Square taper crank and bottom bracket: fitting to a frame
#26
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Unfortunately, @tomtomtom123 is right. But I was thinking that the cheapest/easiest way to fix that problem is to put a 2.5mm thick washer in between the fixed cup and the pressed-in bearing.
BTW, I took this thing off of my other bike because I got sick of the NDS spontaneously tightening itself up. The lock-ring doesn't work very well. (Maybe I should chuck my $130 boutique BB and its new ceramic bearings into the trash and get the $13 Shimano special.)
BTW, I took this thing off of my other bike because I got sick of the NDS spontaneously tightening itself up. The lock-ring doesn't work very well. (Maybe I should chuck my $130 boutique BB and its new ceramic bearings into the trash and get the $13 Shimano special.)
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#27
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...now that I think about it, I have a pair of White Industries hubs that came to me on a used bike I bought. I could never make myself pay what they cost new. When I built them up into new wheels, it was quite troublesome pulling off the cassette cogs because they elected to use a lightweight aluminum freehub body, and the existing Shimano cogset had managed to cut some nice grooves and snags into the aluminum. Had to pry it off with prybars and file the keys smooth again to install new casette.
I'm certain that the things will probably go for a long time without any bearing issues, but it's a design choice that turned out to be problematic.
...now that I think about it, I have a pair of White Industries hubs that came to me on a used bike I bought. I could never make myself pay what they cost new. When I built them up into new wheels, it was quite troublesome pulling off the cassette cogs because they elected to use a lightweight aluminum freehub body, and the existing Shimano cogset had managed to cut some nice grooves and snags into the aluminum. Had to pry it off with prybars and file the keys smooth again to install new casette.
I'm certain that the things will probably go for a long time without any bearing issues, but it's a design choice that turned out to be problematic.
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#28
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I think it is titanium, but yes, this is a problem (and yes, I have two different wheelsets with WI hubs). Even my steel Chris King freehub body (yet another wheelset and bike) has this issue, which is why SRAM and finally Shimano (for their 12-speed stuff) ditched it.
Last edited by Cyclist0108; 12-08-19 at 10:31 PM. Reason: clarification
#29
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Since I had a 2.5mm spacer lying around, I put that on*. The good news is it solves the crank bolt issue. The bad news is that there is not enough of the thread exposed on the adjustable (non-drive-side) cup to put the lockring on. The spindle is 113 mm, so at least I know how much to size up now if I get a new square taper BB, but my growing hatred of square taper (which is why I took this off my custom bike and put on a GRX crankset) is making me think twice.
Some cartridge brackets - notably Shimano - have a flange on the NDS that limits how far you can thread it in. If you put a spacer on the drive side to move the cartridge over, this can prevent the NDS cup from securing the cartridge very well. Since Shimano cartridges have the flange, I'd recommend going with a longer spindle rather than using a spacer to offset. If you want a non-flanged BB, the Tange LN-3922 is a reasonably affordable option.
If you go with Shimano, I'd recommend a UN-55 instead of the ultra-cheap UN-26. The UN-26 gets into "corner cutting" territory, with questionable choices like a plastic NDS retaining cup. UN-55 is nothing fancy, but it's rock solid.
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#30
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Thanks.
I think I will get the UN-55 in 118 mm.
I put the WI one together with a washer inside the non drive-side cup, and it all works, but the idea of the asymmetry bugs me, and I can't seem to get the pre-load adjustment quite right (there is still a slight amount of play in it even when it starts to bind). I think I am ready to get rid of it in favor of the Shimano UN-55, or else just get a 46/30T GRX crank (which has been a flawless replacement of the WI crank/BB on my other bike).
Stupid WI crank was more expensive than the frame.
I think I will get the UN-55 in 118 mm.
I put the WI one together with a washer inside the non drive-side cup, and it all works, but the idea of the asymmetry bugs me, and I can't seem to get the pre-load adjustment quite right (there is still a slight amount of play in it even when it starts to bind). I think I am ready to get rid of it in favor of the Shimano UN-55, or else just get a 46/30T GRX crank (which has been a flawless replacement of the WI crank/BB on my other bike).
Stupid WI crank was more expensive than the frame.
Last edited by Cyclist0108; 12-06-19 at 04:26 PM.
#31
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Ordered. Thanks. (It was the one I already had picked out.)
#32
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The BB-UN55 arrived. Installed. This design is vastly superior to the >$100 White Industries version, and has the additional merit of being available in the correct size (118 mm is perfect).
Thanks to everyone who suggested it.
Thanks to everyone who suggested it.
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