Have questions or want to discuss cycling? Join Now or Sign In to participate in the BikeRide community.

New: Take part in the July Giveaway for VTUVIA SN100 Camouflage Fat Tire E-Bike $1679


Chain jumping off Chainring
#1
I have a Gary Fisher Marlin that's 10+ years old. I bought a bash guard and removed the big and small chainrings as well as the front derailleur. I'm not using only my old middle chainring up front. I first attached the chainring backwards, but noticed this when the chain was jumping off while the bike was still on the stand. I took the crank off, unscrewed everything, and put it back on facing the right way.

Went for my first ride this morning and the chain kept jumping off the chainring, especially when going over bumps and regardless of the gear I was in.

I hadn't had this problem before installing the bash guard, so what might I have done wrong? Could tightening the chainring on backwards have caused this?

Thanks, Jedi Mike
  Reply
#2
Mike - put the front derailleur back on, use the limit screws to lock it in position, no cable, no shifter, your problem will go away.

Read the 1 by X information on the web, you will find that your situation is very common.

Putting the chain ring on backwards may actually help - BUT it sounds like yours is very worn. Changing to a single speed chain ring designed for 3/32" chains will help. Your current chain ring is designed to assist with shifting, you do not want it to shift at all.

Shortening the chain (follow Shimano's recommendation no RD, wrap around big rear and front ring + 1") will help to get the chain tension higher.

Is your RD original - if so the spring is probably tired, and a new RD would help a great deal. I would replace the cassette/freewheel, RD and chain ring at the same time.
Nigel
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Cannondale Criterium value
Yesterday 10:47 AM
Ebike for riders 5ft tall
Yesterday 08:54 AM
First Metric Century
08-16-2022 03:26 PM
Help identifying date of manufacturing
08-15-2022 08:52 PM
Cycling photos while on holiday
08-15-2022 08:41 PM
Make a freewheel removal tool
08-14-2022 07:32 AM
Weak spring tension on the derailleur wi...
08-14-2022 07:18 AM
Woodsplitter in Pittsfield, Vermont
08-12-2022 06:19 AM
New Stator For My Ride1up Core 5
08-10-2022 08:49 PM
Jumps a Gear
08-09-2022 07:14 PM

[-]
Join BikeRide on Strava
Feel free to join if you are on Strava: www.strava.com/clubs/bikeridecom

[-]
Top 5 Posters This Month
no avatar 1. Jesper
16 posts
no avatar 2. ichitan
15 posts
no avatar 3. dinh thaihoang
11 posts
no avatar 4. ReapThaWhirlwind
9 posts
no avatar 5. Criminal
7 posts