hey guys i have a huffy mountain bike 5 speed and i wanted to know if i can make it a 6 or 7 speed please help

yes

great do i have to change my tire size too or no cuz some one told me if i do a 6-7 speed i have to change my tire size

You don't have to change the tire size, but you may need to respace the dropouts and probably buy a new (longer) rear axle. Can you tell us anything more about the bike?

Measure .... what is the dropout spacing?

if there is cold setting in the plan spread it out to 135..

wider allows the whole hub to move to the right, putting the hub a bit more centered under the rim on the center line.

then get a longer axle.. solid , nut fixed ..as you say .. so I wouldn't pour much money into the project ..

road bikes were 126 when 6 speed hubs were in vogue. 135 is more like what MTB are now..

What else do you need to know?

If you've got a friction shifter, and you probably do, yes you can change it to a six speed but changing the number of gears is not the end of it. You'll need to change the freewheel. The six speed freewheel will be wider than your five speed. With a little luck the change will will allow the rear wheel to fit back in between the drops on your bike. However, it's possible if the clearance is tight, that it won't fit. You can try seven speed, but the concern I previously mentioned may be more pronounced. Because you probably have friction shifting, your shifter will work but you will have to completely reset the rear derailer to handle the new, wider freewheel.

Save your money and buy a better bike. Embarking on a path to get two more gears on ANY huffy is throwing good money at bad.

I agree that it doesn't pay to sink money into your Huffy however I can tell you that I put a wheel with a 7 speed freewheel onto my wife's formerly 5 speed Huffy. It shifts to all 7 gears (friction) using the 5 speed chain. I really had to reef on the drop outs to get the wheel to fit.

I actually only did it because her old wheel had a sidewall tear with tube sticking through and we wanted to go for a ride so I grabbed the wheels off of a mostly stripped out bike I had laying around.

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You can buy one of those front sprocket sets that havetwo: one around 52 teeth and the other that has about 39 teeth (frommemory?). I have an old Huffy that started life as a six speed (or maybe7). I brought the sprocket set at the swap meet and put a five speedcassette on the back wheel. I had to add a few links to the old chain butwith friction shifters it works fine. If you could find the sprocket set,you can have a ten speed. Out of ignorance, I kept the front derailleurand it works fine

It would be way more $$$ and trouble than it is worth. Spend that cash instead on a better bike with more gears.

Sorry to say, but, this is the hard truth about your bike. There are limits to reasonable upgrades to any bike including your Huffy.