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

Best Black Friday E-Bike Deals 2024 | Up to $1,700 in Savings

New: Take Part in the November Giveaway: Starts November 18th


Chain leaves rear roller
#1
I have a SRAM APEX 9 speed system (2 chainrings) 3 years old that has worked well until I took it apart to clean it. I put on a new chain too. Now in high range/low gear (crossing over) the chain jumps off the distal derailleur wheel, causing me to have to get off and reposition it. It is clear that the angle of the chain going from the big wheel on the cluster to the big chainring is causing this. It seems like the guides on the sides of roller wheel should be close enough to prevent the chain from jumping off. Did I put it back together incorrectly? Is the chain too short ? All opinions welcome.

[attachment=4071]
  Reply
#2
pic to narrow. lets a side view of the whole chain around the cogs thru the pullys
There are two kinds of people in the world, "Those who help themselves to people, and those who help people!"
  Reply
#3
(04-12-2013, 10:01 AM)painkiller Wrote:  pic to narrow. lets a side view of the whole chain around the cogs thru the pullys

That's a really hard picture to get -very busy background. I will give it a try tonight. Here's the latest thought. There are two wheels (pulleys) on the derailleur cage, big and little. The SRAM documentation never shows them clearly but most pictures of the cage show the idler pulley (the wheel most distal to the hub) as equal or bigger than the guide pulley (close to hub). I currently have the small one in the idler position. Maybe I have them switched?
  Reply
#4
That is entirely possible. Can't tell from your picture but make sure that the chain is properly running through the derailleur. It wraps around your rear cassette and passes overtop of the top pulley gear and then around the back side of the lower gear.
  Reply
#5
Not the best pic, but the chain should look like this if it is ran correctly
Have fun and just enjoy the ride
  Reply
#6
Did you remove and refit the jockey wheels?
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
Second wheelset for ebike.
Today 01:41 AM
Moving in Style: Beyond Regular Transpor...
Yesterday 09:23 PM
Tire Sizing (Or How to Buy A Tire)
Yesterday 12:36 PM
The Roaming Radrunner Vlog 1 Why ride ...
Yesterday 09:17 AM
Recording Bike Rides
11-20-2024 01:37 AM
Ketone Ester $$$
11-19-2024 01:04 AM
Trek domane tyre
11-18-2024 01:58 PM
Old fossil buys Ebike
11-17-2024 06:39 AM
Bike bus
11-17-2024 12:14 AM
Humber "Eiffel Safety" bike 1800s
11-16-2024 03:05 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
22 posts
no avatar 2. enkei
19 posts
no avatar 3. GirishH
14 posts
no avatar 4. Flowrider
11 posts
no avatar 5. ReapThaWhirlwind
11 posts