free cup on bottom bracket
Is the free cup always meant to screw all the way in? I'm pretty sure it is not cross-threaded.
Neither rain, snow...
(edit: information applies to cup-and-cone BBs, disregard if cartridge)
Free cup? I presume you mean the adjustable cup.
It shouldn't screw all the way in - the bearings should stop it. There needs to be enough thread exposed for the lockring to use.
"You have succeeded in life when all you really want is only what you really need."
There has been some discussion on the topic already here. I think that the consensus would be that this cup acts merely as a support for the proper positioning of the BB, and therefore the fact that a few threads are showing means little. Certainly I have this on one of my bikes and have found no problem with it.
I do wish however that they would change the crappy plastic cups to metal, and save us from the inevitable deterioration of the plastic and them breaking during removal.
It's not clear to me whether we're talking cup and loose ball or cartridge. dsm assumes you've got an older cup and ball BB, while onbike is referring to cartridge. I agree with both of them, although I've had cartridge BB's where the NDS cup is important for holding the cartridge in place. If it wasn't cranked down and teflon taped, it creaked.
All of the higher line Shimano cartridge bottom brackets I've owned or worked on (UN-7X and some UN-5X) came with metal non-drive side cups. I replaced the few plastic cups (that broke) with metal ones that I've been able to get as replacement metal cups from my LBS. There was little or no charge as they have a bunch of take-offs from replaced bottom brackets.
Originally Posted by onbike 1939
I'm not sure what type of cup Shimano is providing with their current square taper bb's but all of the Octalink bbs come with metal nds cups too.
My Shimano UN-5x and -7x both came with plastic NDS cups. I hate them.
When were these purchased? Years ago or recently? I hated them too but, as mentioned above, most of the ones I've worked on had metal cups.
Originally Posted by tellyho
I bought a UN-73 a couple months ago, it has a plastic cup-
Originally Posted by HillRider
Originally Posted by well biked