Here’s a look at product from M2C Racing. These 17mm adaptors are made specifically for the Losi SCTE and will convert your SCT to accept 17mm wheels. Although not ROAR legal to run 1/8th scale wheels, it is a great add on to be able to run some extra tires/wheels that you have laying around the shop.
Here’s where I got them, and some info from M2C Racing:
https://m2cracing.com/product.sc?productId=520&categoryId=57
17MM HEX ADAPTORS FITS 6MM AXLES FROM .kIT INCLUDES (4) 17MM NUTS AND (4) 17MM HEX ADAPTORS AND (4) RETAINER NUTS
THIS IS A DIRECT BOLT ON SYSTEM . USES THE STOCK PIN . THE NUTS ARE A SURE LOCK DESIGN THAT WILL GREATLY REDUCE THE CHANCE OF THE NUT BACKING OFF. ANODIZED BLACK