sounds kind of interesting. let us know how the 16/42 works. I've had the back wheel off before to replace a tire. It's really not that big of a deal to take the back wheel off unless you don't have a lift or haven't made wood stands for your bike. You might even be able to get away without unhooking all the rear brake stuff, but it's just a couple xtra nuts to take off anyway. not a big deal. It is convenient how the sprocket literally falls off the wheel once the axle is taken out. I might consider going to the 15/40 if they make a 40t sprocket that fits the GZ250. That 65-70mph brick wall gets annoying on the freeway.
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