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My wheel shows ETRO 622 * 19. The tire on it is 700*38c. I want to change tire and tube such that the bike becomes capable for 50% road bike and 50% off road. What size of tires and tube should i choose? Also, is it actually possible to do so or not?

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    Tell us more about why are you unhappy with the current tires. Are they too road-y? Too off-road-y? Give us the name of the tires or a picture of the threads. – Vorac May 19 at 10:30
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With a 19 mm wide rim, your wheel will fit tyres from 28-44 mm wide (see Sheldon Brown tyre compatibility). You will also need to check the tyre clearance of your frame if you want to fit a larger tyre than the one you have now.

As for making your bike capable for 50% road and 50% off-road, you may not necessarily want to go with a wider tyre anyway. You will need to tell us what your current tyres are and what is wrong with them for us to help you with that decision.

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I'll first answer your 2nd question.

Also, is it actually possible to do so or not?

With a 19 mm internal rim width, yes it is possible as long as you don't go too wide (like a 50 mm). Also, if your rims have Schrader (car valve) holes and you use Schrader-valve tubes, I suggest you shim your valve hole and use tubes with Presta valves instead to create more clearance in the rim, as forcing Shrader-valve tubes in that rim can strain the valve's base. You don't want to have a puncture right on the foot of your tube's valve.

Now,

What size of tires and tube should i choose?

From a cyclocross/gravel perspective, your tire size is sufficient enough but seeing as you're looking for better tires, I assume that the ones you have are too slick for off-road use.

If you're looking for size range, I suggest having tire width between 35-45 mm. Narrower tires are more aerodynamic and (semi-anecdotal) can be faster-rolling, while wider tires offer better grip.

Get tires with sufficient tread/knobbles. Side knobbles also help in cornering off-road. Refer to my answer in this link for CX/gravel tire tread comparison: Replacement for discontinued Schwalbe Tyrago

Finally, the tube size. While I would recommend you convert to tubeless system if you're using that bike for 50% offroad, it's okay if you use tubes. If you do, I'll share some anecdotal advice: Use inner tubes that are one size/step larger than your tire, and by that I mean width, not diameter.

I find that oversizing inner tubes helps with punctures as the tube doesn't have to stretch as far in order to fill the tire, so the tube wall is 'meatier' and most likely more puncture-resistant. Snakebite/pinch punctures won't help you much though.

  • My favourite mixed use tire is Vittoria 40-622: heavy(immune to punctures) and completely slick(fast on road, ok on mud, gravel, stairs, sand because of the width and sturdiness). – Vorac May 19 at 12:11
  • @Vorac: Which Vittoria? The Voyager Hyper is great as a wide road bike tire but completely unsuitable for wet surfaces (even on wet road it has extremely bad grip, causing me two crashes) and mud or snow. – Michael May 20 at 12:37
  • @Michael exactly Voyager, but don't have much experience with road tires to be honest. Could you please use the Voyager as a baseline and propose better fits for the OP's needs. I am certainly most interested. – Vorac May 20 at 14:45
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    It really depends on OP’s specific requirements and priorities. If “off road” means dry, fine gravel then a slick tire like the Vittoria Voyager Hyper at lower pressures can be totally fine. If it’s more muddy and wet then a Schwalbe Racing Ralph or Smart Sam or Continental Race King can be more appropriate. – Michael May 21 at 7:06

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