They are about 1/2 inch taller than the original wheels but no problem if you replace them all. They seem very sturdy and I'm a big guy at 220 pounds. and 6ft 1in, and if they fit me, they should fit most people. The original wheels started falling apart after 20+ years of use and getting this from them will make my day better. I put a special grease in the bearings and try to top it up every year.