Ok thanks for the info, I'll keep an eye. Both of our runs are 1.2m so hopefully less of an issue. We went with a different (read cheaper!) range so hopefully it doesn't have even more of a tendency to twist.Bit late now but I redid the garage shelving earlier in the year with a mixture of Turrerman SX400 and Sx200 (8 bays in total covering about 12m in length). The sx400 is great, absolutely rock solid although the center braces under the longer shelves were a PITA to install. Less impressed with the SX200, the way the shelves sit on their rails is different and it induces a twisting action on the longer rails when under load.