Don't use shear pins because you'll shear the pins. We used to use those but have graduated to keyed shaft. We used 3/4" keyway shaft for our axles turned down on the ends to fit in 1/2" bearings. Can you spell BEEFY. 
Keyway shaft, shaft collars, keyed sprockets/wheel hubs, and keys. Stick with these and you'll have no problems (other than empty pockets. That keyway shaft is kinda pricey)
Check out McMaster Carr.
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Teacher/Engineer/Machinist - Team 696 Circuit Breakers, 2011 - Present
Mentor/Engineer/Machinist, Team 968 RAWC, 2007-2010
Technical Mentor, Team 696 Circuit Breakers, 2005-2007
Student Mechanical Leader and Driver, Team 696 Circuit Breakers, 2002-2004
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