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Re: #25 & #35 chains
We at team 47 have used both #25 and #35 chain in various applications on the robots. Each has its own set of advantages and disadvantages. Yes, 35 is heavier, but easy access to a very wide variety of sprocket sizes is a plus.
#35 is also very forgiving as far as needing exact chain length and how to deal with chain slack, or to eliminate skipping teeth or rolling the chain off.
#25 is better when considering position sensing, it should give you a more precise method if encoders are driven by the drive system chain.
So, there are a couple more things to consider when choosing.
Both will work, just depends on what is important and what you are willing to live with.
Mike
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