#1
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Bottom brackets
Hello,
My bottom bracket has been making creaky and clicky noises; as this is my first cartridge BB I wasn't entirely sure what this signified, but my LBS say the bearings are knackered and replacement is called for. Fair enough, I wasn't expecting it to last forever - but it's only done about 1500 miles. Bloke in LBS suggested this was pretty good going and they normally expect about an 8 month lifespan with daily use - surely this can't be right? I don't want to be shelling out for a new BB every year, so my options would seem to be getting a decent quality cartridge BB or getting a cup and cone one, so.. Any recommendations for cartridge BBs with a decent lifespan? Can I still get a cup-and-cone BB anywhere? I've had a poke about the usual web suspects but even the BoB don't seem to have any. It's a Shimano-type square-taper BB btw, from a fitting-my-cranks point of view. cheers, Finlay |
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#2
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Bottom brackets
Finlay Mackay wrote:
Hello, My bottom bracket has been making creaky and clicky noises; as this is my first cartridge BB I wasn't entirely sure what this signified, but my LBS say the bearings are knackered and replacement is called for. Fair enough, I wasn't expecting it to last forever - but it's only done about 1500 miles. Bloke in LBS suggested this was pretty good going and they normally expect about an 8 month lifespan with daily use - surely this can't be right? Hello [back from hols!] You should normally expect more miles than that. Over-tightening the cups causes premature wear sometimes as the cartridge bearings inside get squashed. I don't want to be shelling out for a new BB every year, so my options would seem to be getting a decent quality cartridge BB or getting a cup and cone one, so.. Any recommendations for cartridge BBs with a decent lifespan? I would just get another fairly basic one, eg. Shimano UN73. May not last very very long, but only costs a few pounds and doesn't require any maintenance while it does last. I'm not convinced that expensive cartridge BBs last any longer. Can I still get a cup-and-cone BB anywhere? I've had a poke about the usual web suspects but even the BoB don't seem to have any. I haven't specifically poked around for one for ages, but haven't accidentally come accross one for ages either. If there was one, I think it would either be a cheap nasty heavy thing or an expensive speciality. ~PB |
#3
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Bottom brackets
On Thu, 09 Aug 2007, Finlay Mackay fmackayatclaradotcodotyookay wrote:
LBS say the bearings are knackered and replacement is called for. Fair enough, I wasn't expecting it to last forever - but it's only done about 1500 miles. Bloke in LBS suggested this was pretty good going and they normally expect about an 8 month lifespan with daily use - surely this can't be right? No, not right. My 1992 Dawes Galaxy is still on its original, despite daily commuting for ten years, occasional use for five, and occasional abuse of the complete-submersion type. That has a Shimano Deore LX (I think - most of it was Deore LX) - but I don't know what that is now - about 75% from cheapest to most expensive Shimano. regards, Ian SMith -- |\ /| no .sig |o o| |/ \| |
#4
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Bottom brackets
On 09/08/2007 20:42, Finlay Mackay said,
Hello, My bottom bracket has been making creaky and clicky noises; as this is my first cartridge BB I wasn't entirely sure what this signified, but my LBS say the bearings are knackered and replacement is called for. Fair enough, I wasn't expecting it to last forever - but it's only done about 1500 miles. Bloke in LBS suggested this was pretty good going and they normally expect about an 8 month lifespan with daily use - surely this can't be right? No, it isn't right. My commuter had a Shimano square-tapered cartridge bottom bracket for 9 years. It was only changed about a year ago because of a new crankset, and still ran smoothly and quietly - in fact it was donated to another bike to replace the cup-and-cone BB that had which was running rough, and presumably is still going strong. Your LBS is trying it on. Creaky and clicky noises can be anything. Presumably as you've taken it into your LBS for investigation you aren't happy poking about yourself, but if you could take the cranks off and turn the axle I would hazard a guess that it would be smooth. Creaks and clicks in that area are usually pedal threads in cranks or cranks against axles. The first is easy - remove the pedal, clean the threads in the crank and the pedal, re-grease and replace tightly. The second means taking the crank arms off, cleaning everything up and re-assembling. Opinions vary as to whether you should use grease or not. I did, but some people say you can crack the crank doing that. I've had a cracked crank - draw your own conclusions :-) -- Paul Boyd http://www.paul-boyd.co.uk/ |
#5
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Bottom brackets
On Thu, 09 Aug 2007 20:42:22 +0100, Finlay Mackay
fmackayatclaradotcodotyookay wrote: Any recommendations for cartridge BBs with a decent lifespan? I can only comment on what I use My audax bike has done 21500 miles on a Royce Titanium Axle bottom bracket. No signs of any problems yet. My commuting bike recently needed its Shimano bottom bracket (UN71 ??) after quite a few miles. I replaced it with TA Axix Light. It is too early to say how long this will last but it uses standard cartridge bearings. When this BB plays up I will just need to exchange them. Provided I have not damaged the axle it will cost £10 to make it like new. |
#6
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Bottom brackets
On 2007-08-09, Paul Boyd wrote:
