I have run MAC100's for the last few thousand km and haven't noticed a problem. I keep the rear at 40. * * * * * * * * * * * * * * * * * * * The ST/RS Mailing list is sponsored by Jack Lilley Ltd. http://www.TriumphNet.com/st/lilley for more info http://www.TriumphNet.com/st for ST, RS and Mailing List info =-=-=-= Next Message =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=