I run the 6.5 in my caster S10b 4wd, a 4.0 SCT (Red Can) on my SC10 4x4, a 8.5 on my T4, a 7.5 in my B4.1 WC and a 1900kv in my Caster EX1.5. All are awesome and have had 0 problems with them, plus I have a 5.5, 10.5, 13.5 and 17.5 spares and ready for anything and did not break the bank. Very happy and will keep runing them