I have now had multiple sets of these “Ultra Sport” front forks from Frog Legs, Inc. on my chairs over the years and I absolutely love them! They let your front casters float over cracks and are great for vibration resistance, reducing back pain and leg spasms dramatically. They work great even on broken sidewalks and cobblestones. I have used these in my travels all over Europe and Australia. They are light weight, super strong, and have a very durable design; not to mention the just plain hot looking, CNC machined 6061-T6 aluminum parts. Good for every gearhead like myself.