Wore out three sets of tires already!
Ok, cool. I'll check and see if there's a number on the crank.Yes, the stroke is how long the arms are. Measured from crank centerline to pedal centerline. Most are 6.5" but "modern" one piece cranks sometimes show up as 7" and even little longer. They usually have the length in millimeters cast into the crank between the threads as far as Ive seen. 25mm = 1 inch.
I almost bought a 185mm at the salvage the other day but I really dont need it, just unusual. I like a 7" stroke on my lightweights.