you need to define 'small.' in china, a place with a population of 250,000
is little more than a village. if less than 500,000 don't expect to find a
dedicated bike shop. you want bike stuff? go to the home appliance
dealer. bike 'shops' will carry your basic huffy-quality bikes with little
in the way of parts and accessories.

better check the cities along your route.....nanning, kunming, chengdu
for example. these places will have decent cycling shops where you'll
be able to find piece-parts and lubricants like finish line (wet and dry).