Repairing, maintaining, or replacing the chain on your bike that connects the front of the drivetrain (cranks, chainrings) to the back (cogs, cassette).

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Upgrading wheels on a vintage Peugeot Frame

OK so I have a Peugeot Galibier bike that consists of a Reynolds 301 steel frame. A while back the original derailer gave up the ghost while riding, bending the rear-wheel spokes in the process. I ...
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2answers
270 views

Chain loses tension on straight drop out

I have single speed bicycle with a straight dropout. The problem I'm having is that over the course of a week, the chain loses tension until eventually, if I do not re-position the back wheel again, ...
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2answers
669 views

Are lighter chains worth the cost?

I'm replacing chains on a number of bicycles, and trying to decide what chains to purchase. I'm a fan of Sram's master links, so I'm comparing the Sram PC-971 to the PC-991. The PC-991 is ...
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1answer
918 views

Why does my chain keep jumping off the front chainring on my 1x9?

My chain has a tendency to frequently jump off the front chainring. I have a 1x9 so it's not a front derailleur issue. It generally happens when I hit something like the lip of a driveway or sidewalk ...
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1answer
1k views

What would be the “definitive” formula to calculate chainstay length from sprocket size, chainring size and number of chain links?

Before I started to write this answer, I thoroughly read this question, its answers and comments: How do I calculate the diameter of a chainring from the number of teeth? So, my question tries to ...
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4answers
1k views

Eliminating chainslap on a 90's Stumpjumper

I have a mountain bike - a Stumpjumper hardtail frame with a Shimano drivetrain - where I'm getting a good amount of chainslap. Before I start fiddling with stuff, I'd like to understand the problem ...
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2answers
1k views

Chain drop under load

I have a problem. Today I was riding (flat-out) up hill, and went to shift up a gear on the rear, which caused the chain to drop off the front chain-ring (was in the big-ring, so dropped to the ...
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2answers
1k views

New Chain causing skipping on cassette - will this work itself out or is it unsafe?

I just installed a new chain on my 2002 Trek 2200 Road Bike. The old chain was a Shimano 9 speed that I installed 18 months and about 5000 miles ago. It had stretched modestly and was full of winter ...
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2answers
268 views

What kind of master link is most convenient for IGH / fixie / ss setups?

Here's a question related to this and this -- I've got a IGH bike and want to keep the drivetrain clean. I prefer to remove the chain for regular maintenance, but don't want to have to remove the ...
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4answers
853 views

Properties with Belt-driven Chains?

This reply about belt-driven belt got my interest here. It does not need lubrication at all according to the replier. What are other properties with belt-drive chain? Where does the idea come from? ...
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3answers
3k views

Why is my drivetrain so noisy after replacing the chain?

I ride an SE Lager fixed. On the 30th of May this year I did a bit of an overhaul, replacing the rear cog, chain, wheels, tyres and brake pads. I measured the chain last weekend and discovered that ...
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407 views

Upgrade my Rear Cassette from 12/25t to 11/28t

I have a Specialized Secteur 8-speed road bike with a Shimano HG850 12/25t rear cassette running on a KMX Z type narrow chain my crankset is a 52/42/30, I have done about 2,000 miles so it's probably ...