The Super73-S1 and Z1 are not designed to accomodate more than 1 Rider at a time, and it's not something we can recommend; a Passenger can throw off the weight distribution and the Super73 may not perform as advertised.
The maximum weight capacity for the Z1 and S1 is 125 kg / 275 lbs.
The Super73-S2 and R-Series models can accommodate 1 Passenger along with the Rider. However, comfort may not be a factor on the R-series due to its seat design. An optional 2-Up* Extended Seat can be purchased separately to replace your current Super73 seat.
*The 2-Up seat is subject to availability, we encourage all Super73 advocates to sign-up to our email newsletter to receive notification of all Super73 product restocks. For aftermarket recommendations, we can only suggest reaching out to fellow Super73 Community Members through our Official Facebook Super73 Owner Group.
**The 2-Up seat is only compatible with the Super73 S-Series and R-Series models, it is not compatible with the Super73 Z-Series.
The maximum weight capacity for the S2, R, and RX is 147 kg / 325 lbs