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I am pretty sure if well known the issues with the GXP external bearings that are inside the cups that come with the SRAM OMNIUM's that are quite popular in the fixed gear world.
Am I the only one that had a stroke reading this?
Anyway, the problem with the gxp system is that all the axial load is taken in the non drive side bearing. Most other bottom bracket systems share the axial load between both sides.
Proper facing of the shell and installation may well help prolong the life of the bearings but in my (and many, many other people’s) opinion, it’s a flawed system so anything you do is going to be fighting a losing battle.
Personally I don’t see using a bottom bracket like the Hope as as viable fix. The nds bearing in a gxp bb has a special elongated 22mm ID inner racer that gets held between the step in the axle and the crank arm. Using a spacer inside a 24mm bearing seems like a bodge to me and I don’t imagine that it can support the axial load as well as the original which, as above, is already a flawed way of doing it.
The step down in the axle to 22mm also probably means the nds bearing in a genuine gxp bb is using larger balls which would make sense since it’s supporting all the axial load. Using a spaced bearing means you are putting those loads into smaller bearings and that can’t be good.
I suspect the reason we don’t hear many people complaining about the longevity of the Hope bb is that there aren’t actually that many people using them.
M_V-
In my personal experience, when fitting my own GXP cranks, there is a little play in the crank arms even at 30nm+ and the required 40 just takes out the play as they get really tight which says to me that there's next to no axial load.
Now if your BB shell was 68.5 or 69mm wide which as you'll know is how they come from the supplier, the crank is going to be pressing on those bearings long before the 40nm required torque -
I really appreciate your knowledge and in my all humbleness, I came here to exactly seek for help. Thanks for that. I do not know how I caused you any stroke. If was due my shitty English, I am sorry but I am not Native and I didn't wanted to hurt your heart. If was due to anything I said, sorry but when you look up online, is a quite common issue with this setup, I didn't say anything wrong, is a common issue with a common setup. Coicidence? I don't think is a feature :)
PhilDAS
Fabzzzz
Hi guys,
I am pretty sure if well known the issues with the GXP external bearings that are inside the cups that come with the SRAM OMNIUM's that are quite popular in the fixed gear world.
I come down to the conclusion that the cheapest/easiest way to get the expected crackling noises that eventually they start to make, is in sum, replace the bearings in both sides (NDS and DS).
Anyone went through the same issues? How did you sorted that in a more permanently?
I am looking at best bearings without going too crazy with budget of course, shut out your links, I am all ears.
Thanks in advance