It really depends on how you "really" use your bike. I bought a Dos for my QB- the 16/19 - but 90% of my riding is my daily commute that I can do in the 40/16 gear with no problem. If you are new to single speeding as I was a couple of months ago when I got my QB you might be surprised what gear you can actually get away with. There's a small hill on my commute that I never would have thought I could handle in 40/16, but in fact it's no problem at all. I might suggest trying a few cheap single freewheels to see what gear works for you before spending on a WI. Shimanos are cheap and there are some BMX units out there even cheaper. (apologies if you are a veteran SS-er. I'm just learning this stuff!) BTW, I was able to make all 4 ratios on my 16-19 rear X 40-32 front work within the dropout range, though the 32x16 (not that you'd ever use that) was right on the ragged edge. But not with fenders of course!
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