interesting, have you got a link to the thread or can you remember what it was called?Just use a 12 inch ruler. Get the ParkTool one and modify it according to the thread I posted some weeks back. All commercial chain checkers are flawed.
Sheldon Brown page on chains.got plenty of 12 inch steel rulers but not a clue how to use one to check the chain stretch/wear?
Cheers Ed
Obviously it is easier to measure how much longer the chain has become if the ruler is longer than 12"! I bought a 24" ruler.Sheldon Brown said:The standard way to measure chain wear is with a ruler or steel tape measure. This can be done without removing the chain from the bicycle. The normal technique is to measure a one-foot length, placing an inch mark of the ruler at the side of one link pin, then looking at the corresponding link pin 12 complete links away. On a new, unworn chain, this link pin will also line up exactly with an inch mark. With a worn chain, the link pin will be past the inch mark. [For accurate measurement, the chain should be held under some tension -- either on the bicycle, or hanging. Also, use a metal ruler or tape measure. Wood, plastic and cloth all can expand or shrink.-- John Allen]
This gives a direct measurement of the wear to the chain, and an indirect measurement of the wear to the sprockets. first, let's look at how to do this with a ruler that measures in inches.
- If the link pin is less than 1/16" past the mark, all is well.
- If the link pin is 1/16" past the mark, you should replace the chain, but the sprockets are probably undamaged.
- If the link pin is 1/8" past the mark, you have left it too long, and the sprockets (at least the favorite ones) will be too badly worn. If you replace a chain at the 1/8" point, without replacing the sprockets, it may run OK and not skip, but the worn sprockets will cause the new chain to wear much faster than it should, until it catches up with the wear state of the sprockets.
- If the link pin is past the 1/8" mark, a new chain will almost certainly skip on the worn sprockets, especially the smaller ones.
This demonstrates why it is useful to have a ruler with a few graduations beyond 12". Usually rulers stop a 12", a convenient length, but for bicycle chains we want to know how much longer it is after 12", up to say 12 1/8th".How To Measure Bike Chain Wear With A Ruler:View: http://youtu.be/5okJdYrANt8
https://www.cyclechat.net/threads/chain-wear.171897/post-3475009interesting, have you got a link to the thread or can you remember what it was called?
Cheers Ed