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#1
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creaking noise when right crank is pushed hard
Hi - i recently got a Trek 7.1 hybrid from a friend. it is second hand
and has had a fair life. When i peddle hard, i get a creaking sort of noise just on the right crank. It is most apparent on the highest (i mean largest) front cog and smallest rear cog. It occurs in the pushing phase of peddling, not as the right crank comes back around as i push on the left crank. I can also hear/feel it when i am on the largest front cog but smallest but-one rear cog. But much less so. Speed of crank rotation does not seem to affect it. It does not sound or feel like the peddle or crank are knocking against anything. I'm not sure if this has anything to do with it but, i had the bike upturned the other day to check the gear cabling adjustments. When i rotated (by hand) the cranks and the rear wheel got some real speed up, it did not rotate 'true'. I mean, the rear of the bike vibrated quite a bit (maybe just the energy in the rotation) but also it looked like the rear gear cassette was rotating around a v slightly different axis to the wheel itself). Not sure how worried i should be about this! Apologies if this is hard to decipher as i am not bike expert. I'm just trying to work out if this is something i can fix myself, requires a professional, and how much it might cost to rectify. thanks. |
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#2
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creaking noise when right crank is pushed hard
On Jan 29, 1:44 pm, wrote:
Hi - i recently got a Trek 7.1 hybrid from a friend. it is second hand and has had a fair life. When i peddle hard, i get a creaking sort of noise just on the right crank. It is most apparent on the highest (i mean largest) front cog and smallest rear cog. http://sheldonbrown.com/creaks.html My guess: saddle or seat clamp needs grease and tightening, could be a dozen other things. |
#3
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creaking noise when right crank is pushed hard
On Jan 29, 2:44 pm, wrote:
Hi - i recently got a Trek 7.1 hybrid from a friend. it is second hand and has had a fair life. When i peddle hard, i get a creaking sort of noise just on the right crank. It is most apparent on the highest (i mean largest) front cog and smallest rear cog. It occurs in the pushing phase of peddling, not as the right crank comes back around as i push on the left crank. I can also hear/feel it when i am on the largest front cog but smallest but-one rear cog. But much less so. Speed of crank rotation does not seem to affect it. It does not sound or feel like the peddle or crank are knocking against anything. I'm not sure if this has anything to do with it but, i had the bike upturned the other day to check the gear cabling adjustments. When i rotated (by hand) the cranks and the rear wheel got some real speed up, it did not rotate 'true'. I mean, the rear of the bike vibrated quite a bit (maybe just the energy in the rotation) but also it looked like the rear gear cassette was rotating around a v slightly different axis to the wheel itself). Not sure how worried i should be about this! Apologies if this is hard to decipher as i am not bike expert. I'm just trying to work out if this is something i can fix myself, requires a professional, and how much it might cost to rectify. thanks. I hope landotter is right and I'm wrong, for your sake, but I'm thinking bottom bracket. Sheldons site is still a very useful tool for dealing with that, but if you strike out with landotters suggestions you may check the bottom bracket. It's my understanding that the wheel being out of true would refer to the rim wobbling in relation to the hub, not the cassette wobbling on the hub. The hub and cassette being very slightly off could just be the loose tolerances of inexpensive equipment. I wouldn't stress over it. If the rim itself is out of true enough that it bothers you, becomes noticeable or rubs the brake pads I'd true the wheel up, but otherwise you're probably good. Sounds like you're going to be able to do it yourself if you want to take the time and learn a little as you go. I treat Sheldons site as my cycle repair bible, and have learned to overtake MANY projects that way. Good luck to you, and come back when you're done and let us know what you did and how it works out. Dan Dan |
#5
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creaking noise when right crank is pushed hard
When i peddle hard, i get a creaking sort of noise just on the right
crank. It is most apparent on the highest (i mean largest) front cog and smallest rear cog. It occurs in the pushing phase of peddling, not as the right crank comes back around as i push on the left crank. I can also hear/feel it when i am on the largest front cog but smallest but-one rear cog. But much less so. Speed of crank rotation does not seem to affect it. I suspect it wouldn't take long for a shop to run down a few noises on your bike. Unfortunately, noises come in layers... you get rid of one noise, and find out it was masking another. If you want to try and run down things yourself, check out this page on our website- www.ChainReaction.com/noises.htm --Mike Jacoubowsky Chain Reaction Bicycles www.ChainReaction.com Redwood City & Los Altos, CA USA wrote in message ... Hi - i recently got a Trek 7.1 hybrid from a friend. it is second hand and has had a fair life. When i peddle hard, i get a creaking sort of noise just on the right crank. It is most apparent on the highest (i mean largest) front cog and smallest rear cog. It occurs in