The S is the Black Chili compound. I think for really nitpick cyclists these matters.
I've had some of my friends ride on really cheap $19 tires, and it lasted over 5k miles for them, while for others it lasts 1k. OTOH - I've had cyclist friends that have $60 tires (per tire...that's $120 total), and they get flat after flat after flat...
Tubes are expensive....and if you have a gash. you have to buy a brand new tubes tires. They have no inner tubes, clinchers do. Don't even bother with them unless if you're a serious cyclist/racer.




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