The Ibera rack IB-RA5 will fit on the 6+ but you have to order the right one. You need to order the one that fits a bike with disc brakes. Also the 2 front mounting rods need to be lengthened so if you don't have a shop that can do that for you or you have no way to do that, it's not a rack for you. The rods that come with the rack are 9" long, Ibera sells longer rods that are 11" long, but that's not long enough to make the rack sit level on the 6+ST bike. I'll get a measurement of the length needed and post it here later. 14.5" length for front mounting rods for 6+ST I don't know if it's the same for the 6+ high bar.