These are the Kenda K-Rads that come standard on all our bikes. Of the many 24" tires we tested, these were the lightest in their width, cornered well, were the more resilient against flats, and offered the best average grippiness accross various surfaces. 

Size: 24x2.30
ETRTO: 58-507
Max PSI: 80 (60 when using Tubolitos)
TPI: 60
Compound: SRC
Weight: 650±30