"Hammer-like" noises while sprinting
#1
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"Hammer-like" noises while sprinting
After a deep overhaul of headset and fork (carbon), the bike feels more rigid and the headset keeps tight, even at 4Nm stem torque. Bearings were changed (although not sure the old ones were worn out), bearing tapered seats (integrated, carbon) were reconstructed, stem was changed, shapes carved by the stem and compression ring in the carbon steerer were also reconstructed.
However, an old issue (2-3 years) remains: intermittent noises appear while standing up and sprinting, something like hits between some parts under tension. The noise sounds almost metallic sometimes, a little like a hammer hit.
Is it possible to come from the front wheel? It is a DT Swiss with 16 spokes, not crossed, probably highly tensioned. 38000 km and no hub maintenance to date, but rotation still feels smooth and “buttery” in hand, as it felt when it was new.
Thanks
However, an old issue (2-3 years) remains: intermittent noises appear while standing up and sprinting, something like hits between some parts under tension. The noise sounds almost metallic sometimes, a little like a hammer hit.
Is it possible to come from the front wheel? It is a DT Swiss with 16 spokes, not crossed, probably highly tensioned. 38000 km and no hub maintenance to date, but rotation still feels smooth and “buttery” in hand, as it felt when it was new.
Thanks
#2
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Are you certain it's not just something on the road?
This time of year where I'm at there is a lot of stuff from trees and bushes falling. I was quite surprised just a couple hours ago when I ran through a bunch of something that sounded like fire crackers going off.
This time of year where I'm at there is a lot of stuff from trees and bushes falling. I was quite surprised just a couple hours ago when I ran through a bunch of something that sounded like fire crackers going off.
#3
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Definitely not. It appears only (and always) while standing up and sprinting. For the wheels it means higher load on front plus lateral load, due to leaning left-right.
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Loose wheel bearing?
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Throw a different front wheel on it and see if it stops.
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Is the crankset installed correctly and properly torqued to spec?
#7
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I have no tools and no experience to check the crankset. I thought it lasts for lifetime... The bike was bought as new years ago.
Testing another wheel is an alternative, I'll try to find one.
Testing another wheel is an alternative, I'll try to find one.
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Sounds like you really drop the hammer while sprinting! 😆
Seriously though, rim or disc brakes on this bike?
Seriously though, rim or disc brakes on this bike?
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Loud clunking/hammering sounds can often be BB or rear axle bearings, surfaces badly pitted and likely lube long gone. Andy
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#12
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Bearings were changed (although not sure the old ones were worn out), bearing tapered seats (integrated, carbon) were reconstructed, stem was changed, shapes carved by the stem and compression ring in the carbon steerer were also reconstructed.
If the headset isn't properly fitting in the head tube then you might be hearing or feeling it hammer on the head tube while you are putting out power.
Maybe some more past history explaining why the stuff you say had to be done to your headset and head tube might help or at least satisfy curiosity that things were done with good reason. I've never understood how people have headsets that get messed up that don't ride like they were in a BMX race.
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Redbullet has at least two prior threads along this general topic. With no OP reference to these previous threads I can see why Iride01 might not fully understand the OP's current comments here. Not at all surprising. Andy
Headset questions – road bike, carbon - Bike Forums
Light carbon fork replacement (Road) - Bike Forums
Headset questions – road bike, carbon - Bike Forums
Light carbon fork replacement (Road) - Bike Forums
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#15
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Not to be condescending or anything, but your description here sort of sounds bizarre. Are you the person that did this or are you relating 2nd or 3rd hand what someone told you was done to the bike?
If the headset isn't properly fitting in the head tube then you might be hearing or feeling it hammer on the head tube while you are putting out power.
If the headset isn't properly fitting in the head tube then you might be hearing or feeling it hammer on the head tube while you are putting out power.
The noise appeared 1-2 years ago and it is the same now, so I guess it is not related to the headset and steerer, which were deeply overhauled / reshaped during the last weeks (with good results so far).
Last edited by Redbullet; 05-28-22 at 01:12 PM.
#16
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The BB is SRAM GXP press fit, for road bike. I have just learned that I don't need special tools to remove the crank set on this, so I did it and I took a look inside. It looks like the bearings still hold some grease (I removed dust protections to look inside). But the right bearing feels a little "grinding" while rotating by hand, even after forced filling with new grease, as opposite to the left bearing which rotates very smooth.
It looks that from this point it is about experimenting... first, with another front wheel.
Then, with BB will be more difficult. I don't know whether the bearings inside press fit BB can be securely extracted with a special tool, not to mention that SRAM does not sell bearings for their BB. I only hope I'll not be forced to mess around with changing of the whole press fit BB on a carbon frame...
#17
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#18
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check your chain wear, but more importantly check the wear on your front chainring. The noise is likely your chain briefly coming off the chainring because it's worn out.
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