Any tire that is wider than stock that is installed on a stock rim will have a slightly smaller contact patch compared to a stock tire on a stock rim. The wider tire's bead will have to squeeze onto a narrower rim than intended resulting on a profile that's more curved so you lose some contact patch.
Later, Doug
1978 z1000 Streetfighter
1976 z900 Stripfighter
1978 Z1R (roller)
1979 z650 Resto-Mod
1983 Gpz750 Resto-Mod
2018 Z900RS
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