
My gut instinct is that this is a very ineffective design for a heat-sink, and will not be a big factor.
However, the sums aren't complex if you understand heat transfer; so please calculate an actual figure to show that my instinct is wrong.