A few weeks ago, there was the question of French vs. BSC pedal thread interchangeability. I finally managed to measure a few pedals:
Campy NR FR: 13.65 mm (OD diameter of threads) TA FR: 1.382 mm TA latest model (FR + BSC): 13.80 mm Campy NR 9/16 x 20 (BSC?): 14.23 mm
(all measurements with a vernier caliper, so I'd say accuracy is about +/- 0.03 mm)
TA FR and NR FR both fit tightly in French cranks, with no problems. So the 0.15 mm smaller diameter of the NR doesn't seem to be a problem. The latest model TA is 0.043 mm smaller than the Campy BSC. I suspect that TA is correct, and these will work fine on BSC threads.
However, whether an NR FR pedal would work in a BSC crank is another matter.
Background info: Current production TA pedals are sold as "working for both BSC and FR cranks."
Jan Heine, Seattle