Bent Chain Drop Pin
#1
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Senior Member
Joined: Jun 2008
Posts: 315
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From: Kent, WA
Bikes: '07 Specialized Tarmac Pro
Bent Chain Drop Pin
I was riding a TT this weekend when my chain got knocked off going through a roundabout and hitting a big pothole. I managed to put the chain back on and finish the TT.
Today on my ride I noticed the chain drop pin (The pin between the crank arm and big ring) is significantly bent. It appears that the pin was originally swaged into a hole in the chainring. It's partially pulled out of that hole now, but hasn't fallen out. This on a SRAM Red Crankset btw.
I'm trying to decide the best course of action. I've already adjusted the upper limit screw to make sure it's as close as possible to the chain without rubbing. The options I've been thinking of so far include: Leaving it bent, removing it and going without, maybe bonding it back in place or finding some other kind of screw/nut that I could make work in the same manner. I suppose I'm skeptical that it could be re-swaged back into place and the thought of replacing the entire chainring just for the pin seems a bit silly.
Sorry I don't have pictures, had to run to work right after my ride.
Any suggestions?
Today on my ride I noticed the chain drop pin (The pin between the crank arm and big ring) is significantly bent. It appears that the pin was originally swaged into a hole in the chainring. It's partially pulled out of that hole now, but hasn't fallen out. This on a SRAM Red Crankset btw.
I'm trying to decide the best course of action. I've already adjusted the upper limit screw to make sure it's as close as possible to the chain without rubbing. The options I've been thinking of so far include: Leaving it bent, removing it and going without, maybe bonding it back in place or finding some other kind of screw/nut that I could make work in the same manner. I suppose I'm skeptical that it could be re-swaged back into place and the thought of replacing the entire chainring just for the pin seems a bit silly.
Sorry I don't have pictures, had to run to work right after my ride.
Any suggestions?
#2
cab horn

Joined: Jun 2004
Posts: 28,353
Likes: 31
From: Toronto
Bikes: 1987 Bianchi Campione
How about just leaving it. As long as the pin prevents the chain from dropping and jamming against the crank near the spindle than it's fine. Properly adjusted front derailleur shouldnt ever drop it off the outside anyways. With use it should be harder to overshift, not easier as ferrules/housing seat into their respective spots. Take a picture if you like us to render a more accurate opinion.
#3
Senior Member
Joined: Aug 2005
Posts: 33,657
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From: Pittsburgh, PA
Bikes: '96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '20 Surly Midnight Special, All are 3x10. It is hilly around here!
If you want to replace it, just remove the damaged pin and use a short bolt with a nut on the outside of the chainring. You could file the bolt head (on the inside of the chainring) flat and very thin to keep it out of the chain's way while downshifting to the small ring. A drop of Locktite will assure the nut doesn't loosen.
#4
Thread Starter
Senior Member
Joined: Jun 2008
Posts: 315
Likes: 0
From: Kent, WA
Bikes: '07 Specialized Tarmac Pro
If you want to replace it, just remove the damaged pin and use a short bolt with a nut on the outside of the chainring. You could file the bolt head (on the inside of the chainring) flat and very thin to keep it out of the chain's way while downshifting to the small ring. A drop of Locktite will assure the nut doesn't loosen.
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