I put a set of doubles on my Z tonite (lowlift over lowlift) and i cut a property and couldn`t be happyer with the results. Then my old man came out to see them and said , "take them off . you cant run those with such a narrow belt, and those bearings in your spindles are gonna get worn out alot faster. If they were so good the deck would have came with 6 blades instead of 3." I`m using standard airens/gravely parts from the dealer. Will they wear out the belts and bearings faster?