Currently, the Redshift Dual-Position Seatpost is only offered in one diameter (27.2mm). 

If your current seatpost is larger than 27.2mm (common sizes include 30.9 and 31.6mm), you'll need a shim to fit the seatpost properly in your frame. We sell a variety of shims which you can add to your order on the product page. 

As of right now, we have the following shims available:

  • 28.6mm
  • 29.8mm
  • 30.0mm
  • 30.4mm
  • 30.9mm
  • 31.6mm
  • 31.8mm