Maxx Posted October 28, 2012 Report Share Posted October 28, 2012 Hi, The other day I was wondering, what makes a hs33 or others rim brakes loud ? The sound make me to think it's a kind of vibration, but I don't know what parts of the bike ? Rim ? pads ? slave cylinder ? brake clamps ? bolts ? frame ? And I've heard that without booster we get more bite, why ? Shouldn't it be the contrary ? Quote Link to comment Share on other sites More sharing options...
Blake Posted October 28, 2012 Report Share Posted October 28, 2012 excess energy being turned into sound energy when the pads hit the rim Quote Link to comment Share on other sites More sharing options...
N.Wood Posted October 28, 2012 Report Share Posted October 28, 2012 Pad wobble causing vibration = noise. Generally you get less bite with a booster, more hold. Quote Link to comment Share on other sites More sharing options...
Jake. Posted October 28, 2012 Report Share Posted October 28, 2012 Without booster you get more bite cause it means the frame can push back into the pad more and it viberates more. Usually louder too. The sound comes from the pads when they make contact with the rim. Quote Link to comment Share on other sites More sharing options...
trialsiain Posted October 28, 2012 Report Share Posted October 28, 2012 harder pads make more noise i think as they vibrate more Quote Link to comment Share on other sites More sharing options...
onza pro series guy Posted October 28, 2012 Report Share Posted October 28, 2012 the actuall noise comes from pad wobble as mentioned before. A harder pad will wobble more, and therefore make more noise. A booster will give better hold but will have a negative effect on bite (if any), making less noise. Quote Link to comment Share on other sites More sharing options...
Nannerman Posted October 29, 2012 Report Share Posted October 29, 2012 (edited) I don't know for sure, but some frames seem to make more noise than others because (I think) the sound is amplified by the tubing thickness and shape. My dads kortz 2 made more noise than his Born, and the tubing on the kortz was larger and thinner. So like they said, the pad vibrates, and when that happens it works like the old phonographs in a way where it amplifies the sound. I don't think the brake pad on its own would be very loud rubbing on a rim if it was attached to something solid, not hollow. Just my thoughts. Edited October 29, 2012 by Nannerman Quote Link to comment Share on other sites More sharing options...
Maxx Posted October 29, 2012 Author Report Share Posted October 29, 2012 I don't know for sure, but some frames seem to make more noise than others because (I think) the sound is amplified by the tubing thickness and shape. My dads kortz 2 made more noise than his Born, and the tubing on the kortz was larger and thinner. So like they said, the pad vibrates, and when that happens it works like the old phonographs in a way where it amplifies the sound. I don't think the brake pad on its own would be very loud rubbing on a rim if it was attached to something solid, not hollow. Just my thoughts. It was my thought too : how a pad (considering it's just 'plastic') can produce a sound like this ? The sound is a 'metallic vibration', isn't it ? My theory was it's just the vibration of the pads which is repercuted on the clamps/cylinder/frame. This can explain why hard pads are louder (because they transfer better the vibration). Quote Link to comment Share on other sites More sharing options...
onza pro series guy Posted October 29, 2012 Report Share Posted October 29, 2012 It was my thought too : how a pad (considering it's just 'plastic') can produce a sound like this ? The sound is a 'metallic vibration', isn't it ? My theory was it's just the vibration of the pads which is repercuted on the clamps/cylinder/frame. This can explain why hard pads are louder (because they transfer better the vibration). The noise is wholely from the pad, there is so much force being transfered that as the pad grips, the wobble means that the pad is not touching the rim with 100% of its surface so the engery is also expelled as noise as the friction increases on the part of the pad that is still making contact with the rim. what does change the noise is different types of rims. Although the noise would and does reverb through the frame and slaves different types of frame would not make such an audible difference as the noise from the rim normally covers it up, basically. Quote Link to comment Share on other sites More sharing options...
Blake Posted October 29, 2012 Report Share Posted October 29, 2012 why do brakes make such little noise if there's no tyre on? Quote Link to comment Share on other sites More sharing options...
