I got 4 new tires installed and overall I'm satisfied but I detected some steering wheel slight vibration at approximately 40-50 miles ph and it goes away when I speed ...

I got 4 new tires installed and overall I'm satisfied but I detected some steering wheel slight vibration at approximately 40-50 miles ph and it goes away when I speed up or drive at lower speeds. I would say at 45 mph is when I first noticed it. I'm thinking when I get my oil changed I will get the tires rotated and spin balanced again since it's recommended. But can this scenario be expected as just a normal consequence of an older vehicle or should I raise hell at the tire shop? I have no reason to believe there was any incompetence performed by the installer. They spin balance the tires and put the weights on so there really isn't anything I can argue about. I can't prove the tires are defective if they would bring that up as a reason. I feel it's a balancing and weights issue but why would it vibrate at a certain speed if it's been machine balanced. I have no brakes issue or suspension issue. Miles are still low at 64/65k. The tires fit the truck and all. Kunho Crugen p275

Rotating the tires should help you determine if the vibes are coming from the tires or the front-end of the truck. If the vibes move/change, it's the tires.
You might want to have the tires road force balanced instead of just spin.

The back wheel has 2 weights on it, a normal sized and a smaller one.

You paid for mount and balance, if you are not happy take it back and tell them or take them for a ride and show them.
Should not have any vibration from new tires.Let them figure it out and fix it! You paid for it and have the right to be satisfied!

Yah, either the tires are bad or the balance is off. You don't want either. Take it back and have them figure it out. They will probably try to blame worn front end parts, but if it didn't happen before the new tires were put on, then it is clearly the tires or the balance.

I third going back and requesting them to redo it. If you think they were doing a good job and also treated you well, they should have no problem checking them again. And what ever it is, You gave them bunch of money for the tires after all.The sooner you go, the better.

I would go back right now. If the new shake is in the steering wheel, then that means it's one of the new front tires. No sense trying to play around mixing tires.

However, just to be safe, it might be worth checking out the front end components to make sure everything is tight before you go back. And they might try to pass the buck and blame it on front end wear, so you would be ready to reply "I just checked the whole front end, everything is tight".