So I just bought a specialized source for commuting but want to do some longish tours and was wondering if this bike would do or if I need to get a different bike or what upgrades etc. I was thinking may e putting some knobby tires like on a hybrid and upgraded rack but is there anything else I'm missing?

Is there a reason that you would need knobby tires? For touring I would get some wide tires (32-35 mm) with a light tread. You may want to add a front rack for longish tours.

Thought that might help with grassier/ dirt road terrain. Yea I'm getting front racks for sure if I can't fit everything I need in /backpack back rack

Can we assume the Source Elite ?.

If you plan to ride dirt roads,then a semi-knobby cyclo-cross tire is useful. Something with a smooth center/top, knobby side tire is my preference as they roll pretty well on pavement when needed, with knobs that help in turning on dirt and gravel. I'm currently in love with my Michelin Trans-World Sprint tires, but only have short term usage, so no real recommendation, though others might. I'm also happy with 35mm slicks on gravel, but that's me.

The bike otherwise seems appropriate for intended use. If I were taking it on a multi-day with front and rear loads, I'd A) keep the load to a minimum and B) Get the wheels stressed and trued by a quality wheel person. 32 spokes is (IMO) on the light side for a loaded tourer and that seems the obvious week point - factory wheels. Note as well that I'm a heavy rider and kill wheels. If you weigh 140, then maybe will be OK as is.

SB

Should work just fine - Which specific model did you buy? I agree with upgrading the rear rack. (I understand the capacity rating of the rack it is spec'd with is 22 lbs?) I also agree with adding a front rack to balance out the load. After you've ridden it awhile, you may decide to change some other things for comfort reasons or otherwise.

It looks like a sweet ride! Congratulations and have fun with it!

i like these kenda k-935 semi-slick tires for all-round use. i use 'em on my hybrid/mtb in 26x1.75.
when on tour with rear panniers, switch to 26x1.95 on the rear. i weigh 185, carry 20-25 pounds of
stuff. tire is rated 40-65 psi, i usually run at 50 psi.

they gots a smooth center bead for paved roads, and some knobblies on the shoulders for
off-road. good on gravel/dirt roads, and light sand. not so good in deep sand or dust.
they also come in 700x35 and 700x38 and 700x45.

i can get 5-10,000 km on a tire, depending on usage. not bad for a $5 tire. (online in china)

I think the spec was 25 kilograms, or about 55 lbs.

The OEM rack looks like it was intended somewhat as a sales gimmick, rather than an actual functioning rack. I'd replace it with even a cheap Al std rack.

I'd add bar-ends too, for more hand positions.

It's actually only like 20lbs I haven't tried to put anything on it was just going to swap for my old rack. It came stock with bar ends so I'm good on that part. Might still put some aero bars