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The ZRP lift spindles are also ski bolt back (SBB). Being in line with the ball joints makes for a more precise steer, less steering effort, and hold a line better. Examples: any other G4/5 sled that is not a Summit or Freeride, all past XM's, all the Polaris sleds.... Next year's Freeride spindle is having the ski bolt moved back "to make steering easier and more predicable." Too bad it will have the DS4 ski which will negate any benefit that would've been realized. Look at the folks putting RS spindles on their Backcountry's, gotta be a good reason. Basically, mountain sleds need easy and precise steering as well, just like the other sleds.From my experience the elevate spindles from IceAge have the most positive feeling. Less feedback in the bars, easier to hold an edge, and don't create unwanted steering effort. The IceAge spindle ski pivot bolt is moved rearward slightly which helps with the steering effort and handling. ZRP is a little taller and more inline with the ball joints which I assume would introduce heavier steering. I'm not sure why being in line with the ball joints is the best solution besides just a marketing ploy to differentiate from competitors? Maybe someone can shed some light on this?? Both great companies and parts that achieve the same end goal imo.