Canardweb Posted October 29, 2012 Report Share Posted October 29, 2012 The noise comes from the frame vibrating. Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted October 29, 2012 Report Share Posted October 29, 2012 (edited) why do brakes make such little noise if there's no tyre on? i´d guess that youre not standing on your bike without tyres on,so i´d say theres pretty much no force applied to the system rim-brake-frame... tyres are rotating mass,too,explaining why theres a diference. Edited October 29, 2012 by FamilyBiker Quote Link to comment Share on other sites More sharing options...
Carlperkins Posted October 29, 2012 Report Share Posted October 29, 2012 (edited) The sound comes from the pads when they make contact with the rim. captain obvious. i thought the noise came when your finger makes contact with the lever?? only kidding mate , but gave me a laugh Edited October 29, 2012 by Carlperkins 1 Quote Link to comment Share on other sites More sharing options...
Jake. Posted October 30, 2012 Report Share Posted October 30, 2012 captain obvious. i thought the noise came when your finger makes contact with the lever?? only kidding mate , but gave me a laugh Oh yeah! My levers always vibrate and make loads of noise when I touch them. Weird... Quote Link to comment Share on other sites More sharing options...
trialsEuan Posted November 1, 2012 Report Share Posted November 1, 2012 I found that when I ran the pads further away, the louder they were... I'm guessing because this allows the pads to vibrate more as was said above, as if they were ran further in, there would be less flex and be more rigid. Hence, less noise. Quote Link to comment Share on other sites More sharing options...
Maxx Posted November 3, 2012 Author Report Share Posted November 3, 2012 The noise is wholely from the pad, there is so much force being transfered that as the pad grips, the wobble means that the pad is not touching the rim with 100% of its surface so the engery is also expelled as noise as the friction increases on the part of the pad that is still making contact with the rim. what does change the noise is different types of rims. Although the noise would and does reverb through the frame and slaves different types of frame would not make such an audible difference as the noise from the rim normally covers it up, basically. If the sound comes only from pad wobble (or almost) why a booster reduce sound ? Booster doesn't reduce pad wobble so ... ? Sound also change with pads compounds. Despite your explication I can't still understand how plastic pads can produce any sounds on aluminium rims. Canardweb can you explain your point of view ? Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted November 3, 2012 Report Share Posted November 3, 2012 If the sound comes only from pad wobble (or almost) why a booster reduce sound ? Booster doesn't reduce pad wobble so ... ? Sound also change with pads compounds. Despite your explication I can't still understand how plastic pads can produce any sounds on aluminium rims. Canardweb can you explain your point of view ? Those vibrations are transfered into the frame, if you use booster, this transfer is limited, so noise is reduced. I guess lol. Quote Link to comment Share on other sites More sharing options...
Maxx Posted November 3, 2012 Author Report Share Posted November 3, 2012 In this case this is the frame which is responsable of the noise not the pads ? Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted November 3, 2012 Report Share Posted November 3, 2012 In this case this is the frame which is responsable of the noise not the pads ? I will put it like this, pad wobble is the cause of the noise, but frame is what amplifies it. That´s how I see it. Quote Link to comment Share on other sites More sharing options...
FamilyBiker Posted November 3, 2012 Report Share Posted November 3, 2012 we´re all riding weird gramophones!!! 1 Quote Link to comment Share on other sites More sharing options...
Ali C Posted November 3, 2012 Report Share Posted November 3, 2012 to give another side to this, you can just hold a pad and rub it against a wheel and have it make noise even if the wheel isn't in a frame. Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted November 3, 2012 Report Share Posted November 3, 2012 to give another side to this, you can just hold a pad and rub it against a wheel and have it make noise even if the wheel isn't in a frame. Hm, I tried and I couldn´t, you might be vibrating more Ali Quote Link to comment Share on other sites More sharing options...
Ali C Posted November 3, 2012 Report Share Posted November 3, 2012 you have to do quite fast movements like you're trying to wank off the rim or something, but it does make noise. Quote Link to comment Share on other sites More sharing options...
onza pro series guy Posted November 3, 2012 Report Share Posted November 3, 2012 we´re all riding weird gramophones!!! ahem brakeless cough cough dual disc Quote Link to comment Share on other sites More sharing options...
Martin Reynolds Posted November 3, 2012 Report Share Posted November 3, 2012 cough cough dual disc Discs can make noises Quote Link to comment Share on other sites More sharing options...
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