You can get shims that allow you to set the cleat back by a significant distance, for both three bolt and speedplay now. Don't know the brand but my bike fitter said that it was somewhere in Switzerland that had started making them, maybe worth seeing if any local bikefitters have any of them they could sell to you so you can get the empires?

There's places that custom drill shoes for Speedplay. Just ship them your old pair and new pair of shoes. Or you can do it yourself after running a shim for a while that allows more rearward position.

The DIY option just makes cleat swaps take 5min longer fiddling with it.

Here you have them:

https://mid-foot-cycling.com/

Jeroen

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Owner at TRIPRO, The Netherlands

Thanks Jeroen. I already have the Speedplay extended plate, but it "only" allows an additional 14 mm while the Mid-Foot Ergo and Comp adapters provide up to 24 mm of rearward adjustment. Do you know if the Ergo and Comp also come with shims to match the curvature of the bottom of the shoe? Is the Speedplay adapter that converts 3-bolt to 4-bolt is also needed in addition to the Ergo or Comp (so increasing stack a bit)? Do you know of any places in the United States that supply the Ergo or Comp or is all ordering through their website? Thanks again!

The adapter plates already are 'curved' to match most soles of the shoes. I can remember there was a piece added that you could use to fill an potential gap but we didn't need to.
If you use speedsplay you still need the adapter plate from them as well as the rearward plates are 3 bolt pattern.

Jeroen

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Owner at TRIPRO, The Netherlands

I'm in the US and ordered through their website recently (didn't find any other options). Don't remember the actual shipping time but it was quicker than I expected.

I purchased a pair of used Bont shoes here on ST that had a set of more forward holes drilled. The little threaded bits (apparently Bont makes them and they're called "cleat nuts") that went into them just have "teeth" that grab the inner sole of the shoe when a cleat bolt is mounted into them. Seems like it would be quite an easy job to drill your own. The drilled holes don't need to be threaded themselves. They just need to fit the sleeve of the cleat nuts.

Would be a pretty easy job with basic drill for any carbon-plated shoe. Honestly, the holes don't even need to be accurately spaced, (at least for my Look cleats) given the wide adjustment range of the cleat to vary around the cleat bolts themselves.

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WIggle's house brand, DHB, makes one as well. Would be the cheapest on your list. I was able to pick up a pair last year on sale for ~$50 USD, but looks like they're a bit more expensive than that now. They're not the stiffest shoe, but I'm not doing criterium sprints, so they work for me.

https://www.wiggle.com/?s=DHB+Dorica

Edit to add that they're a bit of pain to get on with elastic laces because tongue slides down. I don't think this is any more of a problem than the other options though. This summer I might get around to cutting out the tongue before I start to race again.