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@mopedlar avatar
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UTC quote
As my 2021 GTS 300 Super HPE slows down, I'm hearing a chirping noise when the speed gets below about 10-15 mph. My brakes are not being applied when it's chirping. When you get over 10-15 mph or when you come to a complete stop, the chirping noise stops. I can't definitively tell if it's coming from front or rear, but I think it's from the front. Just started doing this today. Bike has less than 2k miles on it. Any ideas?
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UTC quote
I know you said you're not applying the brakes, but... generally, that sound comes from the brakes.

From the wiki: FAQ: Why do my front brakes make a whirring / cricket sound?
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UTC quote
Also, sound is notoriously difficult to diagnose via text descriptions. Any chance of capturing a video of it and uploading to YouTube?
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UTC quote
It's definitely not the brakes. I'm not even touching the brakes when it starts chirping.
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UTC quote
Mopedlar wrote:
It's definitely not the brakes. I'm not even touching the brakes when it starts chirping.
Can you elaborate on chirping? It's hard to diagnose sound from text descriptions.
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UTC quote
jess wrote:
Also, sound is notoriously difficult to diagnose via text descriptions. Any chance of capturing a video of it and uploading to YouTube?
Since it only chirps when the bike is moving, there no way I can get it on video without killing myself. No noise on the stand when at idle or when I accelerate from idle.
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jess wrote:
Can you elaborate on chirping? It's hard to diagnose sound from text descriptions.
It literally sounds like a bunch of birds chirping. No other way to describe it.
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UTC quote
Mopedlar wrote:
It literally sounds like a bunch of birds chirping. No other way to describe it.
I still think it's coming from the brakes, regardless of whether you are applying them. The calipers brake pads are still basically touching the disc even without being applied, and they're the one thing that is most likely to make noise.
⚠️ Last edited by jess on UTC; edited 1 time
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jess wrote:
I still think it's coming from the brakes, regardless of whether you are applying them. The calipers are still basically touching the disc even without being applied, and they're the one thing that is most likely to make noise.
I checked movement of the front wheel on the stand. No binding or chirping noise whatsoever as I rotate the wheel. That's why I didn't think it was the brakes.
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Mopedlar wrote:
I checked movement of the front wheel on the stand. No binding or chirping noise whatsoever as I rotate the wheel. That's why I didn't think it was the brakes.
They don't need to bind to make noise. The pads are literally touching the disc at all times.
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My wife has the identical bike and no chirping on slow down.
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UTC quote
jess wrote:
I still think it's coming from the brakes, regardless of whether you are applying them. The calipers brake pads are still basically touching the disc even without being applied, and they're the one thing that is most likely to make noise.
I agree with this. My 2020 GTS mades a chirping sound when I move it around with the engine off. I'm sure it's my brake pads rubbing on the disk. I figure it's just one of those things.

OP- Does the sound stop when you lightly apply the brakes?
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bluside wrote:
I agree with this. My 2020 GTS mades a chirping sound when I move it around with the engine off. I'm sure it's my brake pads rubbing on the disk. I figure it's just one of those things.

OP- Does the sound stop when you lightly apply the brakes?
The chirping noise does not stop when the brakes are applied.
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Mopedlar wrote:
The chirping noise does not stop when the brakes are applied.
Okay, here are your three options, in descending order of likelihood:

1) It's the brakes. I realize you are convinced it is not the brakes, but it is the most likely candidate.
2) It's the wheel bearings. No idea why it would only chirp at specific speeds.
3) You have an actual bird nest under the fender.

My money is on the brakes. That's my final answer. If you don't like the answer, sorry.

¯\_(ツ)_/¯
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UTC quote
Mopedlar wrote:
As my 2021 GTS 300 Super HPE slows down, I'm hearing a chirping noise when the speed gets below about 10-15 mph. My brakes are not being applied when it's chirping. When you get over 10-15 mph or when you come to a complete stop, the chirping noise stops. I can't definitively tell if it's coming from front or rear, but I think it's from the front. Just started doing this today. Bike has less than 2k miles on it. Any ideas?
10-15mph is typically the speed at which the clutch disengages. Above that speed the clutch is engaged, fixed, therefore no slip, and below the clutch runs free, also no slip. At the disengagement point there is slip and that slip could explain the noise.

Do you hear shortly a similar noise when you start from standstill?
If it is then it sounds like when there is slip in the clutch you have that noise.
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PeterCC wrote:
10-15mph is typically the speed at which the clutch disengages. Above that speed the clutch is engaged, fixed, therefore no slip, and below the clutch runs free, also no slip. At the disengagement point there is slip and that slip could explain the noise.

