You can order the spindles with a spacer and you can still run 16's, but I'm not forsure how the spacer works.
If you don't get it you can only run a 20" wheel (MAYBE 19") without doing any modification. If you want to run anything less you have to grind the bolt on the balljoint down or it will hit the inside of the rim, they don't tell you that until you get the instructions.
To make it easy on ya just by my 20" Maxim's off me
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