Well I finally decided on a set of Dirt Devils for my Rubi, now I need some advice for the size. I was set on buying 26" because I don't want any rubbing and want to keep as much stock as possible. But after reading some things here I found that a 26" tire can actually be 25.5" or 27" so If anyone has Dirt Devils and knows if these tires run Big, Small, or True to size can you please let me know asap. I want to get actual 26" out of this. Thanks.