From Edmund's Inside Line:
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SynchroRev Match is all zeros and ones--there is no black box or additional hardware. The 370Z's engine controller simply compares the engine speed to the data being fed by the rear wheel speed sensors. Since it "sees" the gear lever position and "knows" all of the gear ratios in the transmission, simple math dictates what the engine speed needs to be when you go for, say third gear at 60 mph.
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Since the Synchro-Rev-Matching is performed by comparing engine speed to rear wheel speed, wouldn't altering the rear tire size (and therefore the gear ratios) reduce the system's accuracy?
I've never seen this mentioned, so maybe the effect is negligible (+/- 5%) or the system is able to trim out changes in gear ratio. You'd think Nissan would have designed the system that way, since the gear ratio changes slightly as the tires wear. Have you guys ever noticed imperfect rev-matches with new tires?