busting pins

[Canadian_Zuk]

if tire size is what is popping roll pins where should i have the largest tires ? I am asking again because i just blew the center axle pins again.

Make them all the same size. Put all your tires at 5psi. Take a fabric tape measure or a length of rope and wrap it around the middle of each tire taking note of the circumference until you identify the smallest diameter tire in your set. Then air down the other tires until they all match it's diameter, a length of rope with a sharpie mark works well for this. As you reach the desired diamter, write on the inside of each rim the required air pressure to get that diameter. Some tires may have 3psi, some may have 5psi, etc but they will all be the same diamter.

[ARGOJIM]

Also how worn are the sprocket pin holes? Excessive wear will slap them against the pins, if just the sprocket holes are wore and not the axle holes, you could relocate them 90 degrees to get into fresh metal. If both are wore you may need to up the pin size slightly.