DR09TP50DH8162YY

The product was great, site was a bit complicated

I love the castors and will definitely recommend the larger size for office chairs with a few cautions: First I have an IKEA chair that takes a slightly smaller diameter mounting shaft so needed to drill out the receiver hole to 3/8 inch. Through some glitch in the average male's brain, every guy just assumes there's 3/8 drill bit in the garage...getting one in town adds time to the project. Second, though we have a low-pile Berber carpet in the office, the underlayment seems over thick and this creates difficulties for the wheel. With all wheels orientated in the same direction after a stop, it takes very little effort to keep moving in that direction. But when you want to back-up both the offset of a castor and the gravitational-well-like nature of the of the wheel "pit" causes the wheels to partially jam as they reorient the castor which I'm guessing is designed to follow the direction of "flow" for whatever it's carrying. An alternate design might follow the IKEA example of using smaller wheels assembled as dual rollers that appear to create a more symmetrical pit that when first forced in a new direction will allow the castors to swivel without catching the edge of the pit. Possibly a ball shaped castor would work if it was mounted over-centre as it not be subject to directional bias but it's hard to imagine how to build a keeper system to hold the ball from shooting off somewhere. Examples I can think of for rough terrain rolling are like the Mars Rover's wheels and those balloon tires that bike riders now use in the snow. Not practical for chairs. Anyway, the wheels themselves work fine and I'll recommend them to my grandsons who have no carpets in their house and are always complaining their desk chairs are "too slow in the hallway."