Slimmed-down bridge sections and longer gripping pins. All new 17mm wrench-flat spindle ends.. The Trail mix is a lighter-weight version of the original pedal (still in production) that leans more toward trail riding with its longer pins, slimmer bridges, and knurl-free gripping surface. The pedals also feature our new 17mm hex-end spindle wrench flats that will accept the width of most adjustable wrenches - helping to simplify assembly when travelling. Replacement pins included (6mm allen key slot also included).