Buy them two inches longer. They should just drag standing up, perfect on the bike and they won't blow up. You do wear boots, right?
+1
I normally wear 34 x 34, but my riding pants are 36 x 36 to keep my pant legs down and allow extra room for my concealed carry. I think they are Wranglers Twenty X, but I never have a problem with them riding up.
Levi 505 or 514. They do not make them the way they used to. The weight of the denim is half. I burn through a new pair in less than two years, and I still have a pair from 10 years ago that are still good.
I ride with whatever pants I'm wearing that day. Some of the lighter weight pants do tend to ride up from the wind. I bought a pair of riding stirrups. The kind with an elastic band with metal clips on the ends. The left clip one scratched my engine case while shifting. I now cover the clips with electrical tape. Riding stirrups are pretty cheap and do work, just watch out for the metal clips.