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Pinging with Each Pedals stroke. Is it the Front Derailleur?

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Pinging with Each Pedals stroke. Is it the Front Derailleur?

Old 08-08-23, 04:01 PM
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Pinging with Each Pedals stroke. Is it the Front Derailleur?

Picked this bike up for $40. Works fine. Shifts without issue but there is a loud ping Everytime the right crank is at about 3 o'clock. Yes I've watched the Park Tool Videos but I think as wondering if the FD is even the issue. I've enclosed a picture. Not sure if video uploads here but I have video too.



Also wondering if the front chain ring is bent? Or the front derailleur (cage?) Is bent.
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Old 08-08-23, 04:06 PM
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If the teeth of the chainring touch the front derailleur cage (it looks like that is what is happening in the pic), something is bent and/or out of adjustment.
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Old 08-08-23, 04:20 PM
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A single tooth touching the cage seems odd. Unless that tooth is bent or somehow taller than all the rest, I'd expect that tooth contact would not be limited to a single tooth. In any case, proper FD height would have at least 2mm clearance above the ring, so tooth contact is virtually impossible.

However, a bent chainring might cause the chain the chain to touch. Or the sound may not involve the FD at all.

Start by raising the FD if necessary to establish proper clearance over the ring. Then, if you still hear the pinging, isolate things by turning the crank with and without the chain on. If you're still curious clean the cage and apply electrical tape to both plates and ride for a few minutes WITHOUT SHIFTING, if there's contact, you'll find cuts or tears in the tape telling you where.
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Old 08-08-23, 04:52 PM
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Thanks. I'll try tomorrow. To raise the derailleur I just loosen those two bolts, right? The bracket is bolted to the frame
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Old 08-08-23, 05:04 PM
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front ders are always mounted to the frame but with varying designs. I can't see how the OP's is mounted so can't answer the question "I just loosen those two bolts, right?".

Most/many ft ders user a hinged clamp surrounding the seat tube and these generally have just one bolt. But barring any non gear system aspect (other parts mounted/clamped near the der) these clamps have a lot of adjustment range to set the height and rotation best (note I don't say "right").

Some ft ders use a bracket that is mounted via the BB, the RH Bb cup traps the bracket against the shell's face (G mount IIRC). These have very little (as in none) adjustment range and really want to be used with the rest of the system being of compatible spec.

Some ft ders mount to a tab/bracket that is attached to the seat tube (brazed on). These usually have a bit more adjustment range then the G mounts do but less than the clamp around the tube types. Andy
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Old 08-08-23, 05:16 PM
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Originally Posted by RoadWearier
Thanks. I'll try tomorrow. To raise the derailleur I just loosen those two bolts, right? The bracket is bolted to the frame
Trick question?

Whether clamp-on or "braze-on" FDs typically use a single bolt.

It's possible that you have a "braze on" mount bolted to the frame. If so, there should be a single bolt holding the FD to that bracket. That's what you'd loosen to slide the FD up slightly. Be sure to keep the cage parallel to the chainring.
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Old 08-08-23, 05:36 PM
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I recently had a case where my chain got stuck in the front derailleur while shifting and widened out the FD cage just enough that my DS crank arm rubbed the cage with each revolution. This is something you can check to rule out.
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Old 08-08-23, 06:06 PM
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Originally Posted by Andrew R Stewart
front ders are always mounted to the frame but with varying designs. I can't see how the OP's is mounted so can't answer the question "I just loosen those two bolts, right?".

Most/many ft ders user a hinged clamp surrounding the seat tube and these generally have just one bolt. But barring any non gear system aspect (other parts mounted/clamped near the der) these clamps have a lot of adjustment range to set the height and rotation best (note I don't say "right").

Some ft ders use a bracket that is mounted via the BB, the RH Bb cup traps the bracket against the shell's face (G mount IIRC). These have very little (as in none) adjustment range and really want to be used with the rest of the system being of compatible spec.

Some ft ders mount to a tab/bracket that is attached to the seat tube (brazed on). These usually have a bit more adjustment range then the G mounts do but less than the clamp around the tube types. Andy

My bad it's one bolt. If I raise that won't that make the cable loose?
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Old 08-08-23, 07:01 PM
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Originally Posted by RoadWearier
My bad it's one bolt. If I raise that won't that make the cable loose?
Sure, but one can just tighten the cable again. Andy
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Old 08-08-23, 07:38 PM
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Wow...crappy picture of the year award
It looks like the derailleur cage is indeed to low and is being hit by a tooth or teeth on the crank.
Lift the derailleur to the correct height...if unsure googly is your friend...adjust as necessary and be on your merry way.
A cheap crankset may indded be a bit out of round...I'd not be surprised...I've seen far worse in our shop
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Old 08-08-23, 08:20 PM
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Originally Posted by FBinNY
Trick question?

Whether clamp-on or "braze-on" FDs typically use a single bolt.

It's possible that you have a "braze on" mount bolted to the frame. If so, there should be a single bolt holding the FD to that bracket. That's what you'd loosen to slide the FD up slightly. Be sure to keep the cage parallel to the chainring.
Specialized MTB Bike.. sounds like an E-type Mount... a plate is held to the frame by the Bottom bracket, There is typically room to adjust them up/down available where the der mounts to the plate or the frame tabs, or even riv-nuts into the frame, as i had on a CF bike recently... there was also a lengthy thread here about e-type ders. recently

https://www.jensonusa.com/Shimano-De...t=All+Products

Update.. it seems it is, indeed, a clamp-on der... with one allen screw.

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Old 08-09-23, 06:43 AM
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Originally Posted by RoadWearier
My bad it's one bolt. If I raise that won't that make the cable loose?
It'll probably tighten the cable...
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Old 08-09-23, 12:32 PM
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Originally Posted by smd4
It'll probably tighten the cable...
Pretty much what I was thinking.
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Old 08-09-23, 02:49 PM
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Have you looked to make sure it's not excess FDER cable sticking out and getting "flicked" by the crank?
OR
The left arm "flicking" a kick stand.
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Old 08-09-23, 03:03 PM
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Originally Posted by RoadWearier
Thanks. I'll try tomorrow. To raise the derailleur I just loosen those two bolts, right? The bracket is bolted to the frame
You may also have to loosen the cable to raise the derailleur.
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