I was out yesterday and noticed a slight loose movement in the cranks. When I got home I examined the bike and there is some distinct movement when I push/pull the cranks sideways.
Would I be right in thinking this is the bottom bracket that needs fixing?
I am a little reticent about taking it to the LBS immediately as I ended up having a new bottom bracket fitted to my old bike when it later transpired the clicking noise during rotation was nothing more than some grit in the pedals. Definitely not grit this time but it would be nice to go armed with some probable causes.
I was out yesterday and noticed a slight loose movement in the cranks. When I got home I examined the bike and there is some distinct movement when I push/pull the cranks sideways.
Would I be right in thinking this is the bottom bracket that needs fixing?
I am a little reticent about taking it to the LBS immediately as I ended up having a new bottom bracket fitted to my old bike when it later transpired the clicking noise during rotation was nothing more than some grit in the pedals. Definitely not grit this time but it would be nice to go armed with some probable causes.
If you have the tools, it might be worth seeing if it has worked loose and just needs to be tightened up.
-- Don Whybrow
Sequi Bonum Non Time
People must not do things for fun. We are not here for fun. There is no reference to fun in any Act of Parliament.
Would I be right in thinking this is the bottom bracket that needs fixing?
What is it with bottom brackets at the moment? Have they come into season???
Is it the whole crankset moving sideways, or just one arm? If the former, then it sounds like the bottom bracket at the very least needs adjusting. Make sure the right hand cup is tight (tightens anti-clockwise), then adjust the left hand cup (tightens clockwise) until the play has gone. If the play disappears but you end up with a stiff or graunchy bottom bracket, the technical term for this condition is "knackered".
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I am a little reticent about taking it to the LBS immediately as I ended up having a new bottom bracket fitted to my old bike when it later transpired the clicking noise during rotation was nothing more than some grit in the pedals.
I was out yesterday and noticed a slight loose movement in the cranks. When I got home I examined the bike and there is some distinct movement when I push/pull the cranks sideways.
Would I be right in thinking this is the bottom bracket that needs fixing?
Most likely the bottom bracket's bearings are knackered if it's the same with both cranks. A modern BB can't be fixed; the whole thing has to be replaced.
Most likely the bottom bracket's bearings are knackered if it's the same with both cranks. A modern BB can't be fixed; the whole thing has to be replaced.
Just replaced the outboard bearings on an Ultegra. Ofcourse their was already a nasty groove worn in the non-replacable axle. Silly design
Most likely the bottom bracket's bearings are knackered if it's the same with both cranks. A modern BB can't be fixed; the whole thing has to be replaced.
Just replaced the outboard bearings on an Ultegra. Ofcourse their was already a nasty groove worn in the non-replacable axle. Silly design
I don't call these outboard things "bottom brackets" ;-)
Most likely the bottom bracket's bearings are knackered if it's the same with both cranks. A modern BB can't be fixed; the whole thing has to be replaced.
Just replaced the outboard bearings on an Ultegra. Ofcourse their was already a nasty groove worn in the non-replacable axle. Silly design
I don't call these outboard things "bottom brackets" ;-)
~PB
Agreed, Shimano should give them a BR part number 😉
Is it the whole crankset moving sideways, or just one arm? If the
Yes both.
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Sounds like you might need to change your LBS :-)
Yes done that too! Took to LBS2 today and sure enough the BB is knackered. LBS2 then called up later to say it was also seized into the frame as well which is a little worrying as this Claude Butler is only a year old.
Is it the whole crankset moving sideways, or just one arm? If the
Quoted message said:
Yes both.
Quoted message said:
Sounds like you might need to change your LBS :-)
Quoted message said:
Yes done that too! Took to LBS2 today and sure enough the BB is knackered. LBS2 then called up later to say it was also seized into the frame as well which is a little worrying as this Claude Butler is only a year old.
Most likely the bottom bracket's bearings are knackered if it's the same with both cranks. A modern BB can't be fixed; the whole thing has to be replaced.
Just replaced the outboard bearings on an Ultegra. Ofcourse their was already a nasty groove worn in the non-replacable axle. Silly design
OK, that sounds a bit worrying. What caused that? Seized bearing?
-- Mike Van Tuyl titanium Dura Ace 10 Fausto Coppi aluminium Ultegra 10 Raleigh Record Sprint mongrel
Most likely the bottom bracket's bearings are knackered if it's the same with both cranks. A modern BB can't be fixed; the whole thing has to be replaced.
Just replaced the outboard bearings on an Ultegra. Ofcourse their was already a nasty groove worn in the non-replacable axle. Silly design
OK, that sounds a bit worrying. What caused that? Seized bearing?
It starts with ignoring everything taught about bearing design. With a rotating load as in a crankset you want a pressfit on the axle (to prevent the axle from wandering in the bearing ring) and a loose fit (to prevent the bearings seizing) on the outer ring of the bearing. A this is a bicycle *) it is built the other way round. Which means that there will be a lot of movement on the axle-bearing interface, even with the bearing in good nick. It probably doesn't need much rust in the bearing for the movement to increase appreciably. <shudder>And this was an Ultegra, 105 has an aluminium axle! </shudder>
*) as per another chapter of the universal bicycle design guide -- --- Marten Gerritsen
Just replaced the outboard bearings on an Ultegra. Ofcourse their was already a nasty groove worn in the non-replacable axle. Silly design
OK, that sounds a bit worrying. What caused that? Seized bearing?
It starts with ignoring everything taught about bearing design. With a rotating load as in a crankset you want a pressfit on the axle (to prevent the axle from wandering in the bearing ring) and a loose fit (to prevent the bearings seizing) on the outer ring of the bearing. A this is a bicycle *) it is built the other way round. Which means that there will be a lot of movement on the axle-bearing interface, even with the bearing in good nick. It probably doesn't need much rust in the bearing for the movement to increase appreciably. <shudder>And this was an Ultegra, 105 has an aluminium axle! </shudder>
*) as per another chapter of the universal bicycle design guide
Thanks, I'll have to keep an eye on mine. Nothing like that happening yet.
-- Mike Van Tuyl titanium Dura Ace 10 Fausto Coppi aluminium Ultegra 10 Raleigh Record Sprint mongrel
