Upgrades to entry level MTBs and Comfort Bikes

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A couple of recent pix,
Ben's new 20" BMX,
and his old 12" BMX, now modified for track use. :D
What gearing is Ben allowed to use on the track?

I just got my old Giant Sedona AL roadworthy for my Dad, test
rode it to work at lunch. The adjustable bar is comfy. I forgot the name of my 2yo entry level MTB Giant I ride with tri-bar pulled back for easy upright cycling, but that is a good work around, and keeps head up to enjoy the view more without straining neck. Grips are shot from parking in weather.