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I have a bike with a GX BB, its done about 2k miles and has already had a new BB.
The second one has got a rough feeling when you spin and I had a look to see if there were removable races to re-ack with grease
Unfortunately, I was not sure if it could be done so I re-oiled and put back.
There was a clip type bit of metal on the outside of the race which might come off to allow access to the races - has anyone managed this?
Also as they seem short lived, is a Shimano XT BB a straight swap if GX cranks are fitted?
Many thanks for any pointers!
The sealing is so shit that I wouldn’t even bother. To use a Shimano BB you’ll need to get an adapter (off eBay), even then it technically shouldn’t work but seems to do just fine. Other GXP alternatives are available from Uberbike, Hope, Praxis and probably some others
The metal ring holds the bearing in from memory. Use a small flat head screwdriver to remove it. You'll then be able to prise off the bearing seal and re greace.
In my opinion it's pretty much essential that you do pop the seals and re pack with grease a couple of times a year.
I have a GXP BB on my hardtail for 3 years which mainly get used in the slop, and it's stil going fine.
I get the feeling those that complain about the the longevity of the Sram BB's maybe just don't look after them. It was less than £20,
I get the feeling those that complain about the the longevity of the Sram BB’s maybe just don’t look after them
Nope - get the same attention and care as other BBs. That's with that particular bike being a road bike and getting less use as well. They (GXP) are still shit. Now where's that Hambini video ...
I get the feeling those that complain about the the longevity of the Sram BB’s maybe just don’t look after them
Looking after a part that’s meant to be zero maintenance? Don’t think the problem there is the user
I've just removed mine and done just this. Screwdriver/blade to remove circles type metal ring, carefully remove rubber seal, sprayed in GT85 from back and span it al lot wihich breaks done the old grease and flushes it out. Clean/dry with tissue, then overpack with grease, giving it a few spins and replace seal etc.
OP - GXP BBs are slightly different internal sizes on each side. The adaptors mentioned is a reducer ring to bring the larger side down to the standard Shimano/HT2 size.
I've got Hope BBs that have lasted 5-6 years without attention, while lucky to get a year from SRAM.
Other way round. Adapters bring the 22mm NDS GXP axle up to the 24mm for Shimano.
It's a bit of a bodge as GXP clamps the axle to the NDS bearing and floats in the DS, whereas HT2 preloads against both. So as mentioned above, it shouldn't work because you're clamping against a bearing designed to be preloaded from one side only.
In practice, it may not work any worse than GXP does in the first place, and HT2 replacements are cheaper.
Never bothered to pull the metal circlip off, just flick the seal off with a scalpel.
I get 6 months out of a sram bb before it expires, bit more if I remember to re-grease it every couple of months.
Will be swapping over to XT M8100 as the drivetrains wear out, shimano bb's are better sealed and bearings better too.
The SRAM service manual used to describe servicing of GXP bottom brackets (page 6 here) but I can't see an equivalent for the newer DUB stuff - the user manual (p25) now says "Replace the bottom bracket when it no
longer rotates smoothly. ".
I would try following the same procedure as GXP and see how you get on...
Dub and gxp are best repacked from new. Dub in particular don't seem to be that well filled in the first place.
I certainly wouldn't go out my way to put one on a bike, but in my experience they are perfectly serviceable with some piss easy maintenance. My other bike has a hope BB and I still pop the seals on that every so often to put grease in..not a big deal.
Well I stand corrected on my previous maintenance statement! Got to wonder what made them think that was a good idea when they’re big competitor is maintenance free
Yak, how straightforward is it o repack a dub bottom bracket? Is it still as simple as removing the dust covers by hand and popping the bearing seals?
......replied to wrong thread
enigmas- yes. Well prise the dust cover off carefully with a thin flat blade or similar tool as it is a top hat thing with a little retaining lip and then you get to the bearing. To put the dust cover back at the end put it upturned on a flat surface and push the bb onto it and it will pop on in one go.