Sam, K1 indoors looks like the are using the OTL Superleggero.
K1 Circuit (the outdoor place where they do the national championship race for rental league) uses the OTL E-Pro electric kart, which is a shifter roller with electric engine. Yours is more like the latter.
@Ruppdartkart i assume all the k1 rentals are on the same brand?
Nope. K1 is a large national “chain” that has dramatically expanded their footprint via acquisition of independent tracks around the country.
They have a league series for customers of their locations. The league is on the rental equipment, arrive and drive. There is a championship wherein regional champs get to go race at K1 Circuit, which is a different thing entirely. That is a full length FIA-CIK type track where SKUSA and other racing series also race. For that facility they have more powerful, racier karts.
I wrote about them here: