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Where do you buy the thicker AL #25 sprockets ?
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Unfortunately I don't have a source for aluminum sprockets other than Andymark. I was just pointing out the change in quality in recent years.
These look interesting. Please let us know if you get pricing and availability. We tried using a large nylon sprocket from Mcmaster carr on our intake this year, and had trouble with the chain not engaging properly. The pitch seemed to be off for some reason.
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Generally chain "stretching" is every little join on every link wearing.
The reason you see more stretch on #25 is not because it is weaker but is because you have more links per inch to wear down.
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This makes a lot of sense. Team 359 uses bike chain which is 0.5" pitch, but much narrower than standard #40 chain. I'd be curious to hear from them how much stretch they see (if any). My understanding is that bike chain is way stronger than #25, but lighter than #35. Unless you could adapt bike sprockets, you would have to make your own. Other than that, it seems to be a great compromise between #25 and #35 chain.
Rob