Join Date: Aug 2005
Location: Pittsburgh, PA
Bikes: '''96 Litespeed Catalyst, '05 Litespeed Firenze, '06 Litespeed Tuscany, '12 Surly Pacer, All are 3x8,9 or 10. It is hilly around here!
Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 306 Post(s)
The "root diameter" of the threads is 1/2". What you are measuring is the distance between the peaks of the threads and that will be less than 1/2". The folks telling you you have 1/2" threaded pedals are right and any bike shop will know what you want if you ask for this size.
For comparison, better quality cranks have 9/16" threads. I just measured the ID of a good crank that I'm absolutely sure takes 9/16" pedal threads and the measurement was 0.505" or right around 1/2".