I have the no-mar with large cones, but I have not done my GRiSO tires yet. I have done about a dozen other tires including a Triumph Daytona - where I used the large cones. All went well. But I did have a problem doing the rear tire of a Ducati Diavel. Got it wrong somehow... It is my friends bike. He took it to the dealer and they rebalanced the rear wheel and all was good... The annoying thing is, I don't know how I got it wrong...