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I am putting the 520 conversion on today, doing my R6 also. the R6 am dropping a tooth in the front but keeping stock gearing on teh S1K. Am doing it because rotational weight savings, on the S1K and giddy up on the R6 on Short Tracks.

Concerned a little about the strength of the chain and busting it.
 

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I did the Renthal 520 conversion with the stock 17/45 gear ratio. After 3000 street miles the rear teeth are significantly scalloped. Going to switch to the Supersprocket hybrid
 
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