coupla notes: a) Pete's mostly right, I think. But I'm not sure that block chain was "uniquely" for track bikes. b) Block chain is lighter, by a couple of ounces. I weighed them once. c) "Strength" of a chain is likely to be largely about the thickness of the plates, and secondarily about the diameter of the pins. I don't think either changes very much through time, although I think that modern chains are made of better metal.
harvey sachs mcLean va
Pete Rutledge wrote:
I've been noticing a tendancy in some of the answers to this question to refer to a 1" pitch chain as a "block chain." Actually, 1" pitch x 3/16" width chain came in two varieties: block chain and roller chain. The block chain variety had a "solid" link between the cog or chainwheel teeth, often made of laminated plates. It was said to be stronger, more responsive, and yes, it made more noise (kind of nice) than the roller variety. The roller variety was open between the teeth and was quieter. Block chain would be considered a premium chain compared to an equivalent roller chain. Roller chain is much easier to find today because it was used on common, everday bikes before 1/2" pitch became standard. I think it's fair to say that 1" pitch by 3/16" width block chain was uniquely for track bikes; it is a lot harder to find and a lot more expensive when you do.
Pete Rutledge
Woodbridge, VA, USA