Interesting corporate intrigue. I had K-Drive on my first R3 and really liked them. Last year when I got my second R3, there was no K-Drive anymore. I found the CS4's, which supposedly took over K-Drive and got them. They're not bad but not as good as K-Drive, firstly because of the synthetic, Iparex, which is better than what CS4 uses, and the click mounting, the patents for which Longride must have acquired. The Longride model numbers are the same as the K-Drives. I believe I had the 147.