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

New: Take Part in the new April's Giveaway for a Chance to Win the Euybike S4 Pro Max ebike worth $1299


Mysterious Chain Jumping
#1
The derailleurs are perfectly tuned, brand new chain, cassette, and chain rings. New rear wheel, still same problem.
Whenever i stand up to pedal hard up hills or even on flat trail, my bike makes this disgusting noise and the chain skips or something. Sometimes the chain even falls off from the chain slip. (like in the video)
http://www.youtube.com/watch?v=wU_fdH-AOV8
All components are properly lubed with the appropriate lubricants... WTF. All i can guess is something with the bottom bracket?
I am so thankful for any insight anyone has, two shops have already tried to fix it and failed.

  Reply
#2
chain too long?

  Reply
#3
yo thepinto201 i am having same difficulties w/ 2 mongoose XR 250 mountain bikes. properly calibrated & lubed by professional bike enthusist . have contacted http://www.pacificcycle.com manufactures of mongoose bikes & warranty. they just keep blowing us off. my children can't ride across flat surfaces 40 feet without chain not climbing into rear spokes . need to accumate a class action against http://www.pacificcycle.com and Shimano...

  Reply
#4
Tough one!<br />
Looks like the chain is falling off the front chain rings. True? Does the same thing happen on all of the front chainrings or only on the inner? It could be flex in the BB or crank causing the chain line to get so bad the chain slips off. But that's pretty weird.
Can you get it to slip at a slow enough speed someone can jog next to you and try to spot where the chain is jumping? That might help. You've changed all the parts that would normally cause this. So either you have a mismatch (incompatible) part or something quite odd going on. Sadly, you may just need to keep trying shops until you find someone willing to spend the time to isolate it.
@billy_anders - something on your bikes need adjustment or replacement. I'm not defending Pacific Cycle, but I don't think this is a 'class action' issue. You need a good mechanic to figure out what is wrong and if there is a warranty issue, have them take it up with Mongoose directly.

  Reply


Possibly Related Threads...
Thread
Author
Replies
Views
Last Post
 
6,990
07-10-2014, 04:54 PM
Last Post: nfmisso
 
11,138
04-18-2011, 01:21 PM
Last Post: nfmisso
 
29,092
03-19-2011, 12:55 PM
Last Post: smart2k
 
9,801
02-08-2011, 11:30 AM
Last Post: Bill

Forum Jump:

[-]
10 Latest Posts
Front derailer not moving
Today 12:03 PM
What are the best cost effective ways to...
Today 11:53 AM
Tour of Luzon 70 years of Filipino Cycli...
Today 01:22 AM
RECOMMENDATION
Today 01:04 AM
Injury Recovery
Yesterday 07:33 PM
Good morning form Alberta CA
Yesterday 09:40 AM
Unlocking speed on my e-bike.
04-27-2025 01:04 PM
MTB handlebar width
04-27-2025 06:25 AM
What is your favorite MTB trail/route in...
04-27-2025 06:16 AM
Bridgestone Blouson bike.
04-26-2025 07:57 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. GirishH
22 posts
no avatar 2. enkei
16 posts
no avatar 3. Flowrider
15 posts
no avatar 4. meamoantonio
15 posts
no avatar 5. Painkiller
12 posts