Ack! Sorry, I unintentionally misled you. The two sizes that will generally cover things are 3/8" and 1/2". With a 3/8" one only, I don't think you'll be able to torque the axle nuts, sprocket nuts, etc. But, there are small 3/8" ones that do get down into the inch-pounds and can certainly be used for oil drain plug and similar fasteners. So, IMO, get the 1/4 and 1/2, or 3/8 and 1/2, but not just the 1/4 and 3/8.
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