The more power you have the less important the friction losses are with O ring chains and possibly more important a good condition chain is. I only know of one senior driver whom uses O ring chains. Most use standard, or if you can afford it a high quality non O ring chain such as panther is the best of both worlds - low wear and friction. Best way is to test a std chain and an O ring next time you are on the dyno - that will tell you straight away, but use your own new chains - std and O ring not the one on the dyno which could be well worn, which doesn't always matter on a dyno if you use the same chain and you are comparing readings by changing other things. As always on a dyno it's not the number that matters it's the comparison on the same dyno using the same ancillaries and changing only what you want to compare!
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