since you keep claiming that 30mm aluminium is noticeably stiffer than 24mm steel
You're right, my bad. I shouldn't have used the words steel and aluminium. You are better than me.
You are better than me
Seems unlikely.
Whatever you think you noticed when you changed from 105 to Praxis, it seems equally unlikely that the BB spindle diameter played any part in it.
@gbj_tester started
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You're right, my bad. I shouldn't have used the words steel and aluminium. You are better than me.