Do you hear shortly a similar noise when you start from standstill?
If it is then it sounds like when there is slip in the clutch you have that noise.
I don't hear the noise when I move from a standstill. Only on deceleration.
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UTC quote
You can record a video to capture audio without having three arms.

a. put the phone in a breast pocket
b. put the phone in a small fabric bag and hang it from the curry-hook
c. put the phone in a fanny-pack or similar

As long as the mic is free from obstruction, those with the Golden Ear may be able to give you a more educated guess.
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UTC quote
İ got the same bird its the brakes
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UTC quote
Is is more of a fluttering tweet/chirp accompanied by a bit of a whirr, or is it more of a screech?
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Shebalba wrote:
Is is more of a fluttering tweet/chirp accompanied by a bit of a whirr, or is it more of a screech?
Screech
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I'm guessing brakes.

probably picked up some debris that's caught in the pads and it's rubbing on the rotor. or, just the slightest difference in manufacturing tolerances.

or, something is rubbing on the tire. the rear inner fender is always popular for that.

or, you actually have a nest of pterodactyls up under the bodywork. which would be pretty rad, honestly.
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I guess the consensus is the brakes are the culprit. That's fine. I'll just keep an eye and ear on it and see if it gets any better or worse. Thanks everyone for your input. Much appreciated!
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UTC quote
I'll throw one more idea out there, though the age and mileage on your scoot don't support the hypothesis. I had what I would have described as a non-brake, chirping noise on deceleration down from 20ish to 10ish. It turned out to be the coolant pump bearing. No real sign the bearing was going other than the sound and a bit of coolant at the weep hole. Check your pump housing.
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phaskins wrote:
I'll throw one more idea out there, though the age and mileage on your scoot don't support the hypothesis. I had what I would have described as a non-brake, chirping noise on deceleration down from 20ish to 10ish. It turned out to be the coolant pump bearing. No real sign the bearing was going other than the sound and a bit of coolant at the weep hole. Check your pump housing.
I took her out again, still making the chirping noise on deceleration starting at about 15 mph. Checked the water pump housing. No leaks anywhere. I'm just gonna have to live with it unless it gets any worse. Thanks for your reply!
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without hearing the chirp for myself I would likely apply some break clean to the to brakes, while wheels are turned. If break clean failed to remove chirping the would likely do the same as you are thinking wait for noise to get worse to enable identifying what the cause is. Good luck, may your concern be alleviated soonest.
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UTC quote
I had a sound like this that plagued me on my 2009 GTV250. It ultimately went away when I replaced my variator at about 14K miles. Just another thing to consider.

Miguel
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UTC quote
i put frando brakes on a few months ago and they make a very annoying jingly sound when braking. one of the reasons I regret buying these brakes.
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UTC quote
SteelBytes wrote:
i put frando brakes on a few months ago and they make a very annoying jingly sound when braking. one of the reasons I regret buying these brakes.
Helpful info. These were on my upgrade wishlist. I assume it's not limited to just the front or rear?
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UTC quote
i have changed both bearings at my rear wheel, and i am about to do it again...maby it is that kind of chirping??
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UTC quote
Shebalba wrote:
Helpful info. These were on my upgrade wishlist. I assume it's not limited to just the front or rear?
frando rear was perfect but not worth the money as stock oem rear easily locks the rear wheel. I only did the rear to match the front style.

some people here have been happy with the frando front but I never got them firm. I took it to mechanic who power bled it and also activated the abs but no luck. did all the tricks I could find like holding the caliper high when bleeding and also trying strapping the brake lever over night. nope, never been happy. And the jingle sound when braking - aarrggh - so annoying.
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UTC quote
SteelBytes wrote:
frando rear was perfect but not worth the money as stock oem rear easily locks the rear wheel. I only did the rear to match the front style.

some people here have been happy with the frando front but I never got them firm. I took it to mechanic who power bled it and also activated the abs but no luck. did all the tricks I could find like holding the caliper high when bleeding and also trying strapping the brake lever over night. nope, never been happy. And the jingle sound when braking - aarrggh - so annoying.
If the rear brake was perfect and other owners have been happy with theirs, did you explore the possibility of a defective front brake?
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UTC quote
Shebalba wrote:
If the rear brake was perfect and other owners have been happy with theirs, did you explore the possibility of a defective front brake?
I'm in Australia and I bought them from Germany. Installed myself. Having the argument about refund/replacement sounded like too much effort. Whereas if it was down the street at the local dealer and they had installed them ...

The rear are a size and design that is very similar to original so not surprised that they just worked. Front are so much bigger and have the weirdness of the line in and bleeder being right next to each other which really makes me suspicious of the layout of the channels inside the calliper being no the best thought out, and with the considerable more total piston area being pushed by the same size master cylinder ...
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