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Like Bill says for tire width/weight, but it’d have to be pretty significant to account for .4 secs 0-100. You’re less than an inch wider.
Are you working from GPS or your speedo for your timing? If you changed your tire diameter your speedo might be off, no?
So maybe a combo of the two effects (width + speedo error).
Also, I hope your new tires have ~equal diameters, since you’re XDrive. If the car senses they’re not, maybe it’s possible that could cause some traction fault/delay (?)
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