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The bike is about 15 years old. The size of tyre is probably 28.

I want to change the old chain. I am not sure which chain I can put to the bike.

Does any chain which length is enough for 28 fit my bike?

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Post more information: picture ideal, description of gears better. Does it have derailleur? In that case 3/32. If it is not using derailleur then 1/4 inch. To get the length right, compare to existing chain. –  ʍǝɥʇɐɯ Jun 12 '11 at 15:12
    
Chain length isn't particularly vital -- most chains will come with extra length and you use a chain tool to shorten it to the correct length. This is why so many wrenchers have key-chain fobs made of bits of leftover chain. –  Neil Fein Jun 12 '11 at 16:45
    
@Mathew, I suggest putting that as an answer, as I tried to come up with an answer that says much more and failed. Maybe say "BMX/singlespeed chain" as well as 1/8" (I assume 1/4 was a typo :) –  Мסž Jun 15 '11 at 1:27
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First one needs to know if this is a derailleur bike or one with a multi-speed hub. Most likely 3/32" (internal width) for derailleur (this would be called a "5-speed chain") or 1/8" (internal width) for the multi-speed hub (this would be a "fixed gear" chain). –  Daniel R Hicks Jul 19 '11 at 11:17
    
My first thought is that, if this bike has a front derailer, it'd use the same size chains the old 10-speeds used. But aside from that, I've got nothin'. An interesting question. –  Neil Fein Jul 19 '11 at 19:49
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up vote 2 down vote accepted

To directly answer your question, no, any chain which is long enough is not compatible with your bike. No one here can tell you what chain will fit without a lot more detail in your question, but this is a good place to start. Daniel posted that link as a comment on my earlier answer.

Ask your LBS. They will know once they see the bike. Or measure the width of the outside chain plates with a vernier caliper on the old chain.

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