Continental grand prix 4000s ii road tyre reflex undisputed market leading race bike tyre the legendary gp4000s tyre has been updated to include a broader range of sizes which now also benefit from the latest cutting edge rubber compounding available in the bicycle tyre industry blackchili this technology is constantly evolving and what better way to introduce our latest version than to update the tyre that launched the compound back in 2007 featuring lower rolling resistance higher mileag