u/Heavy_Information_57

Hey there. Was wondering if someone could help me figure out what tires to get for my nephews bike. 2 years ago he got a little SSR 110 dirt bike as his first bike. Being skeptical of the chinese bikes we have been surprised by its durability. However he needs tires and I am having a hard time finding a front tire of the same size. The back tire is 2.5-10 which i can find. But the front tire is 2.75-12 and I cant seem to find it anywhere for some reason. Can I do a bigger tire on the same wheel on front and back or do I have to buy an entirely separate set of wheels to change the tire size? Thanks for any help.