Why Bike Chain Keeps Slipping? And How To Fix It?

Why Bike Chain Keeps Slipping? And How To Fix It?

Dream Cheeky will help you know How To Fix A Slipping Bike Chain 2022: Things To Know

Video How To Fix A Slipping Bike Chain

Slipping or skipping bike chain is one of the most common bike mechanics problem that almost every cyclist’s face.

This problem can’t be an ignorable thing, it can affect the riding experience and make the bike unpleasant to ride.

Chain skipping can be caused by a lot of things related to the drivetrain system, most of the time can be a worn or not compatible chain, To fix this issue, it requires to do a deep inspection for multiple parts, in order for to know what exactly is the source of the problem.

Since there are a lot of reasons that can cause this malfunction, It’s can be hard to inspect what exactly is the source of the problem.

So in this guide,

We will talk about the inspection guide for all the possible reasons that can cause the chain to slip, skip, or jump from the gears.

# Why Does My Bike Chain Keep Slipping?

Most of the time, skipping or slipping bike chain can be caused by a very stretched chain or worn cogs teeth, after a long riding and hard use, the chain will get stretched, and start causing damage for both cassette and chainrings teeth, at a certain point the chain will lose its good mechanical contact causing the chain to slip or skip over the cogs.

# Why Does My Chain Slip When I Pedal Hard?

Stretched chain, when the chain starts to worn out it will show its first signs of slipping on hard pedalling, it could be in one cog or more but indicates that the chain have enough streche to be replaced.

# Bike Chain Slipping In One Gear?

Damage cog teeth, on the cassette some cogs used more than the others which makes them have more exposure to damage by the chain due the pedalling force, for this

# Here Are What Can Make Bike Chain Slipping

  1. worn chain.
  2. incompatible drivetrain parts.
  3. too much lube.
  4. worn cog teeths.
  5. shifting system problems.
  6. worn out freewheel body shell.
  7. bad attachment between freehub and wheel hub.

# 1. Worn Chain

The most common reason for the chain to slip on the cassette, or fall from the front chainrings is a worn chain.

After a long time riding under high-intensity pedaling, the chain will get damaged and stretched, the rollers will lose their normal shape (rounded) and plates elongates.

Therefore, the chain will lose good mechanical contact with sprocket teeth and start causing slipping under hard pedaling.

A tip replacing the chain as soon as possible will prevent damaging both of thecassette and chainrings.

Chain health can tested regularly by using a specific tool called a “Chain Ruler”, it comes in multiple shapes and each one has its specific way of use.

# 2. Incompatible Drivetrain Parts

This problem can appear after changing to a new chain or a new cassette without following manufacture references.

Picking new drivetrain parts without thinking about the compatibility may cause the chain to slip or causing cracking sounds while pedaling.

# 3. Too Much Lube

Too much added lube to the chain can makes it’s easy for the chain to slip over sprocket teeth, especially when the chain has some stretch.

Too much lube can lose the good contact between the chain and sprockets teeth, a small amount of lube should be OK for the chain to function properly.

Over lube chain can act like dust and gravel sponge, these materials will get mixed with lube to act like sandpaper which speeds up its worn out.

# 4. Worn Cog Teeth

After replacing a super damaged chain is it possible for the cassette and chainrings teeth to be also damaged, after putting a new chain, worn cogs teeth will cause the chain to slip.

When the chain gets stretched it starts to widen the space between the teeth by “eating” teeth heads.

When new chain get installed, the rollers can’t engage and sit properly within the teeth causing bad contact between the chain and the cog teeth and therefore the chain will slip.

One or two worn teeth on a single cog can be normal, but if most of the teeth got damaged, then it may need the cassette to be replaced.

When replacing a cassette, make sure to pick a branded and good quality one, changing or upgrading the cassette it’s not an easy mechanic process as it seems like.

# 5. Shifting System Problems

Bad shifting setup will cause the chain to slip or jump from one cog to another, also can make cracking sounds while pedaling.

Shifting problems can be caused by multiple parts on the drivtrain system, but mostly by the rear derailleur.

But in order to spot the source of the problem, it require to inspect and check all the following parts:

  • Shifting Cable: after a long time of use the cable will get stretched and lose to proper tension, for this ti may need to tension adjustment or more preferably completely change the cable.
  • Rear Derailleur: derailleur can lose its proper aligment after time, mostly the cag bend to the outer side, which may breaks the chain alignment with the cassette cogs, that may can cause the chain to slip under hard pedaling.
  • Derailleur Hanger: hangers are made up from fragile materials, they designed that way to save the frame from cracking during a hard contact, so they also can bend very easily after a hitting something or shifting under load, which causes bad shifting and chain jumping.
  • Bad Shifter: low quality shifter can lose the cable tension during the ride, especially when riding out of the saddle, which causes undesired gear shifting that seems like the chain is slipping.

# 6. Worn Out Freehub Shell

Quite rare to happen but it may worth checking.

Some freehub bodies are made up from aluminum with poor design, and it can get damaged after long hours of hard pedaling.

A damaged freehub shell makes the chain seem like slipping when pedaling hard, the sprocket will lose the mechanical contact with the freehub body shell.

# 7. Bad Contact Between Freehub And Wheel Hub

This part of the bike is almost taken for granted.

It doesn’t take any maintenance or cleaning for years, a lot of dust mixed with grease will prevent the “pawles” and “hub ratchet star” from reattaching together properly and for this they will lose the mechanical contact to turn the wheel, which makes the chain seem like slipping.

Depending on the design of the attachment system between the “pawls” and “freehub body”, some types can get damaged very easily and need to be replaced after a period of time.

# Inspection Recap

Here is how to check for slipping bike chain:

  • Verify chain health with the chain ruler.
  • Checking the chain compatibility with drivetrain parts.
  • Remove extra lube or grease from the chain.
  • Check sprockets teeth health.
  • Verify rear derailleur & derailleur hanger alignment with cassette cogs.
  • Check shifter cable tension.
  • Check freehub body shell.
  • Check freehub pawls and wheel hub ratchet star for engagement.

# Frequently asked Questions?

# Why Is My New Chain Slipping?

Damaged cassette or chainrings teeth, when the stretched chain left without replacment it may damage the normal shape of the cassette teeth sometime without showing any signs of slipping, but when putting a new chain which is shorter than the older one, it won’t properly fit mechanically with cassette teeth that were damaged by the old chain.

# Why Does My Chain Slip When I Pedal Hard?

Stretched chain, when the chain starts to worn out it will show its first signs of slipping on hard pedalling, it could be in one or more cogs but indicates that the chain has enough streche to be replaced.

# Bike Chain Slipping In One Gear?

Damage cog teeth, on the cassette some cogs used more than the others which makes them have more exposure to damage by the chain due the pedalling force.