nope, because you're still raising the final gear ratio. Basically, upping the rear sprocket size and lowering the front sprocket do the same thing, and going down 1 in the front is about like going up 2-1/-2 in the rear. The more you raise the ratio the more the speedo is going to be off, because whichever sprocket you change, the engine is still going to be at a higher rpm for any given road speed.
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