https://www.amazon.com/Kart-Tires-145x70x6-18x9-5-8-18x9-5x8/dp/B083HL6Y9N/ref=asc_df_B083HL6Y9N/?tag=hyprod-20&linkCode=df0&hvadid=658219219629&hvpos=&hvnetw=g&hvrand=4907691505309476030&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9022455&hvtargid=pla-2065148460919&psc=1&gclid=CjwKCAjwqZSlBhBwEiwAfoZUIP6wFaGbfrQ3sMCLlZ9Wi7gdTmVwWZwAVnUqojJPpW077unni8heKxoCcFwQAvD_BwE
6" rims in front, 8" rims in back. It's a very common setup.