Tire sizes for an 82 GS 550L

[Jedz123]

Hey guys I'm looking into putting some new rubber on the GS550L I picked up and brought back to life. I'm not sure what size to get for it. The front tire is a no name 3.5/19? and the rear is a Metzler 130/90R16. the Metzler looks ok but the no name is old and needs replacement. I would like to run a newer modern tire and would love to know the correct tire sizes for correct replacement. Also perfer a tire that fairs decent on dirt roads for I ride those allot too... Any recommendations on tire brand?
Thanks.

[tkent02]

I'd go with the Road Riders, they are great on pavement and work pretty well on gravel.
If your dirt roads are more dirt, mud, sand or clay than gravel there are some great dual sport tires to think about.
Go with the original size tires for the bike to ride and handle the best, wide tires on skinny wheels suck.
I don't know the size for your model, but someone will.