Wanted the 4in Kendra on my new mini st2 for the soft sand,  email back from Rad said they didn't know when they would be back in stock.
  I  went with the so called mongoose on Amazon for $37 with there 4 in tubes.  Tires fit on the existing rims, could be a bit more aggressive for soft sand but imo is a good cross for street and beach, much better then stock tires. We will see how they last.

Hi y'all,
I've had my new rad mini step thru for a few weeks and made a few modifications.  I should say I love my new rad and very happy with my purchase and the quality overall.
This old man butt needed a softer seat, added a back rack and front basket,  also a mirror. Changed the tires to the mongoose 20x4 tires for the Oregon soft sand.  Ya may not really be mongoose but I  really like the tires for the first few rides. 
  Looking forward to beach rides or just running to the store!😁