Originally Posted by
T-Mar
Here's the specification sheet from a Bike World Magazine road test of a 1972 Raleigh Pro. It includes partial geometry measurements.
Given the date, my guess is this isn't a Mark IV. Plus, it looks like Raleigh reports front-end geo the same way they did in the adverts for my 1952 Rudge (were the Professionals built at Nottingham?). The way I read the front end specs: Wheel radius is 333mm, assuming skinny tubulars. Fork offset is 2 ⅜ inches, or 60.3 mm, and angle is 73 degrees. So trail by the standard formula or online calculators is 38.75 mm. This is close to the value on my 1952 Rudge, surprisingly! Its wheelbase is more in the range of 43 inches, maybe more.