External Bottom Bracket Lifespans

For discussions about bikes and equipment.

How long did yours last. (miles)

Less than 1000
6
9%
1000-2000
10
15%
2000-3000
15
22%
3000-4000
7
10%
4000-5000
4
6%
5000-6000
4
6%
6000-8000
7
10%
8000-10000
3
4%
10000-15000
6
9%
over 15000
6
9%
 
Total votes: 68

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[XAP]Bob
Posts: 19801
Joined: 26 Sep 2008, 4:12pm

Re: External Bottom Bracket Lifespans

Post by [XAP]Bob »

tim-b wrote:I've not voted because (whisper) they're all still going (oh dear)


Same reason for lack of vote - now 3 1/2 years, so that;s about 9k miles without maintenance of any sort - I've taken out the "axle" to replace the granny ring, but didn't do anything to the BB
A shortcut has to be a challenge, otherwise it would just be the way. No situation is so dire that panic cannot make it worse.
There are two kinds of people in this world: those can extrapolate from incomplete data.
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[XAP]Bob
Posts: 19801
Joined: 26 Sep 2008, 4:12pm

Re: External Bottom Bracket Lifespans

Post by [XAP]Bob »

Malaconotus wrote:60% failure rate within 3000 miles? OK it's not a scientific poll, but that's absolutely shocking.

Most specifically no "not worn" option...

So no vote from me yet...Give it a while and I'll be able to say >15k, but I can't say that until 15k is completed.

The same vote for square tapers could suffer from the same, early failures are those which can vote. If they fail due to poor installation then they'll probably fail again when bought from the same source, giving a cluster of failures which reveal nothing about the product.

I'll happily concede that they may be more vulnerable to weather (which isn't an advantage) but they do make changing rings easier. Mine not being juat behind a front wheel is also going to be advantageous
Last edited by [XAP]Bob on 27 Jul 2014, 4:59pm, edited 1 time in total.
A shortcut has to be a challenge, otherwise it would just be the way. No situation is so dire that panic cannot make it worse.
There are two kinds of people in this world: those can extrapolate from incomplete data.
iandriver
Posts: 2521
Joined: 10 Jun 2009, 2:09pm
Location: Cambridge.

Re: External Bottom Bracket Lifespans

Post by iandriver »

Might as well post the link here that I've put in another thread. Tiagra replaced this morning. On popping apart, water flooding out and full of brown sludge where grease should be. 3 to 4 thousand miles estimate. Gave no real warning of failure. Just started clunking on the way to work. As wiggle are flogging them for £7.50 at the moment, got a couple.
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Supporter of the A10 corridor cycling campaign serving Royston to Cambridge http://a10corridorcycle.com. Never knew gardening secateurs were an essential part of the on bike tool kit until I took up campaigning.....
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Redvee
Posts: 2469
Joined: 8 Mar 2010, 8:58pm

Re: External Bottom Bracket Lifespans

Post by Redvee »

My Specialised Allez had a Tiagra level external BB and I bought it pre-owned when it was 2 years old. I then had 3 years out of the BB and a further year when I swapped the bits to my PX frame. When I recently change the PX to SS I bought a new 105 BB off CRC for £10.
reohn2
Posts: 45181
Joined: 26 Jun 2009, 8:21pm

Re: External Bottom Bracket Lifespans

Post by reohn2 »

Redvee wrote:My Specialised Allez had a Tiagra level external BB and I bought it pre-owned when it was 2 years old. I then had 3 years out of the BB and a further year when I swapped the bits to my PX frame. When I recently change the PX to SS I bought a new 105 BB off CRC for £10.

How much bad weather did the BB see?
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Redvee
Posts: 2469
Joined: 8 Mar 2010, 8:58pm

Re: External Bottom Bracket Lifespans

Post by Redvee »

reohn2 wrote:How much bad weather did the BB see?


Not much TBH though I did ride 40 miles in the rain with mudguards that left the headset in a very sad state when I moved the bike 2 weeks later.
iandriver
Posts: 2521
Joined: 10 Jun 2009, 2:09pm
Location: Cambridge.

Re: External Bottom Bracket Lifespans

Post by iandriver »

With this level of water ingress, I believe the lifespan becomes a lottery. Might get more, might get less. Luck's not a factor I look for in reliability :(
A couple of weeks ago, I'd have said no problems with mine. Without taking it apart, which you're advised not to do, you have no idea what's really going on in there.
Supporter of the A10 corridor cycling campaign serving Royston to Cambridge http://a10corridorcycle.com. Never knew gardening secateurs were an essential part of the on bike tool kit until I took up campaigning.....
bikerwaser
Posts: 359
Joined: 26 Aug 2012, 9:50am

Re: External Bottom Bracket Lifespans

Post by bikerwaser »

Just had another BB51 go after 1549 miles. This one was on my Genesis Longitude.

