Chain suck is the likely culprit. When the chain is dirty, lacks lube, or is otherwise out of spec (i.e., worn) is combined with a small chain ring with an off-angle chain line there can be a slight delay in disengagement of the chain from the small chain ring (the small diameter exacerbates this problem further).
Why does my chain keep slip when I pedal hard?
The most common reason for the chain slipping is that the cable is stretched, then the solution is to tighten the shift cable. If the problem is that the chain is too long they will need to shorten the bike chain. If there is any damage to the sprocket, derailleur, chain, or cable you will need to replace it.
What causes chain suck on a road bike?
The Mechanics of Chain Suck:
Chain Suck — when the bicycle chain fails to disengage from the teeth of a chainring (usually during a shift), sticking to the tooth (or teeth) as the chainring continues to turn, wrapping back up and around the chainring.
What is chain skipping?
Why Do Bicycle Chains Skip? When your bike chain skips between gears while you’re riding, or shifts twice instead of once when you try to change gears, the most common culprit is a loose cable. Your bike cables naturally stretch over time.
How tight should a chain be on a bike?
It should be tight enough that it only allows you to move it up and down about one inch. If it is sagging or much looser than that, you need to tighten that chain up. Chains often loosen when a bike does not have a derailleur. Derailleur is the gear changing mechanism towards the back of the bike.
What causes chain suck MTB?
Chainsuck is when your chain wraps up around the crank and jams into the frame. Everyone thinks it’s a design flaw in frame design but in all honesty with the exception of maybe 2 bike frames, there is no bike design that causes chainsuck. Chainsuck is caused most frequently by worn out, dirty, or unlubed drivetrains.