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I've got about a dozen splined tools for removing BBs, cassettes, chainrings, etc, but none of them fit this! As it's their crank, I looked at E*Thirteen's site and it said a Shimano TL-FC39 (£60 @ Tredz!!) - bought one (ebay bargain: £35!). Way too big. So I've now ordered an ebay one that looks right. Is it?

What's the official tool?
Try the Park Tool LRT-4
Ah, thanks. Looks like the Shimano version is the
Shimano TL-FC41 huge font!
about a tenner! cheers 🙂
Depends which motor it is on....the newer shimano ep801 uses the LRT-4 or the more expensive shimano specific one at £60 !!!
Shimano Spares TL-FC430 chainring installation tool for chainring for DU-EP801 / DU-EP600
OMG there's more! It is a Shimano EP801 motor. I think the ebay one I've got on order is LRT-4 copy, so should be good.
I presume the number after the FC is the diameter of the lockring... why would they make a 41mm AND a 43mm? It's bleedin crazy!
'Standards'.... that's why
PArk list the "standards" Here. So the pic of the LRT-4 appers to match my setup... so if the bargain RISK tool I've ordered isn't right, then I know which one to splash the cash on. Pretty sure the RISK will be worth it though (Arf!).