my son as a drr125 with  standard rubber. now i want to put road tyres on for him  
thge front is a 2.75x21 and the back is a 410x18 
i sent him up to the bike shop this morning  and they said avon distanzia were a good tyre. 
are these avons good for wearing as the nobblys he as now dont last long on the rear. 
also  with the avon  front all i can find is 3.00x21 will that tyre fit on  as the one on there now is a 2.75x21 
any info would be great  
thanks