>>959250That reminds me of another advantage, most bottom brackets can go in 68mm or 73mm shells with the addition or removal of spacers. Also external bearings give the option of BB mounted chain guides, tensioners, and derailers.
>>959322>A UN72 will outlast even the best HT BB by thousands of miles.On a road bike, I'll take your word for that and let someone else correct you if it's false. For heavy use it doesn't matter how long the bearings last if the axle bends or the axle to crank arm interface gets fucked up.
>This isn't a good thing. It means you have no way to adjust the chainline properly if you wish to mix a MTB cranck with road equipmentDon't all HT II cranks have the same chainline, regardless of being road of MTB? If they are different you can adjust it with chainring spacers and BB shims. That said even if it is off it's not going to cause major issues, where as a too short square taper axle can mean it's completely unusable.
