why bottom bracket no go in?
#1
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why bottom bracket no go in?
I'm not too familiar with the different kinds of shell sizes, so I'm sorry if this is a dumb question. I have this bottom bracket. A bb7410 and I wasn't planning on using it for this build but it turned out to have the exact 103 mm spindle length that I needed for the right chain line, but as I tried to thread it into the early ages Fuji Monterey frame I realize that it seems slightly too large for that shell. Did I miss something? Is it meant for a bike with a different bottom bracket show? I don't want to force it but it really does not seem like it wants to even get in far enough to reach the threads so they can engage.
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You probably need to chase the threads in the frame. If it's english, it's english. It has to fit.
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If you're used to steel bottom bracket cups (especially for loose-ball bottom brackets), aluminum cups might feel a little tight. I think since it's a weaker material, they make them a tighter fit.
#4
Licensed Bike Geek
Italian threaded bottom bracket? The drive side threads seem to be righty-tighty
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#5
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Tried both sides both ways.
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I haven't run into this often, but on the couple of instances when I did, it was very off putting.
So take a good strong light, and look inside that BB shell, and see if you can figure out what's going on.
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#11
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...if it's an older production frame, and it's never had a cartridge BB unit in there before (only cup and cone, with a spindle and caged bearings,) sometimes they didn't bother to take back the protruding end of the (usually) seat tube, or (sometimes) down tube. They did this because it was extra work, and because, at the time, it didn't matter.
I haven't run into this often, but on the couple of instances when I did, it was very off putting.
So take a good strong light, and look inside that BB shell, and see if you can figure out what's going on.
I haven't run into this often, but on the couple of instances when I did, it was very off putting.
So take a good strong light, and look inside that BB shell, and see if you can figure out what's going on.
Nope. A Fuji frame will almost certainly have English thread. Either the threads in the shell need to be chased to clear out debris and corrosion, or you have the wrong thread spec cartridge. Are there markings on the cartridge indicating thread spec? English thread should be "1.37 x 24" while Italian thread will be "36 x 24." Dirty or corroded threads in the shell should at least allow the cups to begin to engage the threads. Italian thread is slightly larger diameter than English, and Italian thread cups won't even start to engage in an English thread shell.
I appreciate the help. I've not had to deal with sealed cartridge bottom brackets very much and almost never with any weird threading.
#12
Really Old Senior Member
Just above the bottom of the page has a chart-
https://www.sheldonbrown.com/bbsize.html
IF both cups have the same thread, it's NOT British (std) threading.
BB-7410 comes in Italian threading too.
https://velobase.com/ViewComponent.a...f9ab5&Enum=119
https://www.sheldonbrown.com/bbsize.html
IF both cups have the same thread, it's NOT British (std) threading.
BB-7410 comes in Italian threading too.
https://velobase.com/ViewComponent.a...f9ab5&Enum=119
#13
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Well, what do you know? It was right there. Not that I would've known what it meant until I started the thread anyway...
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#15
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Only question now is what to do with the Italian BB as I do not have any Italian bikes. It's a bit beat up although the action feels very smooth. I almost wish I had an Italian bike to put it in.
Last edited by cyrano138; 11-08-21 at 08:20 PM.
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second answer is put it in the the C&V for sale section (need to be a paid member)
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#17
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I posted it for sale in the single speed/fixed forum since that spindle length is mostly for track bikes I think ..
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Proper number of Bikes to own, where N = the current number of bikes you currently own
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Thank goodness you found the Italian marking first!
When you do get the right unit, 3alarmer 's observation about the BB shell threading may still apply. When installing a Velo-Orange cartridge unit in my '87 Bianchi, I had to file down some of the leading threads on the drive-side cup before it would go in all the way!
#23
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Thank goodness you found the Italian marking first!
When you do get the right unit, 3alarmer 's observation about the BB shell threading may still apply. When installing a Velo-Orange cartridge unit in my '87 Bianchi, I had to file down some of the leading threads on the drive-side cup before it would go in all the way!
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#25
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Nope. A Fuji frame will almost certainly have English thread. Either the threads in the shell need to be chased to clear out debris and corrosion, or you have the wrong thread spec cartridge. Are there markings on the cartridge indicating thread spec? English thread should be "1.37 x 24" while Italian thread will be "36 x 24." Dirty or corroded threads in the shell should at least allow the cups to begin to engage the threads. Italian thread is slightly larger diameter than English, and Italian thread cups won't even start to engage in an English thread shell.