the pushing phase of peddling, not as the right crank comes back around as i push on the left crank. I can also hear/feel it when i am on the largest front cog but smallest but-one rear cog. But much less so. Speed of crank rotation does not seem to affect it. It does not sound or feel like the peddle or crank are knocking against anything. I'm not sure if this has anything to do with it but, i had the bike upturned the other day to check the gear cabling adjustments. When i rotated (by hand) the cranks and the rear wheel got some real speed up, it did not rotate 'true'. I mean, the rear of the bike vibrated quite a bit (maybe just the energy in the rotation) but also it looked like the rear gear cassette was rotating around a v slightly different axis to the wheel itself). Not sure how worried i should be about this! Apologies if this is hard to decipher as i am not bike expert. I'm just trying to work out if this is something i can fix myself, requires a professional, and how much it might cost to rectify. thanks. |
#6
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creaking noise when right crank is pushed hard
wrote:
Hi - i recently got a Trek 7.1 hybrid from a friend. it is second hand and has had a fair life. When i peddle hard, i get a creaking sort of noise just on the right crank. It is most apparent on the highest (i mean largest) front cog and smallest rear cog. It occurs in the pushing phase of peddling, not as the right crank comes back around as i push on the left crank. I can also hear/feel it when i am on the largest front cog but smallest but-one rear cog. But much less so. Speed of crank rotation does not seem to affect it. It does not sound or feel like the peddle or crank are knocking against anything. I'm not sure if this has anything to do with it but, i had the bike upturned the other day to check the gear cabling adjustments. When i rotated (by hand) the cranks and the rear wheel got some real speed up, it did not rotate 'true'. I mean, the rear of the bike vibrated quite a bit (maybe just the energy in the rotation) but also it looked like the rear gear cassette was rotating around a v slightly different axis to the wheel itself). Not sure how worried i should be about this! Apologies if this is hard to decipher as i am not bike expert. I'm just trying to work out if this is something i can fix myself, requires a professional, and how much it might cost to rectify. Noises can be hard to track down as they resonate but start by removing pedals, lube threads and torque properly (Campagnolo says 40nm. That or a bit higher). Then grab the right pedal in your hand and press/pull. Is the pedal cage loose on the body? Does any part of the pedal rock or move? Are there bolts holding the pedal cage to the body? Are they tight? Check left as well. Test ride for noise. Remove chainring bolts one at a time, oil or grease the male side and torque them. Test ride for noise. See if the crank is properly torqued to the spindle( there are various formats)Lubricate crank bolt threads. Test ride for noise. See if the crank assembly rocks in the bike (i.e., crank bearing problems). Look to see if a visible gap shows between right side cup flange and the frame. Crank bearing assemblies ('BB') require specialty tools. If you identify a problem there, you can decide whether to invest in tooling or to consult with your LBS. Is your chain lubricated? Dry chains can be loud. Oil then test ride for noise. A worn chain will exhibit symptoms in the most frequently used gear combination first, see 'chains' he http://draco.acs.uci.edu/rbfaq/FAQ/index.html but they usually are not noisy from wear. If you rear wheel has a reflector attached to a spoke, remove that and try spinning the wheel again. If it's still vibrating, see if the tire is evenly mounted by touching a finger lightly as it spins. If it's lumpy, look at the edge of the tire just above the braking surface. You'll see a molded raised line. That line should be even and visible all around. If not, remove tire and re-mount evenly before filling to pressure written on the tire sidewall. With the wheel secured in the bike, does the wheel rock from side to side in your hand? Bearing problems can be loud. (While we're there, thinking of that noise, lubricate the cam in your rear wheel quick release and lock it properly. The lever should leave a print on your palm for a few seconds. If it was not secured, the wheel can shift under pedal pressure and the noise will resonate through your frame.) If the reflector, tire or bearing are not the source of your vibration, observe the spinning rim. Is it round? Does it waver side to side? Are there dents? If any of those, is the spoke tension tight and even? Again, this is perfectly approachable by the practical man but a consultation with a competent mechanic may be of use as well. p.s. The link above has much more related and useful information. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
#7
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creaking noise when right crank is pushed hard
wrote:
