Shimano Hollow Tech 2 bottom bracket. How long does yours last?
Definitely a ‘how long is a piece of string question’Posted 5 years ago
So many variables it is impossible to be accurate assessing how long a BB wil last. On one bike an XTR has lasted 2 years and is going strong while the deore it replaced lasted 6 months. On the other bike an XT has lasted 3 years , still fine. However you are going to get people posting who can’t make an XTR last very long and insist on buying more expensive BBs. Impossible to callJolly Green GiantMember
What druidh said.I killed one in 3 rides from over tightening. 😳
Now I`m very careful they last a year or more,but water in the seals kills them so try to avoid pointing a hose near it,and try to dry it out if you get it wet.
I have removed the top hat seals from dead ones and you can see how corroded the bearings get from water ingress.
I have eked out a bit of extra life by removing the top hat seal,cleaning,repacking with grease and re-assembling but it is a short lived cure before they get really grumbly.Posted 5 years agofuzzheadMember
The last one I had lasted a year (Saint), but the prior one (another Saint) lasted a good couple of years.
As above, it’s a piece of string question, but I think the last one got battered due to being ridden more/harder so didn’t last as long as the one before.
IME Shimano BBs are pretty durable, RaceFace bbs on the other hand… 😉Posted 5 years agoNorthwindSubscriber
I mangled a Deore one in I think 3 days on the DH bike 😳 Bearings damaged rather than seized, hadn’t seen that before.
SLX/XT in all the other bikes and they last very well. XTR cranks having a fixed torque setting rather than “sorta tightish” possibly helps me with that…
One in the hardtail sees the worst conditions, it’s probably due a replacement now but it was new when I got my 3rd Mmmbop which was about 2 years ago, I think.Posted 5 years agoircSubscriber
Around 10’000 loaded touring miles on the Deore BB on my Long Haul Trucker. Even then it was still usable, the driveside was fine, the LH side a bit rough. I replaced it when I replaced the whole crankset.
Most of those miles, about 8000, were in the USA and only included a few days of rain on a bike with a full set of mudguards. so it seems poor fitting and water reduce the life. In UK conditions you can only do much about one of those factors.Posted 5 years agoperthmtbMember
Don’t know why people get so wound up about BBs not lasting – they take a lot of stick, and in fact I’m surprised they last as well as they do!
I now treat them as a consumable, and just like chains, cassettes, tyres, suspension seals – mine get changed at the annual service. Afterall, buy off one of the German online shops and they are about the cost of a chain, and we don’t whinge about changing them every so often…Posted 5 years agolesoxdhMember
The question is how long does your last?
Reason behind my question is, that last September I replaced my Shimano XT HT2 bottom bracket with another Shimano XT replacement. The first one lasted 3 years before needing to be replaced.
I have to say that I have done over double the amount of riding over the last year and also now have Woburn as my local trails. Do I just take it that it has been a very wet year and now riding in a sand pit, has made it last only a year.Posted 5 years agomartinhutchSubscriber
My Deore has lasted about a year in Yorkshire conditions before it started sounding rough. I opened it up carefully to see if I could give it a refurb and some fresh grease, and it was very sludgey inside, so I’m not expecting much more out of it.
At £12 a pop, I’m not going to get too upset about it.Posted 5 years agoweeksySubscriber
I was going through HT2’s at a fair old rate, then i found out it was partly incometence….
Then i found it it was partly buyinf the cheapo Shimano ones..
I bought the XTR’s from Rose, that one is lasting MUCH better…. i’m actually not waiting for it to explode every ride.Posted 5 years agojamesoSubscriber
I’d be so happy to get a year out of XT/XTR BBs. At 10-20hrs use a week in mixed conditions, cranks lightly preloaded, 4 months on average / 3 replaced in just over a year. The sealing isn’t good and the XTR are no better, from what I can see they are exactly the same inside as XT? Decent seals would help I think – they may be cheap but there’s either a good reason for an open bearing or they’re a poor design imo.Posted 5 years ago
I think there’s a reason for the design that I’m missing since shimano’s stuff is otherwise excellent. But either way, when my stock of Shimano’s run out I’m fitting a Hope or similar.
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