I made the mistake of ordering the wrong front tire size for my XR650R. I ordered a 90/100-21 instead of 80/100-21 as I've read in this forums. They were on sale for $29.99. I trail ride in medium to hard terrain. I just don't know if I should return it & get the 80/100 one (hoping they have it at the same price) or keep it. Can anyone instruct me on this?. Thanks in advance.