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They have done more than that. By having the "gear teeth" be bearings, it is probably slicker than well designed involute gears (like in your car). The "tooth" rolls with the passing cog-notch in this case.

That is super cool, but I think you lose a great deal of efficiency just changing angle in power transfer like that. This transfers power at 90 degrees, while a chain is straight. But I want one anyway if they make them! And UCI was concerned about spinning disc rotors! ;)

All Cruzbikes use 1 1/8 headsets don't they? So you could totally mix-and-match. Gluing clamping a long stem in the end of the tube should as stiff as the slider tube junction if done properly. I was going to stiffen that up to by extending the slider tube towards the bottom bracket as far as...

Hi Mark, The first tube I got off Amazon was so close, but ended up binding. I had to order one from a metal supply place. Hopefully it'll work this time. It'll actually end up with an OD of 38.1. I have some clamps on the way too. Anyway. I'll be able to prototype on my old Sofrider. It has...

It looks like it would be relatively trivial to set it to negative steering angle with that setup, and a little redesign too! :)

I think I have a stem that is the right diameter to clamp into the end of the tube if I cut the steerer-clamp off of it. That would look much nicer, I think. I bought a 1 foot section of 16 gauge 38mm OD T6 for initial testing. The very lower part of the boom on my Sofrider, before it tapers...

I have not found a one yet. The lower section of the boom on my Sofrider, before it tapers-down, is 34.9. I'll start by testing a 38mm ID tube over that. That'll let me know if it's worth persuing further. Pretty sure some other companies made 1.5 steerers. Hard to find though. I'm going to...

I'm really considering it now. I like the T50 a lot for its simplicity. I like the silver hardware you chose. Doesn't show scratches. Maybe a nice yellow frame with silver. Hmmm...... I better start saving a bit for it! Cannondale headshock stems were made for 1.5 inch (38mm) steerer.

The other idea that brings to mind for me is if you can use a 38mm tube as the slider. Those clamps are available for 34.9 seatposts as well...

Finding the clamp that works is the most significant update to this mod I have seen. Previous clamps only gripped half the slider, letting it slip. This one wraps around the whole tube, so it will hold far more securely (like the Cruzbike part). What a great coincidence on the spacing of the...

Very cool! :) I bet you could also flip the top seat post collar around so the tension bolt would be outside the plates, but on the other side. This seems like maybe a better direction then putting the Q45 boom on the T50. It keeps the regular dropouts.