02-14-2014, 03:39 PM
Hi. New member here.
Any ideas on a brand new "hybrid" bike with 18 speed Shimano Tourney gears fitted which is occasionally throwing the chain off the smallest (high gear) rear sprocket?
The stops are adjusted correctly as far as I can see, or at least so that the chain will only just go over onto the smallest sprocket from 5th. No cable tension as such in that gear, but no slack. Stops are moving the arm. Gears generally seem to change OK. There doesn't seem to be any slackness or anything in the arm, and idlers. The arm seems straight. Front gear was on the centre chain ring.
The chain came off the other night, and I looked at it today expecting the adjustment to have moved, but it was still right. This has happened a couple of times
It won't do it pedalling on a stand. It works fine.
No real experience with derailleurs, but years of experience with bikes, cars, motorbikes, and worked with electrical and mechanical equipment at one time.
So I know it's probably me!![Smile Smile](https://forums.bikeride.com/images/smilies/smile.png)
Thanks in advance.
Any ideas on a brand new "hybrid" bike with 18 speed Shimano Tourney gears fitted which is occasionally throwing the chain off the smallest (high gear) rear sprocket?
The stops are adjusted correctly as far as I can see, or at least so that the chain will only just go over onto the smallest sprocket from 5th. No cable tension as such in that gear, but no slack. Stops are moving the arm. Gears generally seem to change OK. There doesn't seem to be any slackness or anything in the arm, and idlers. The arm seems straight. Front gear was on the centre chain ring.
The chain came off the other night, and I looked at it today expecting the adjustment to have moved, but it was still right. This has happened a couple of times
It won't do it pedalling on a stand. It works fine.
No real experience with derailleurs, but years of experience with bikes, cars, motorbikes, and worked with electrical and mechanical equipment at one time.
So I know it's probably me!
![Smile Smile](https://forums.bikeride.com/images/smilies/smile.png)
Thanks in advance.