UK Karting - Notice Board (Combined Forum) : Re: Chain length

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Re: Chain length
Posted by 'SimonS' on 15 Aug 2014 @ 21:08

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SimonSJoined: December 2004
Total Posts: 4
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We use 219HTM chain.

the number is an arbitrary number assigned to chains, so you have to look up the details in google

eg:
http://www.did-oltd.com/english/products/pdf/s_102-103.pdf

There you will find that the pitch, the distance between the centres of a 219 chain is 7.774 mm.

Also, you will find that the plate height, the height of the plate at the side of the link through a pin centre is 6.5mm

So, to find out how many links in a chain

hold the chain with a middle link horizontal
at the top
(since chains are even number of links, this will give you a horizontal link at the bottom too)

then measure from the top of the top link to the bottom of the bottom link.

subtract 6.5mm and divide by 7.774

I have just measured a chain and it is 410 mm long

subtract 6.5 mm = 404mm ( to get the distance between pin centres

divide by 7.774 =51.96= 52
multiply by 2 because there are 2 sides= 104
add in the 2 horizontal links= 106

The chain is 106 links long ( I counted).

You can measure the distance between pins but I found it more difficult than measuring top to bottom and subtracting 6.5.

somewhere else there's a figure that says a chain is worn out when it has extended 1% . That's 8.25mm on a 106 link chain or 4mm on a side.

So if your chain measured 415mm, not 410 then it is ready to be changed.

Just for reference a 104 link chain would measure 403 mm (402.974 but I haven't met anyone who can measure that accurately with a tape measure) and a 108 chain would be 418.5 mm

You'll see that there is only 3 mm between a worn 106 at 415mm and a new 108 at 418.5mm which is why I measure over the top of the link rather than try to measure the pin centres.

Does that help?

Message Thread:

Chain length by 'Matt97' (15 Aug 2014 @ 16:56)

Re: Chain length by 'Danlee' (15 Aug 2014 @ 17:06)

Re: Chain length by 'Matt97' (15 Aug 2014 @ 17:25)

Re: Chain length by 'BanzaiBoy' (15 Aug 2014 @ 17:58)

Re: Chain length by 'SimonS' << You are here!

Re: Chain length by 'SLK' (15 Aug 2014 @ 21:36)

Re: Chain length by 'Liam' (15 Aug 2014 @ 21:38)

Re: Chain length by 'Matt97' (15 Aug 2014 @ 22:34)

Re: Chain length by 'SimonS' (16 Aug 2014 @ 17:10)

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