9/16 or 1/2 Inch Thread?

Thargor

Is there some easy way to tell what the thread size on a pedal is, the difference is too small to measure with 100% certainty with a ruler and I dont have a callipers. The bike Im measuring is old, a Raleigh Reynolds 501 roadbike. There are a couple of numbers stamped into the pedal but they dont seem to mean anything, 170 directly below the hole where you screw it in and Taiwan 03, is there some definitive way for me to check that Im missing?

papac

Iirc, in days of yore 1/2 inch was really only used on kids bikes.Nearly all british adult bikes would have been 9/16.

Can you try it on a modern crank. They will all (bar bmx and kids) be 9/16.

I got a useable setof digital calipers for 7.99 in Maplins a while back.I am amazed at how much use it gets.

Thargor

I took the pedals off my Carrera Subway there and fitted them, they seemed perfect and I only bought that bike a couple of months ago so Im just going to chance it now, should have thought of that before I made the thread, thanks.

papac

Subway is definately 9/16. Alls well that ends well.:)

blorg

All modern pedals (other than some kids bikes and a small number of BMX) are 9/16. By modern I think that means post war if not earlier, it was a very early standard. Your bike is not that old. The 170 means the cranks are 170mm long.