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I thought the same when I needed replacement tires. After talking with different shops (non Triumph), all suggested staying with OEM size (not necessarily brand). Reason was that Triumph did all the R&D on the bike and determined the 190 was best suited overall. A few comments also made were if you put a 180 on the rim, it would actually flatten out the tire since the rim, from bead to bead, was wider than a normal rim that holds a 180 (I think S3 rim is 6" wide vs 5.5" for rims running 180). If you flatten the tire, I would think it'd be less responsive. Lastly, if you search around, you can find good prices on tires and there really isn't much, if any, difference in 180 and 190 prices.
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