On my half recumbent tandem, there is no stem on the front steerer tube. I would like to change the upper cup of the headset (related question Play in headset with no upper bearings on a tandem bicycle). But the stack for my new headset is a little higher than the previous one, and there is not much clearance between the top of the headset and the front seat.
- Since there is no stem to secure the fork in place, there is a kind of lock ring with a bolt to do it. This is my understanding of how this system works. Am I right ? Is this lock ring really necessary ? (I'm pretty sure it is so but it adds to the height of the headset).
- What would be the proper name for this kind of lock ring ? This design is not rare on cargo bikes, but when I look online to buy that kind of lock ring, I find only one model, and my use case (securing the fork when there is no stem) is not listed in the product description (https://problemsolversbike.com/products/headset/locking_spacer_-_6788).