CNY rider
04-10-2008, 05:50 PM
So there I was JRA......
I was out yesterday on my relatively new rando bike (ridden one month last fall, then in the basement until 2 weeks ago).
First ride of the spring, 2 weeks ago, chain slipped off the inner ring. I figured it was a slight misadjustment of the FD low limit screw from the bike sitting all winter. I tightened the screw, no problems on the next ride.
Yesterday, the chain fell off the little ring twice in the course of about an hour. A creak also started that sounded like it was from the bottom bracket. I was then heading up my final climb to home, went to shift to the little ring, and dropped the chain again. Luckily I clued in at that point that something wasn't kosher.
What I found was shocking. There was a bolt holding the little ring on that was protruding inward, with the head in the process of being sheared off. Unfortunately it also took a good paint gouge out of the BB lug. The other bolts were loose. Looking at them, it seems like they are not long enough to go all the way into the hole in the spider and get good purchase.
Has anyone seen anything like this with a TA Carmina spider and Zephyr rings? I didn't put it together myself and have no experience with non-Shimano cranksets. Should the chain ring bolts be longer? I've tried to show that they don't come into the spider very far. If these really are the right bolts then how do you tighten them down?
This has me pretty shook up. I think a few more pedal revolutions on that ring and there would have been a distinctly unhappy ending if you get my drift.
View of the missing bolt:
http://i97.photobucket.com/albums/l221/eribrav/IMG_1775.jpg
Note the short appearing bolts in the 74 bcd holes
http://i97.photobucket.com/albums/l221/eribrav/IMG_1776.jpg
The sheared bolt:
http://i97.photobucket.com/albums/l221/eribrav/IMG_1779.jpg
I was out yesterday on my relatively new rando bike (ridden one month last fall, then in the basement until 2 weeks ago).
First ride of the spring, 2 weeks ago, chain slipped off the inner ring. I figured it was a slight misadjustment of the FD low limit screw from the bike sitting all winter. I tightened the screw, no problems on the next ride.
Yesterday, the chain fell off the little ring twice in the course of about an hour. A creak also started that sounded like it was from the bottom bracket. I was then heading up my final climb to home, went to shift to the little ring, and dropped the chain again. Luckily I clued in at that point that something wasn't kosher.
What I found was shocking. There was a bolt holding the little ring on that was protruding inward, with the head in the process of being sheared off. Unfortunately it also took a good paint gouge out of the BB lug. The other bolts were loose. Looking at them, it seems like they are not long enough to go all the way into the hole in the spider and get good purchase.
Has anyone seen anything like this with a TA Carmina spider and Zephyr rings? I didn't put it together myself and have no experience with non-Shimano cranksets. Should the chain ring bolts be longer? I've tried to show that they don't come into the spider very far. If these really are the right bolts then how do you tighten them down?
This has me pretty shook up. I think a few more pedal revolutions on that ring and there would have been a distinctly unhappy ending if you get my drift.
View of the missing bolt:
http://i97.photobucket.com/albums/l221/eribrav/IMG_1775.jpg
Note the short appearing bolts in the 74 bcd holes
http://i97.photobucket.com/albums/l221/eribrav/IMG_1776.jpg
The sheared bolt:
http://i97.photobucket.com/albums/l221/eribrav/IMG_1779.jpg