that number is only the tread section width... it has nothing to do with alignment. Depending on the backspacing of the rim there may be a little change in scrub radius but that's not an issue. Generally your choice of rim and tire, as long as they're otherwise properly fitting for the vehicle, have almost nothing to do with your ability to get it properly aligned. Pre-existing uneven wear will show up in a pull or wander after an alignment though and people often blame their alignment or the suspension in general for the problem when a tire pressure change would fix it. For that reason I try to do my alignment just after putting tires on the car.
Excessive tire wear and possibly shabby handling will be your only real indications that you need CC plates in all reality if you're not a racer or a wrench.
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