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fietsbob hinted at a key item to consider. 5-spd or 6-spd depends on the frame in most cases. What is the axle length and the inside width between the dropouts on the intended frame? DO widths are 120mm for 5-spd, 126mm for 6-spd, with the axle nominally 11mm longer for each. If the axle is 131mm then the wheel is most likely dished for a 5-spd. You can use it with a 6-spd FW in a wider frame as long as you have a few mm sticking into the DO slots. But you will have to add spacers to the right side to keep the FW from rubbing on the frame and you will probably have to re-dish the wheel. The point being, arbitrarily switching FW width isn't impossible but it isn't just a trivial swap in most cases. Figure out your intended application first.