Question: What race in china allows speeds up to 260 km/h on 6.2km of streets?
Sentence (from "Guia Circuit"): However, there are two special features that can rarely be found in other street circuits - variation in altitude (over 30m between highest and lowest point of the circuit) and an ultra long main straight that allows top speed of 260 km/h on F3 cars.
Relevant evidence: Yes