Now since these tires I found are technically a size up, there will be differences in reporting speed from the stock 18s. With the stock 18s, I already have about 4 mph "offset" from the reported speedometer speed vs actual. This has always been annoying, but in the case of sizing up on the 19s, I would now be more close to the reported speed--which is convenient. Albeit it is only 1 mph max @ 70mph, this is actually fairly reasonable!

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2003 BMW X5 3.0i -- MT5, 3.64s final gears, H&R lowering springs, K-Mac bushing kit
2007 BMW X3 3.0Si -- MT6