I don't know for sure (I think it's a 2.52), but it's easy to figure out. Grab a tape measure or ruler and measure the peaks of the knobs on the inside of the track. Or count one row of knobs all the way around the track and divide the track length by that number. Example (if it really is a 2.52 pitch)....121" track / 48 knobs inside the track = 2.52 pitch.
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