12 votes

Chain is slipping relative to large chainring but not the small one

From looking up the specs I presume your crank is FC-M8000-2. If you're saying that the crank arms are moving while the big ring and chain remain stationary in space, and the rear cog didn't move, the ...
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10 votes
Accepted

Chain slipping on middle chainring

I expect that after 10,000 km your chainring also needs to be replaced (frankly, I find it astonishing that you made it that far without replacing anything else. That's amazing.). Am I correct in ...
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  • 930
9 votes

Chain slipping on middle chainring

Cogs and chains "wear together" (regardless of whether they are front rings or rear sprockets). The old chain does not slip on the ring, because the old chain's rollers are worn down. They have an ...
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  • 2,593
9 votes

Rear derailleur needs a couple pedalstrokes to change gear

Only 500 km from new? Sounds like cable stretch where the inner cable increases in length from new as it beds in. Did you use up your free service? Most new bikes from shops come with a 2-8 week "...
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  • 96.8k
9 votes

Chain loses grip under load in higher gears

The comments above are probably correct; if your chain is new, then the issue is likely a worn cassette. Because they wear out as a pair, chains and cassettes are often replaced simultaneously. A new ...
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7 votes

(Apparent) chain slippage causes on new bike - usual culprits already eliminated

If everything is shifting smoothly and the hanger is aligned, it's very likely the freehub body slipping intermittently, which feels much like the chain slipping. Usually it takes a visual to be sure ...
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6 votes

Need new crankset for a 15+ year old bike [chain slipping on gears]

If you just want to go with something basic that's close to what you have, it's easy to get a replacement repair type crankset for this sort of bike. Check your tooth count, but it's probably 42/32/22,...
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6 votes

Replaced chain and cassette, now new chain slips in a specific gear

You have a mid-drive (Bosch) motor according to search, in my experience these can be very hard on drivetrains, for two reasons. One, the motor puts the extra torque through the chain and cassette, as ...
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  • 11.4k
5 votes

Roadside / Temporary fix for skipping chain

The only ''quick fix'' is to find a gear combination that works and hope for the best. Spending a few pounds on a chain wear checker will save you ever having to be in this position as you can check ...
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  • 8,910
4 votes
Accepted

Chain slipping in cassette when under load, could a different type of cassette work better?

The chain will typically slip under the following conditions: 1. the chain is worn out (this can be measured with a cheap tool, or by your LBS). 2. the cassette is worn out 3. one or more of ...
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4 votes

Shimano 105 rear shifting issues

Assuming that the cabling is clean, that the derailleur is nicely indexed and well alligned, the derailleur hanger not bent, and the chain correctly moves lateraly +/- 4mm for each gear up or down, ...
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4 votes

My chain slips despite new parts and tuneup

I presume all the new drivetrain parts were replaced close enough together that they were all new or new-ish at the same time. If on the other hand just the chain was replaced, the cassette or rings ...
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4 votes
Accepted

(Apparent) chain slippage causes on new bike - usual culprits already eliminated

The freehub was the issue. As it turns out, the bicycle manufacturer (Pinnacle) have issued a recall on the rear wheels of a small number of units of both my bike model (Arkose 4, 2016) as well as ...
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  • 235
3 votes

Fixed Gear crank arm slips

Your lock ring is loose. Normally the cog is quite tight from pedaling and you can do some braking with it. When you brake harder it breaks loose and unscrews until it hits the lock ring. This is ...
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  • 19.1k
3 votes

Drivetrain wear -- questions on chain elongation and skipping

Regarding your second question about exactly how worn a chain has to be before it skips on sprockets that are also worn, I don't believe that a nice clean engineering analysis is possible, because you ...
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  • 2,621
3 votes

Drivetrain wear -- questions on chain elongation and skipping

According to Park Tools: A worn chain shifts poorly and wears sprockets at an accelerated rate. The CC-3.2 is a go/no-go gauge designed to accurately indicate when a chain reaches .5% and .75%, ...
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  • 1,418
3 votes

Chain slipping on middle chainring

Yes a new chain can skip in either an old chain ring or old cassette. The length between chain lengths needs to match. So the old chain matched up to the old ring. The new chain does not match up ...
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  • 15.4k
3 votes

Chain skipping on new freewheel and chain setup - What went wrong?

I have experience with DNP freewheels (7 speed, 11-28) and KMC 6-7 speed chains. I had exactly the same chain slip problem (literally word for word) with chain slipping and managed to fix it with ...
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  • 2,593
3 votes

Chain skipping mid cassette after a clean

It's possible that during cleaning a grain of sand, for example, has become stuck in the chain causing a stiff link which does not travel cleanly over the cogs. Cleaning chains and cogs often involves ...
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  • 1,660
3 votes
Accepted

Downtube shifters won't stay in low gear on rear derailleur

Downtube shifters are usually called "friction shifters" and friction is key when fixing the issue you describe. I own and periodically use an old Cannondale with such system. Every now and then I ...
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  • 334
3 votes
Accepted

Chain slipping between frame and gears

What is likely happening (which David and Daniel describe the fix to) is that your rear derailleur has become maladjusted and is moving the chain further outboard--and off the sprocket cluster--than ...
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  • 6,878
3 votes

Chain slipping on brand new bike, bike shop is stumped

The problem turned out to be the crank assembly. Apparently the chain ring offset on the original crank was wrong. The replacement that Shimano sent (having been given the bike year/make/model/...
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  • 171
3 votes

Chain is slipping relative to large chainring but not the small one

By far you have to replace the big chainring. This is waaaaay abused right now.
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  • 460
3 votes

Roadside / Temporary fix for skipping chain

Some ideas that might have helped, some Degrease/wipe the chain and chainring and cassette. By removing grease/lube off the outside, it might be a little less slippery. Remove a link of chain to ...
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  • 96.8k
3 votes

Replaced chain and cassette, now new chain slips in a specific gear

The chain should not touch the frame of the bike at all. It will destroy the frame of the bicycle. The shop should never have returned the bike to you in that condition. Request to speak with the ...
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  • 621
2 votes
Accepted

I cleaned my cassette and changed my chain, now my freehub is slipping. What are the possible causes?

It is likely that your cassette is worn. A new chain on a worn cassette will skip, because of the mismatch of the shape of the teeth on the cassette with the chain's spacing (which is shorter than ...
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  • 45.5k
2 votes

Rear derailleur needs a couple pedalstrokes to change gear

The general concept of adjusting rear index shifting: If the derailleur is slow shifting to a larger cog then the cable is too loose (not enough tension). To increase cable tension unscrew (turn ...
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  • 1,309
2 votes

Chain skipping mid cassette after a clean

There are a few possibilities here: 1) Cleaning the cassette took away the gunk keeping a slightly worn cassette from showing. If you use the middle gears most, they may be more worn than the rest. ...
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  • 29.3k
2 votes

While pedaling standing up, bike crank gives in as if shifting, what is causing this?

A comment by @user10512 diagnosed the problem and provided the right solution exactly (see below). It was a shot rear wheel hub causing the chain to slip on front chainrings. I didn’t think to ...
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2 votes

When starting to pedal, it takes half a rotation to "catch"

If chain us not slipping then id say you have a busted freehub by the sound of it. Take the cassette off, remove the freehub inspect the paws check for excess grease or lack of. Otherwise look at a ...
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  • 428

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