Are Boundary cranks compatible with Schlumpf hub?

[MuniOrBust]

I am seeing most Spirit cranks are not available at UDC. Boundary cranks are now the KH offering. I don’t see how these would work on a Schlumpf. I remember KH was showing a prototype adapter, but I’m not seeing those for sale.

I emailed UDC and they said:

Yes, the Boundary cranks are compatible with the newest generation of Schlumpf hubs.

Oh? Is there a newer Schumpf since the 2023 ISIS model?

Either there’s an adapter, or I must buy ISIS cranks (Nimbus VCX?), or I’ve regressed to before my shape sorting toddler days.
Can someone help me?

[mindbalance]

Hey

Sadly that’s not true - not sure why UDC said that - unless @danger_uni does find a way to release this lovely little adapter:

Schlumpf 2022 Build Questions

Hey everyone - here’s an update on a prototype I’ve been testing for about half a year: an adaptor to fit microspline (Q-Axle compatible) cranks such as the KH Boundary crank to the most recent model ISIS KH/Schlumpf hub. Florian Schlumpf produced the prototype. It is deceptively simple and ingenious: a shim that is ISIS on the inside and microspline on the outside, with a different axle end bolt and shifter button. The rod-shaped shifter button looks like it would be harder to shift, but I’…

@jaco_flans do you think this might be something you can one day put on the order list?

UDC UK do have stock of Spirits and do ship internationally

https://www.unicycle.co.uk/product/kris-holm-spirit-isis-cranks/

EDIT - Jakob is also soon to release his own ISIS cranks so that might be the route here as they’ll no doubt be very Moment esque and ready for Schlumpfing

[jaco_flans]

@mindbalance

@jaco_flans do you think this might be something you can one day put on the order list?

EDIT - Jakob is also soon to release his own ISIS cranks so that might be the route here as they’ll no doubt be very Moment esque and ready for Schlumpfing

I do have the prototypes from Florian here. Kris has one set, I have the second one. I think the ones @danger_uni are using work, but they are far from optimal. I would say, not ready for sale yet. The protos are essentially a guess to get a taper for the ISIS splines. There would be no way to get the correct taper using the method what was used for the protos.

But yes I am about to share my new ISIS cranks. I am using the last proto, which should be the exact same as what I will be offering