My retract choice is the Spring Air 301 Firewall Retract Set. These retracts use air pressure to go up and spring force to go down. I have successfully used these in the past on my Byron A-4 Skyhawk and feel they offer a good quality value with a great fail-safe mode of operation. If you loose the air pressure, the retracts lock down in the landing position. Carl Rich also proved that these retracts were a good size choice on the Version 1 Cessna. The 301 retracts can handle models up to 15-16lbs.

Instead of using the supplied wire mains, I'm using a pre-enjoyed set of Robart 501 struts with Dubro (275TL) 2-3/4" Treaded Lightweight Wheels. Any strut can be easily added by making your own 5/32" pin with a Dremel tool. The struts not only reduce bounce on landing but enhance the gear appearance by eliminating the skinny wire look.