So I have had my fixed gear for almost two years now and have about 2500 miles on it, mostly commuting but some training as well. Today I was trying to take the rear cog off because I wanted to swap over to 1/8 inch chain, cog, and crank, but could not for the life of me get the cog off. The shop where I work broke a chain tool trying to get it off, and then I took it outside to try skidding it off. Did about 10 minutes of trying to do that but to no avail. Is there any way to get it off? If not, what is a decent wheel to start looking at. Preferably prebuilts. The ones that are on it now are just the stock open sport laced to no name hubs 3x, and have held up fine. Not trying to get something super light, durability is much more important (these one have not been trued since I've had them, and are still perfect).