Boat Trailer Bow Rollers

A bow roller is the roller at the front of a boat trailer, often called the front roller. It is the first part of the trailer the boat's bow touches when you load, and it supports and centers the front of the hull while you tow.

"Bow roller" is a general term. There are four bow roller shapes, and each one is made to match a different bow shape: slotted V, deep V, semi V and flat. The right roller matches the shape of your boat's bow, also called the stem, so the hull sits in the roller instead of riding on its edges.

How to choose the right bow roller

Look at the front of your boat at the bow and the stem (the edge that runs down the center of the bow). Its shape tells you which roller fits.

Slotted V: Most aluminum boats have a wide ridge running down the bow stem. The slot in the center of a slotted V roller gives that ridge a place to sit, so the boat stays centered.

Deep V: A fiberglass boat with a sharp, deep V bow needs a roller with a deep V shape to support both sides of the hull.

Semi V: If your bow has only a slight V or a gentle curve, a semi V roller matches that shallower angle.

Flat: If the front of your bow is flat across, with no point or angle, use a flat roller.

How to choose end caps: flat, medium bell or large bell

End caps mount on the outside of the roller bracket, one on each side, on the same bolt as the center roller. Which ones you need depends on the shape of your bow.

The most important rule: the boat should rest on the center roller, not the end caps. If the hull presses hard enough on the end caps to bend or curve them, they are the wrong style for your boat. Step down to a smaller cap, from large bell to medium bell or from medium bell to flat.

Boat hulls vary a lot. Some are flat in the center and then turn into a deep V. That is why we offer our slotted V, deep V and semi V rollers with your choice of flat, medium bell or large bell end caps, so you can match your exact hull. Flat rollers come with flat end caps only.

How to measure for the right size

Measure the inside width of your trailer's roller bracket, the space between the two sides where the roller sits. Measure the inside, not the outside. The outside measurement includes the thickness of the metal, and the roller will not fit.

Your inside measurement is the roller size you order. Each roller is made to fit inside the bracket with room to spin freely.

All of our bow rollers use a 1/2″ bolt. Kits include the stainless steel bolt, washers and lock nut.

Bow roller FAQ

Is a bow roller the same as a front roller?
Yes. Both names refer to the roller at the front of the trailer that the bow of the boat rests on.

Which bow roller do I need for an aluminum boat?
Most aluminum boats have a wide ridge down the bow stem, which fits a slotted V bow roller.

Which bow roller do I need for a fiberglass deep V boat?
A fiberglass boat with a sharp, deep V bow needs a deep V bow roller, usually with large bell end caps.

How do I measure for a replacement bow roller?
Measure the inside width of your roller bracket, not the outside. That measurement is the roller size you order.

Where do the end caps go?
End caps mount on the outside of the bracket, one on each side, on the same 1/2″ bolt as the center roller.

How do I know if my end caps are too big?
The boat should rest on the center roller. If the hull is bending or curving the end caps, choose a smaller cap style.