As i mentioned on a previous post, since I changed my BB51 (non stainless bearings)to a Hope BB(Stainless Bearings) I haven't had any problems and done about 7 times the mileage so far on the Hope.
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Mick F
Spambuster
Posts: 56367
Joined: 7 Jan 2007, 11:24am
Location: Tamar Valley, Cornwall

Re: External Bottom Bracket Lifespans

Post by Mick F »

4000+ miles on mine so far.
All going well with no play.
Mick F. Cornwall
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SimonCelsa
Posts: 1234
Joined: 6 Apr 2011, 10:19pm

Re: External Bottom Bracket Lifespans

Post by SimonCelsa »

Decided to relubricate mine the other day after detecting a slight clicking. Too late, non drive side badly corroded, drive side OK. About 3500 miles but I did submerge it in seawater back in October 2017 somewhere just South of Lancaster....I thought the water across the road was only a couple of inches deep, but as I progressed further and my feet started getting wet, keeping the hub dynamo dry was my main concern. I did regrease the bearings shortly after they had been submerged but probably should have fresh water flushed them first.

SJS are flogging off some basic EBBs pretty cheap https://www.sjscycles.co.uk/bottom-brac ... ead-bb52b/. Pity the postage to a Highland address is so extortionate,

all the best, Simon
Keezx
Posts: 490
Joined: 20 Dec 2014, 10:44am
Location: The Netherlands

Re: External Bottom Bracket Lifespans

Post by Keezx »

3 Years ago I bought a used SRAM GXP crankset with an also used GXP BB.
After 3 seasons (> 15000 km) mostly ridden in dry circumstances it's still running fine.
Marcus Aurelius
Posts: 1903
Joined: 1 Feb 2018, 10:20am

Re: External Bottom Bracket Lifespans

Post by Marcus Aurelius »

I prefer a threaded B.B. They are physically larger, they are fixed more securely than press fit numbers due to the threads and as long as you look after the cups properly ( check that the grease hasn’t been washed out over winter) and regrease them if you need to, they shouldn’t cause too many issues. I’ve got a 50:50 mix of bikes with press fit : threaded B.B. I prefer the threaded ones.
hemo
Posts: 1438
Joined: 16 Nov 2017, 5:40pm
Location: West Sussex

Re: External Bottom Bracket Lifespans

Post by hemo »

No issue with Hollow tech one is now 5 years old and used 3 to 4 times a week another on abused mtb no issue.
GXP on my 700c replace at about 3k of use, play/worn ball bearings on the drive side.
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The utility cyclist
Posts: 3607
Joined: 22 Aug 2016, 12:28pm
Location: The first garden city

Re: External Bottom Bracket Lifespans

Post by The utility cyclist »

I don't bother counting, it's not a major cost nor hassle to remove, in fact it's a lot less hassle to fit/remove than ST, Octalink still going fine after 8.5 years on the commuter/utility/do it all bike. :lol:
People going through deep water/atrocious conditions and not taking remedial action then finding that this has had a detrimental effect shocker :roll:
The external BB design is clearly not as weatherproof as some of the older designs, if it bothers people that much just strip out the chainset/BB straight away or at next time of service and replace with what you know is tried and tested for you.

I run 4 different BB types, well actually 5 if you count the threadless Mavic BB on my Gitane team replica (though it is ST still) they all offer something different, they will all last differing periods of time and they will all require more or less maintenance/replacement. I don't get stressed, or I won't if one packs up sooner than I thought, there are bigger issues to worry about.

So far for me in the last 17 years Octalink has proven to be the best in terms of miles in most foul weather but then that's because that's my main bike, before that I ran the old cup and cone on my Raleigh Record sprint for about 10 years doing an absolute shed load of miles (a lot more than I do now) as it was my only bike then. The octalink is showing no signs of being worn, I think they are about £12 to replace for the one I use. Hardly breaking the bank.

My point is I don't really see the point of the thread, what does it ultimately achieve, what does it tell the vast majority that we didn't already know? And even if it tells you something new does it really matter that much if at all?
freeflow
Posts: 1645
Joined: 29 Aug 2011, 1:54pm

Re: External Bottom Bracket Lifespans

Post by freeflow »

Hope ceramic BB for the past 4 years with no problems. Probably about 10km+ miles in that timeframe. I have checked and put in some new lube about twice in that time. Usually after the bike has had a very wet/submersive experience.
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