The TSC 55 K is such a nice saw I'd just stay with the thinner blades it was designed to use. The thicker blades can be used because the riving knife was eliminated but battery runtime will go down, and if you use the dustbag, the bag will have to be emptied more often.
Also, some of the 2.2 kerf blades have the same amount of carbide overhang as the 1.8 kerf blades while other blades do not. This leads to splinter guards being cut to a different dimension.
Here's a 12 tooth rip blade in 1.8 kerf & 2.2 kerf versions. The plate thickness and the carbide insert thickness are different but the distance the carbide overhangs the plate is the same on both blades, .61 mm.
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Here's a 52 tooth alum/plastic blade in 1.8 kerf & 2.2 kerf versions. The plate thickness and carbide thickness are different but the carbide overhang is different on both blades, .66 mm vs .43 mm.
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Finally, here's a Festool comparison between the TSC 2.2 kerf vs the TSC 1.8 kerf.
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