[RenegadeRick]

I've got one of these, but unfortunately, it's my bike!

It seems to only happen when pedaling hard in the middle ring in front and something like the middle ring in the back. If I shift the back ring up or down the pinging stops, but inevitably I find myself back in the pinging position. I figure this one is my favorite gear.

Any thoughts on what this could be and how to resolve it?

 

[bdamschen]

Can you wiggle that particular cog back forward and back? Does it only happen right when you shift into that gear or the entire time you're pedaling? Is your bike a hardtail or full sus?

 

[RenegadeRick]

Can you wiggle that particular cog back forward and back? Does it only happen right when you shift into that gear or the entire time you're pedaling? Is your bike a hardtail or full sus?

I have a 2005 Giant Trance 2 Full Suspension. It happens while pedaling, ping, ping, ping...

I haven't tried wiggling the cog. I'll check all of them on the cassette when I get home (which will be easy since the wheel is still off the bike).

 

[RenegadeRick]

The entire cassette seems solid. Any thoughts?

 

[binary visions]

Is it really a pinging noise, or could it be something creaking?

Have you tried looking closely at the chainrings/cassette cogs and making sure none of them are hooked or worn significantly? Also, put the bike on a stand or get the rear wheel off the ground somehow, and turn your pedals for a bit in each gear - make sure the chain is engaging the cassette smoothly and there are no stuck chain links.

 

[RenegadeRick]

Is it really a pinging noise, or could it be something creaking?

It really is a ping.

Also, put the bike on a stand or get the rear wheel off the ground somehow, and turn your pedals for a bit in each gear - make sure the chain is engaging the cassette smoothly and there are no stuck chain links.

It doesn't happen on the stand. It only happens while pedaling fairly hard.

Have you tried looking closely at the chainrings/cassette cogs and making sure none of them are hooked or worn significantly?

You know... that could be it.
One of the teeth on the big ring is hooked inward. Probably from whacking it on logs or rocks.

It could be that this hooked tooth is strumming my chain as it passes...

 

[binary visions]

Yeppers. Bend the tooth back if you can, that'll probably take care of the problem. It's probably only when the chain is at a certain angle.

 

[Wumpus]

Yeppers. Bend the tooth back if you can, that'll probably take care of the problem. It's probably only when the chain is at a certain angle.

I would suggest just trying to file it a little first. I snapped a tooth off a shimano ring way too easily trying to bend it back. Also, make sure the cogs in the back aren't bent especially the one right above the gear that is pinging.

 

[RenegadeRick]

I would suggest just trying to file it a little first. I snapped a tooth off a shimano ring way too easily trying to bend it back. Also, make sure the cogs in the back aren't bent especially the one right above the gear that is pinging.

I wish I had read your post first. I broke off the tooth trying to bend it back. There is only a small nub left, and the one next to it is already nubulized. I didn't hear the pinging any more though

We will see how it does on a real ride tomorrow.

 

[Wumpus]

I wish I had read your post first. I broke off the tooth trying to bend it back. There is only a small nub left, and the one next to it is already nubulized. I didn't hear the pinging any more though

We will see how it does on a real ride tomorrow.

Just an FYI: I did it to the middle ring, and everytime I put power to it, it would skip because the missing tooth was in the power stroke area. I rotated the ring 90* and haven't had any problems.

 

[RenegadeRick]

Just an FYI: I did it to the middle ring, and everytime I put power to it, it would skip because the missing tooth was in the power stroke area. I rotated the ring 90* and haven't had any problems.

Please define "power stroke area."

When the drive side crank arm faces the front of the bike is this area at 12 o'clock? 3 o'clock?

 

[Wumpus]

Please define "power stroke area."

About 45* to 90* behind each crankarm.

 

[binary visions]

I must have excellent luck, I've bent back three teeth on my chainrings. Sorry it broke off, RR - but as Wumpus said, if it starts skipping, just pull the ring off and rotate it.

 

[syadasti]

Press Ctrl-C to stop the machine from ping

 

[RenegadeRick]

I must have excellent luck, I've bent back three teeth on my chainrings. Sorry it broke off, RR - but as Wumpus said, if it starts skipping, just pull the ring off and rotate it.

Well the good news is I took it out for a good hard ride last evening and no more ping!

I didn't use the big ring (the one I broke the tooth off of) at all though. We will see how it does the next time I ride the road.

Maybe I should just replace it with a bashring, since it seems that I just like to whale it into stuff anyhow...