Hi, Just to let ya'll Know i'm new, how are you all.

This is my problem,

- I Bought my second hand cuore from Simpson Salvage, york (uk) but with me buying it from there i did not get a user manual or anything with it, What i need to know, if anyone can help me, is, i'm not sure if what size tyres/wheels are i think there the stardard size which you get fitted 12"/13" their tiny and thin, just i was wondering if i can fit a bigger size on and which size they can fit i'm after a wider/bigger set. also do you know what my tyre pressure is for the orignal tyres? thank you for your help x