The details
- The RadRunner Passenger Package is sold by Rad Power and its dealers, and Rad lists it as compatible with the RadRunner 1, RadRunner 2, and RadRunner Plus.
- The kit includes a passenger seat pad with a vinyl top and thick foam padding, retractable foot pegs so the passenger has somewhere to put their feet, and a protective wheel skirt that keeps clothing and shoelaces out of the rear wheel.
- The seat mounts to the RadRunner 2's integrated rear rack, so no extra rack purchase is needed.
- The passenger sits slightly elevated, which Rad designed so a rider on the back can see over the driver's shoulder.
- The driver's saddle is not part of the package; it is only the rear passenger setup.
Why the kit beats a bare cushion
Plenty of generic cargo-bike cushions will physically strap to the RadRunner 2's rack. The problem is that a cushion alone solves the least important part of carrying a passenger. Foot pegs and the wheel skirt are the safety half of the equation: without pegs, a passenger's feet dangle near the drivetrain and wheel, and without the skirt, loose clothing can reach the spokes. That is why the owner community consensus is to buy the full package for regular passenger duty and reserve bare pads for cargo-only racks.
What owners actually do
Owners carrying adults or teens fit the Passenger Package and stop there. Owners carrying small children usually skip it and mount a rack-compatible child seat with a harness instead, since the Passenger Package has no restraint system and is not intended for kids who need one. Check Rad's current accessory compatibility list before buying any child seat, because rack-mount compatibility has changed across RadRunner generations. Either way, remember the passenger's weight counts against the bike's total payload rating, which is printed in the manual and on Rad's spec page: verify your remaining capacity before loading up.
The trap to avoid
The naming is the trap. Rad now sells a separate RadRunner 3 Passenger Package for the RadRunner 3 Plus, and listings for the two kits look nearly identical in photos. The RadRunner 3 version is shaped for the newer frame and rack, and the two are not interchangeable. When ordering, confirm the listing explicitly names the RadRunner 1, 2, or Plus in its compatibility line. Secondhand listings are the riskiest place for this mix-up since sellers often just write "RadRunner passenger seat."