If you're talking about the pivot, I'd leave them folding for street use. Less likely to get broken in a low speed tip over. On the track you're more at risk for a low side so I'd opt for the protection of fixed pegs.
The brake lever...first time I tried it and the rubber spinned on the shaft, my foot went right off the peg since I had flat riding shoes on with no heel. It doesn't spin any more though.
I replaced my grips too. The left one just felt loose. I don't know if maybe it spun around at one point, but it wasn't lined up with the right. They opened a new Cycle World near me and they just happened to have 717 grips in stock in titanium and black. Safety wired them too.
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