Second year on a '12 675 with an Elka rear shock and running Pirelli SC1 rubber on the rear. I have had tearing like shown below everywhere I go and in all temperatures. I usually run 26psi hot off the track and use warmers for 45-60min prior to running. I have tried raising and lowering pressures, going to extremes on both compression and rebound, and rider sags from 15mm all the way up to 35mm. Elka originally sent me a 500# spring for my 170 weight but Im thinking this is too soft given the progressive nature of the 675 linkages. Using a zip tie on the shock it consistently ends up right against the bumper. I know that method isn't super reliable though. I've tried calling Elka a few times and they neither pickup the phone or return my messages. If anyone has any thoughts it'd be much appreciated.