changing boat tire size/your opinion

[mightyhunter]

Hey everyone, currently the boat trailer uses 4.8/4.00-8 tires. I am thinking of changing them to a larger size, i just dont like these small donuts. any comments are appreciated

[troutperch]

Check the fender clearance I wanted to up size the tires but couldn't due the fender suports would rub the tires.

[PaulR]

Depending on the material the trailer is made from, a good welding shop could always fabricate and attach new fenders. Just make sure you have the clearance between any fenders, the tire, and the boat. One thing about taller tires, it also means deeper water to launch the boat.

[Bushmoose]

As the others have said, be sure you have the proper clearance. But yes, by all means using a larger tire/rim will be easier on the wheel bearings in the long run.

[Pat32rf]

Not just the wheel bearings but they will also roll over the bumps easier with the potential of increasing gas mileage.
If you go to a larger tire they normally have a higher weight rating giving a greater safety margin when loaded at highway speeds. A lot of us carry gear/gas in the boat without being aware of the total weight.
That larger tire may also let you run at a lower air pressure which means the boat will ride smoother over rough roads as well. This can mean tighter rivets a few years/miles down the road....
I always opt for the largest tires I can on any trailer....

[old243]

You can also lengthen the spacer straps on the springs. I did this on a snowmobile trailer. does sit a bit higher. but worked out well. also less tire problems. Old 243

[woody1948]

Don't get too into the idea of carrying more weight. Tire size is generally married to the axle weight.

[patvetzal]

Don't get too into the idea of carrying more weight. Tire size is generally married to the axle weight.

Agreed, but I'll take an extra margin of safety anywhere I can get it. Larger, softer tires also mean less shock load transmitted to the axle.

[scarkner]

Be aware that the launch-depth will increase. if you find that you are right on the edge of being able to launch your boat, then an extra inch or two more height on the trailer may make it much more difficult to launch the boat. Generally trailers with the larger tires have the boat sit between the fenders, but older trailers with very small tires may tuck the tires under the boat.

[patvetzal]

The lakes where I launch can vary in dept depending on the season. Most get gradually deeper as I back farther out....as long as the bottom doesn't get softer as well...