Welcome to the Beijing Rider community.
You will know what your bike is capable of on good road after doing a loop

BJ -> S213 to Sihai -> east on S323 to LiuLiMiao -> few km south onto G111 -> east on S310 to MiYun -> south to JinCheng expressway and back to BJ.

ca. 300km with 200km mountain curves at least :-)

If you look for other riding companions drop me a PM.