"My old 1971 NR rear could handle a 26 tooth in the rear I think that was about it. I never heard of it doing any thing bigger."
28. I ran a 28 on my 'Traut, the last time I did the Death Ride, and I needed it at 150 miles, 17% grade. 13-28/42-53. NR f ders don't like 7-sp freewheels.
Cheers,
Peter Bridge Greater Metropolitan Denver, CO Soon to be Greater Metropolitan San Diego, CA