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

New: Take part in the February Giveaway for a Reflective Backpack & Spine Protector from RiderBag


Loose chain on high gears
#1
Hi,

I have been doing some work on my bike to get it back in shape. Everything is working perfectly except when im using the high gears the chain become loose.

I also notice that it occurs when im only resting my feets on the pedals. But when I remove my feets from the pedal I notice that the slack from the chain goes away but my pedals are moving forward of it's own. I think that is the problem. Because the whole pedal section should be still and not moving forward of it's own when im in motion.

What could be wrong? The casette? The chain?

It is a 24 gears bike mostly with Shimano parts.

Thank you in advanced
  Reply
#2
I assume you mean that the chain sags on the top when you coast. If so that is most likely because the freewheel/cassette has excess friction, so that when the wheel is turning it moves the rear gears slightly clockwise. That's also why the pedals turn if you take your feet off - the rear cogs are turning because of the friction between them and the hub, and therefor rotating the chain, which turns the pedals. It may be that your freewheel just needs lube, but there are other possibilities as well. If by "high gears" you mean the smaller cogs in the back the sagging probably happens more there because the chain is already under low tension, especially if you are on the small chainwheel in the front.
  Reply


Possibly Related Threads...

Forum Jump:

[-]
10 Latest Posts
How to stay safe while biking?
Yesterday 08:55 PM
Chain for specialized rockhopper
Yesterday 08:41 AM
What kind of frame do I have here?
Yesterday 03:01 AM
Restoration of a 1980 Falcon Road Bike
02-26-2021 01:39 PM
New bike
02-26-2021 12:52 PM
Mountain Bike Purchase Advice
02-24-2021 06:33 PM
Pedals: Clip vs. Clipless
02-24-2021 05:33 PM
Just bought a 2021 TREK MARLIN 6 MTB
02-24-2021 05:28 PM
Favorite MTB brand?
02-24-2021 05:25 PM
1983 Trek 720
02-21-2021 08:04 PM

[-]
Top 5 Posters This Month
no avatar 1. Criminal
11 posts
no avatar 2. Jesper
9 posts
no avatar 3. ILv2MTB
5 posts
no avatar 4. Painkiller
5 posts
no avatar 5. nancy joshua
4 posts