RE: Extreme Flight 87" Yak 54 - Build & Fly
Use Kavan wheels. These are the lightest option out there and they are very nice quality. You can get them from Trybuiltmodels.com. The plastic hub wheels come in 3.5 and 4 inch and are only $10.95. The ones with the crome hubs are even better with inflatable tires, but these are more expensive and the smallest size is 4 inch. I own and use a set of both wheel types. The 3.5 inch plastic ones have a firm plastic tire and only weight 3oz for the pair! I wish you could get the chrome hub version in the smaller 3.5 size. Tires that you can adjust the pressure in are very nice. My 2.6 Extra has those.