That's about what I was guessing. If you ever DO hop on something that weighs more like 30 pounds, you're going to feel like you've got a rocket strapped to your butt. When we did that eastern Oregon ghost town bike tour, I borrowed one of their fleet of loaners, a Fuji Absolute. It's a flat bar road bike with relaxed geometry, aluminum frame, discs, 700c x 32 tires, nothing fancy, can be had from $450 to $950 new depending on specs. It was so, so much lighter than my normal bike that I blitzed through 60 hilly miles a day without any soreness. You're doing yourself a world of good on the fatbike - you're doing it the hard way, you've got nowhere to go but "lighter." It's actualy an awesome, rare choice. Most guys get scared and throw their wallets at the lightest thing a salesman can cram into their BMWs when they first start out. The first time you go out on something light, you're going to be unable to stop grinning, because you will be so overly prepared.