Low-limit (big cog) are definitely a big deal, unless they can control the tolerances well enough that the hard mechanical limit of the parallelogram is always in the right place. It doesn't take much of a bump to the 'gram to push the cage beyond the big cog if the low-limit isn't doing the limiting properly. AXS handling the indexing won't help because it has the "magic" of releasing upon the exact impacts that would push a cage too far inboard if it's not already at the limit. I know the UDH design has the specs and tolerances needed, but since the bike industry, as a whole, couldn't get the specs and tolerances of pressfit BBs correct enough to make that superior solution actually viable after decades of trying, I have my doubts.
March 24, 2023, 11:23 a.m. - Justin White
Low-limit (big cog) are definitely a big deal, unless they can control the tolerances well enough that the hard mechanical limit of the parallelogram is always in the right place. It doesn't take much of a bump to the 'gram to push the cage beyond the big cog if the low-limit isn't doing the limiting properly. AXS handling the indexing won't help because it has the "magic" of releasing upon the exact impacts that would push a cage too far inboard if it's not already at the limit. I know the UDH design has the specs and tolerances needed, but since the bike industry, as a whole, couldn't get the specs and tolerances of pressfit BBs correct enough to make that superior solution actually viable after decades of trying, I have my doubts.