[OXO cube]

hi Leo
hope your good 

I'm not 100% 
I think Quick slicks do a tyre for the Scalextric start F1 cars 
which if i am not mistaken is the same size wheel as your 1275 mini

Scalextric START F1 part no- SC130
might be worth dropping 'slot car corner' a message to be sure 

no idea who , if anyone stocks them in UK or EU 
and shipping is pricy from US unless your buying a few 

hope that helps m8 

Kev