I would normally suspect that my son had screwed the chains up in installation, but both chains were installed by Mt. Airy Bikes in Maryland where he purchased the bike. They would not make the same mistake twice. GeorgeS
On Apr 29, 1:07 pm, tarik saleh <tariksa...@gmail.com> wrote: > I have had a fair number of chains break for one reason or another > over the years. Most were due to not using the "right" pin for the > shimano chains when they went to the special pins. I try to avoid > using the "special pin" chains and use the masterlink types almost > exclusively, thus this failure never happens anymore to me. > At least one was broken due to particularly inelegant shifts that have > actually bent the chain and caused a plate to come off a pin. Also > having a single speed chain derail when you take a power stroke can > put a kink in it, probably leading to a bent or broken chain. I had > this one happen a few weeks > ago:http://tsaleh.blogspot.com/2009/03/never-done-this-before.html > I am guessing this was a minorly tweaked chain from a derailment that > failed in fatigue over time. I have had things like that happen > before on my single speed mountain bike and cross bike which caused > the chain to separate completely with bits of broken in half plates > attached to the chain. Sometimes it looks like the crack started on a > logo stamped on the plate. This one I rode home, before I figured it > out what was going on, it was obviously bent, but I did not realize it > was separated until I got hoime. Kind of neat. > > I think breaking or bending chains is fairly common. I am always > surprised when people say they have never heard of it happening. > Mostly due to installation error at some point, but you see all sorts > of things when you ride lots of different bikes over lots of different > conditions, and when you work at a shop that look to be due to defects > in the plates, or maybe hitting something big or inelegant shifting > under load. > > My favorite one was when I was on a group ride in the rain and a > buddies chain came off and slid a few feet and neatly disappeared into > a gutter. He took the BART home from that ride. > > Anyhow, it happens. Make sure you install it correctly and make sure > you replace bent chains before they crack/depin. > > Tarik > > > > On Wed, Apr 29, 2009 at 11:42 AM, Doug Peterson <dougpn...@cox.net> wrote: > > > Similar thing happened to one of my touring buds a couple of weeks ago. It > > was a 9 speed and he's a big guy who pounds the pedals. First time was on a > > climb and he was able to take out the offending link to get going. Later in > > the same ride it started making noise on a flat section and he found one of > > the outer plates hanging loose, just waiting to fall off. As far as I know, > > he just replaced the chain and did not find any obvious cause. > > > I've never had a chain fail but have seen it happen, usually older bikes > > that have been neglected. Never on one such as your son has. > > > dougP > > > -----Original Message----- > > From: rbw-owners-bunch@googlegroups.com > > [mailto:rbw-owners-bu...@googlegroups.com] On Behalf Of GeorgeS > > Sent: Tuesday, April 28, 2009 8:03 PM > > To: RBW Owners Bunch > > Subject: [RBW] Query Concerning Chain Problem > > > My son has a Romulus he purchased about six months ago. Several weeks > > ago he was out on a long ride and his chain broke. I have been riding > > bikes a long time and I've never had a chain actually break in use and > > I've never known anyone who has had that happen. He said that on > > examination the outside plate simply peeled back at several places and > > separated from the pin. That left the inner plate holding the chain > > together and then that went. He said he did not hear any noise until > > shortly before the chain broke and it was obviously the plates hitting > > the RD cage. He took the bike back to the bike store where he bought > > it and they said they had never seen such a thing and put it off to a > > defective chain which they replaced and sent him on his way. On > > Sunday the same problem started to happen. After about 30 miles he > > said he started to see the plate on the outside start peeling back at > > three points on the chain. This time he was able to get back to the > > car before the chain broke. The bike store kept the bike to show to > > their ace mechanic and my son is supposed to pick it up later in the > > week. Anyone ever heard anything like this? The cranks are Sugino > > and the derailliers are 105's. He is riding on good roads in Maryland > > right out of DC. > > GeorgeS > > -- > Tarik Saleh > tas at tariksaleh dot com > in los alamos, po box 208, 87544http://tariksaleh.com > all sorts of bikes blog:http://tsaleh.blogspot.com --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bunch@googlegroups.com To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en -~----------~----~----~----~------~----~------~--~---