Hi - i recently got a Trek 7.1 hybrid from a friend. it is second hand and has had a fair life. When i peddle hard, i get a creaking sort of noise just on the right crank. It is most apparent on the highest (i mean largest) front cog and smallest rear cog. It occurs in the pushing phase of peddling, not as the right crank comes back around as i push on the left crank. I can also hear/feel it when i am on the largest front cog but smallest but-one rear cog. But much less so. Speed of crank rotation does not seem to affect it. It does not sound or feel like the peddle or crank are knocking against anything. I'm not sure if this has anything to do with it but, i had the bike upturned the other day to check the gear cabling adjustments. When i rotated (by hand) the cranks and the rear wheel got some real speed up, it did not rotate 'true'. I mean, the rear of the bike vibrated quite a bit (maybe just the energy in the rotation) but also it looked like the rear gear cassette was rotating around a v slightly different axis to the wheel itself). Not sure how worried i should be about this! Apologies if this is hard to decipher as i am not bike expert. I'm just trying to work out if this is something i can fix myself, requires a professional, and how much it might cost to rectify. wrote: I hope landotter is right and I'm wrong, for your sake, but I'm thinking bottom bracket. Sheldons site is still a very useful tool for dealing with that, but if you strike out with landotters suggestions you may check the bottom bracket. It's my understanding that the wheel being out of true would refer to the rim wobbling in relation to the hub, not the cassette wobbling on the hub. The hub and cassette being very slightly off could just be the loose tolerances of inexpensive equipment. I wouldn't stress over it. If the rim itself is out of true enough that it bothers you, becomes noticeable or rubs the brake pads I'd true the wheel up, but otherwise you're probably good. Sounds like you're going to be able to do it yourself if you want to take the time and learn a little as you go. I treat Sheldons site as my cycle repair bible, and have learned to overtake MANY projects that way. Good luck to you, and come back when you're done and let us know what you did and how it works out. Thanks. Dan. You reminded me that a loose cassette lockring can also be noisy. The OP might see if the individual sprockets move on the cassette body. If so, lube and torque the lockring. -- Andrew Muzi www.yellowjersey.org Open every day since 1 April, 1971 |
#8
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creaking noise when right crank is pushed hard
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#9
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creaking noise when right crank is pushed hard
On Jan 29, 7:44 pm, wrote:
Hi - i recently got a Trek 7.1 hybrid from a friend. it is second hand and has had a fair life. When i peddle hard, i get a creaking sort of noise just on the right crank. It is most apparent on the highest (i mean largest) front cog and smallest rear cog. It occurs in the pushing phase of peddling, not as the right crank comes back around as i push on the left crank. I can also hear/feel it when i am on the largest front cog but smallest but-one rear cog. But much less so. Speed of crank rotation does not seem to affect it. It does not sound or feel like the peddle or crank are knocking against anything. I'm not sure if this has anything to do with it but, i had the bike upturned the other day to check the gear cabling adjustments. When i rotated (by hand) the cranks and the rear wheel got some real speed up, it did not rotate 'true'. I mean, the rear of the bike vibrated quite a bit (maybe just the energy in the rotation) but also it looked like the rear gear cassette was rotating around a v slightly different axis to the wheel itself). Not sure how worried i should be about this! Apologies if this is hard to decipher as i am not bike expert. I'm just trying to work out if this is something i can fix myself, requires a professional, and how much it might cost to rectify. thanks. A similarly annoying creak on my bike was eventually, after everything else had been torqued up correctly, traced to the crank, the arm which connects the pedal to the bottom bracket. The LBS twice tightened the crank bolts but the creaks returned the same say, so I lost patience and just did the job myself. I used a torque wrench and that did the job for good. It might be a good idea if you have the tools to take the bolt out and the arm off and just clean and grease everything so it fits together smoothly. If you know or can find the specific torque settings for your bike or component, use them. If not, here are some general guidelines: Cranks with square ends: - steel 30 - 40 Nm - aluminium 20 - 25 Nm - Shimano 35 - 45 Nm You can get crank bolts with Allen key heads or octagonal bolt heads. The latter are much more convenient in requiring standard sockets that fit the common kind of torque wrench. However, BBB sells a torgue wrench kit with Allen bits. Crank arm creak is pretty distinctive: it sounds like metal under stress and it there only when pedalling. Here's a zero-tool, zero-cost check: Stand the bike next to a pole in the ground, one pedal braced behind the pole so that the cranks are horizontal. Hold the handlebars and stand up with all your weight on the free pedal. If you hear nothing, turn the bike around and repeat for the other pedal. You'll hear the creak if it is the crank bolts that require tightening. HTH. Andre Jute Real men eat quiche with their fingers |
#10
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creaking noise when right crank is pushed hard
"Andre Jute" wrote in message
... You can get crank bolts with Allen key heads or octagonal bolt heads. The latter are much more convenient in requiring standard sockets that fit the common kind of torque wrench. However, BBB sells a torgue wrench kit with Allen bits. Hexagonal bolt heads, surely? Still tricky, since standard sockets have walls which are too thick to fit. I've actually got an 8mm allen 1/2" socket for my torque wrench/socket set. Don't tend to use it though. clive |
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