I NEEDED SOMETHING TO GIVE ME ENOUGH CONFIDENCE TO RIDE A BICYCLE AFTER MANY YEARS OF NOT RIDING. THESE WERE PERFECT. I WAS ABLE TO REMOVE THEM AFTER JUST A FEW TRIPS AROUND THE YARD. MY BICYCLE HAS A CHAIN GUARD BRACKET WELDED TO THE REAR FRAME THAT INTERFERED WITH THE UPPER ARM OF THE TRAINING WHEEL. A FEW PASSES OVER A GRINDER TO REMOVE A VERY SMALL PORTION OF THE UPPER ARM FIXED THE PROBLEM. THESE TRAINING WHEELS ARE VERY STRONG AND SOLID.