all depends on cut / wash combination, some runs big and some smaller. If you want tepphar 602 (fit like on diesel online store), go with size 29 for sure. if safado, you can size down to 28, but 29 is your "safe" size.
it's really hard to say, especially you own very old cuts like rabox and kratt :-) both are straight legged and more on the relaxed fit. safado is straight but slim and tepphar is carrot, very slim (if sized wrong -> leggins).