after about 5200 miles a little over a year the back rim is pretty cracked. I noticed the rim needed a little truing a month or so ago but had not had the chance to bring it into the shop. I had just put new tubeless rim tape on with a new tubeless tire and new sealant. I was cleaning the rim up only to find the cracks. I think it's only on the drive side but there is a fair amount of them. of course the mechanic that deals with warranties is off till Tuesday. he used to work Sundays but he switched. so back to the bulls.