On 09/08/2007 20:42, Finlay Mackay said, Hello, My bottom bracket has been making creaky and clicky noises; as this is my first cartridge BB I wasn't entirely sure what this signified, but my LBS say the bearings are knackered and replacement is called for. Fair enough, I wasn't expecting it to last forever - but it's only done about 1500 miles. Bloke in LBS suggested this was pretty good going and they normally expect about an 8 month lifespan with daily use - surely this can't be right? No, it isn't right. My commuter had a Shimano square-tapered cartridge bottom bracket for 9 years. It was only changed about a year ago because of a new crankset, and still ran smoothly and quietly - in fact it was donated to another bike to replace the cup-and-cone BB that had which was running rough, and presumably is still going strong. Your LBS is trying it on. Creaky and clicky noises can be anything. Presumably as you've taken it into your LBS for investigation you aren't happy poking about yourself, but if you could take the cranks off and turn the axle I would hazard a guess that it would be smooth. I suspect it would - the symptoms are unlike those with worn bearings in a cup-and-cone BB, where you can rattle the crank from side to side easily. It takes a fair bit of force (say, pushing down on the pedals when setting off in an inappropriately high gear level of force) to elicit a click, then pushing in the other direction will make it click back. The effect is more pronounced when the cranks are close to vertical. I've just had a go at measuring whether the cranks actually move (ie wrt the plane of the main tubes) - not more than 0.2mm if at all. Creaks and clicks in that area are usually pedal threads in cranks or cranks against axles. The first is easy - remove the pedal, clean the threads in the crank and the pedal, re-grease and replace tightly. The second means taking the crank arms off, cleaning everything up and re-assembling. Opinions vary as to whether you should use grease or not. I did, but some people say you can crack the crank doing that. I've had a cracked crank - draw your own conclusions :-) It's definitely not the pedals; I'll try refitting the cranks. thanks, Finlay |
#7
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Bottom brackets
Finlay Mackay wrote:
On 2007-08-09, Paul Boyd wrote: On 09/08/2007 20:42, Finlay Mackay said, Hello, My bottom bracket has been making creaky and clicky noises; as this is my first cartridge BB I wasn't entirely sure what this signified, but my LBS say the bearings are knackered and replacement is called for. Fair enough, I wasn't expecting it to last forever - but it's only done about 1500 miles. Bloke in LBS suggested this was pretty good going and they normally expect about an 8 month lifespan with daily use - surely this can't be right? No, it isn't right. My commuter had a Shimano square-tapered cartridge bottom bracket for 9 years. It was only changed about a year ago because of a new crankset, and still ran smoothly and quietly - in fact it was donated to another bike to replace the cup-and-cone BB that had which was running rough, and presumably is still going strong. Your LBS is trying it on. Creaky and clicky noises can be anything. Presumably as you've taken it into your LBS for investigation you aren't happy poking about yourself, but if you could take the cranks off and turn the axle I would hazard a guess that it would be smooth. I suspect it would - the symptoms are unlike those with worn bearings in a cup-and-cone BB, where you can rattle the crank from side to side easily. You also get those symptoms with a cartidge BB when the bearings are worn. The BB doesn't need replacing if there is no play like that and no bad roughness. ~PB |
#8
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Bottom brackets
in message , Finlay Mackay
fmackayatclaradotcodotyookay ('') wrote: Hello, My bottom bracket has been making creaky and clicky noises; as this is my first cartridge BB I wasn't entirely sure what this signified, but my LBS say the bearings are knackered and replacement is called for. Fair enough, I wasn't expecting it to last forever - but it's only done about 1500 miles. Bloke in LBS suggested this was pretty good going and they normally expect about an 8 month lifespan with daily use - surely this can't be right? Depends what sort of life. Bottom bearings on jump bikes and hardtail mountain bikes don't tend to last long, since every time you go over a serious bump or land a reasonable jump they take a lot of impact. But I'd expect a quality bottom bracket on a road bike to last of the order of 12,000-20,000 miles. It's a Shimano-type square-taper BB btw, from a fitting-my-cranks point of view. Ah, Shimano. No, replace it every year :-) Seriously, I don't think Shimano make good quality square taper BBs any more (and I should probably stock up on a couple of Campag ones, since they're phasing out square taper too). All the high quality Shimano groups have gone onto Octalink or Hollowtech II. -- (Simon Brooke) http://www.jasmine.org.uk/~simon/ ;; All in all you're just another hick in the mall -- Drink C'lloid |
#9
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Bottom brackets
On 2007-08-09, Pete Biggs wrote:
Finlay Mackay wrote: On 2007-08-09, Paul Boyd wrote: On 09/08/2007 20:42, Finlay Mackay said, Hello, My bottom bracket has been making creaky and clicky noises; as this is my first cartridge BB I wasn't entirely sure what this signified, but my LBS say the bearings are knackered and replacement is called for. Fair enough, I wasn't expecting it to last forever - but it's only done about 1500 miles. Bloke in LBS suggested this was pretty good going and they normally expect about an 8 month lifespan with daily use - surely this can't be right? No, it isn't right. My commuter had a Shimano square-tapered cartridge bottom bracket for 9 years. It was only changed about a year ago because of a new crankset, and still ran smoothly and quietly - in fact it was donated to another bike to replace the cup-and-cone BB that had which was running rough, and presumably is still going strong. Your LBS is trying it on. Creaky and clicky noises can be anything. Presumably as you've taken it into your LBS for investigation you aren't happy poking about yourself, but if you could take the cranks off and turn the axle I would hazard a guess that it would be smooth. I suspect it would - the symptoms are unlike those with worn bearings in a cup-and-cone BB, where you can rattle the crank from side to side easily. You also get those symptoms with a cartidge BB when the bearings are worn. The BB doesn't need replacing if there is no play like that and no bad roughness. There was no play in the spindle, but the BB had the outside of the left-hand bearing flush with the shell, so it was free to rotate - this exhibited a bit of play and I suspect this was the source of the problem. I've now replaced it with a Shimano one which seems fine, at least as far as I can tell without leaving the house, been raining all day here. Thanks to all who replied, Finlay |
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