Quote:
Originally Posted by JacRyann
Well.... it depends upon how much is "good enough". If "stronger" is better, then we should all be running 632 chains. BMX and velodrome riders can actually generate twice as much torque on their crank-spindle as a N250 can at the output-shaft in 1st gear (+250 lb*ft vs. 128). Those bikes typically use size 410 chains with clip-type master-links all the time.
Helps to use as large sprockets as possible to reduce chain's bend-angle as it wraps around front-sprocket. I have 18/59t combo for slightly lower-gearing than stock. I haven't had any problems with my 428 chain's clip-on master-link and the previous owner ran the same configuration; as have many others.
Main issue that's been identified is low-quality master-links that wear quickly. In which case, distance between pins will increase and may actually undo the clip by spreading. That's more of a materials and QC issue than design though.
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That 415 chain is also moving a 300 plus pound motorcycle not to mention what engine braking does to the chain. If your comparison to the torque applied to a bicycle chain was an accurate one then it would mean that a 410 chain would work for a 300 Ninja. It will not.
Many people think that any 415 master link will work with any 415 chain, 520 master with any 520 chain, etc. They will not. At least not for long. No matter the chain size, the master link is always the weakest part of the chain. There is more to a master link than the clip or rivet simply holding the sideplate on. It is a matter of clearances and the strength of the link as a unit. There is a reason that rivet type master links are used by race teams. It's because they are stronger. And when you're talking about using a 415 chain that wasn't meant to be used on a 250 Ninja that little extra bit of strength can make the difference between winning and watching the race from the side of the track
Your mention of 428 chain really doesn't apply because it is much stronger than a 415 chain.
I've been through the use of clip type master links, I know how to install them, and I've always used the correct link, yet I've still had them come off of some of my racebikes. And that is even after safety wire and silicone. Not worth the risk of a DNF for me.