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Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Blue

Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Blue

Item # YR450B-400B
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Our Price: $19.94
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Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Blue Rollers,Roller Assemblies YR450B-400B
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Replace your bow roller assembly with this complete kit. Includes a 4" roller, 2 end bells, and corrosion-resistant hardware. Blue TPR material is stronger than rubber and softer than polyurethane, and it won't leave marks on your boat. Call 800-298-1624 to order Yates Rubber boat trailer parts part number YR450B-400B or order online at etrailer.com. Free expert support on all Yates Rubber products. Guaranteed Lowest Price and Fastest Shipping for Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Blue. Boat Trailer Parts reviews from real customers.
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  • Reviews (43)
  • Q & A (3)
  • Videos (1)
  • Photos
  • Why etrailer?

Yates Rubber Boat Trailer Parts - YR450B-400B

  • Roller and Bunk Parts
  • Rollers
  • Roller Assemblies
  • Bow Roller Assembly
  • Thermoplastic - Non-Marking
  • Yates Rubber

Replace your bow roller assembly with this complete kit. Includes a 4" roller, 2 end bells, and corrosion-resistant hardware. Blue TPR material is stronger than rubber and softer than polyurethane, and it won't leave marks on your boat.


  • Bow roller assembly replaces the bow roller, end bells, shaft, and hardware on your boat trailer
    • Eases loading and unloading of boat
    • Supports front of boat as it sits on trailer
    • Helps to absorb road shock while boat is being towed
  • End bells ensure that your boat does not scrape along bolts or roller bracket
  • Thermal-plasticized rubber (TPR) construction
    • Non-marking, non-scratching material
    • Stronger and more durable than traditional rubber
    • Softer and more pliant than polyurethane
    • Blue color
  • Zinc shaft and hardware with yellow zinc finishes are corrosion-resistant
  • Made in the USA


  • Application: 4" wide bracket
  • Shaft dimension: 6" long (not including bolt head) x 1/2" diameter
  • Roller dimensions: 3-3/4" long x 3-1/4" diameter
  • End bell diameter:
    • At widest point: 5-1/4"
    • At attachment point: 3-1/2"
  • Locknut diameter: 1/2"
  • Washer diameter: 7/16"

This complete bow roller assembly includes 1 roller with 2 matching end bells, plus the hardware you need to mount them on your trailer. Simply attach the assembly to the existing bracket on your boat trailer and you're all set! The TPR construction provides ultimate durability and strength over standard rubber rollers and will not leave marks on your boat.

450 B Yates 4" Bow Roller - Blue Thermal Plastic Rubber

400 B Yates 4" Bow Bell - Blue Thermal Plastic Rubber

11098ZY CE Smith Heavy Duty Hex Screw - 6" Long x 1/2" Diameter - Zinc

10961ZY CE Smith Flat Washer - 7/16" Inner Diameter - Zinc

10812ZY CE Smith Nylon Locknut - 1/2" Diameter - Zinc

Video of Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Blue

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Yates Rubber Boat Trailer Parts - Roller and Bunk Parts - YR450B-400B Review

Today we are going to be taking a look at a Bow Roller Assembly, this bow roller assembly replaces the bow roller, end bells, shaft and hardware on your boat trailer. It eases loading and unloading of your boat, and it's going to support the front of the boat as it sits on your trailer. It's also going to help absorb road shock while the boat is being towed. The end bell's, which are these components right here, these insure that the boat does not scrape along bolts or roller brackets. The roller bracket would sit right here at the edge of the roller on each side, it would detach using that center shaft or center bolt. The material is a thermal plasticized rubber construction that's TPR. It's a non-marking, non-scratching material, it's stronger and more durable then traditional rubber, and it's softer and more pliant then polyurethane.

This is blue in color all the hardware is a nice sturdy construction that's going to be a zinc shaft, and hardware with yellow zinc finishes, highly corrosion resistant, great for water applications. The products are made in the USA. This is designed to work a 4 inch wide bracket, again it would sit in these grooves here, and attach using that center shaft. The shaft dimensions, so the dimensions of that bolt from the bottom of the bolt head to the end of the threaded portion, that's going to measure about 6 inches long, and it's going to have a 1/2 inch diameter. When it comes to the dimensions of the roller, that's just this center piece here, it's going to be hard to tell but that's going to be 3 3/4 inches long and the diameter at the widest point is about 3 1/4 of an inch. The end bells, when it comes to the diameter of those at the widest point here on the edge, that's going to be about 5 1/4 of an inch.

The diameter at the attachment point, which would be right here edge to edge, is going to be about 3 1/2 inches. It's a complete assembly, again it's going to come with, the roller, two end bells, and it's going to come with the appropriate hardware. You are going to get that center shaft or bolt, you're going to get a flat washer, you are also going to get another flat washer, and then a nylon lock nut. That's going to do it for today's look at the Bow Roller Assembly.

Customer Reviews

Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Blue - YR450B-400B

Average Customer Rating:  4.8 out of 5 stars   (43 Customer Reviews)

Replace your bow roller assembly with this complete kit. Includes a 4" roller, 2 end bells, and corrosion-resistant hardware. Blue TPR material is stronger than rubber and softer than polyurethane, and it won't leave marks on your boat.

- YR450B-400B

It replaced an old brittle roller. This is a good one and I’m pretty sure it saved my boat in a terrible wind storm while towing. I was hit with a huge gust well over 50 mph. It lifted and shifted the boat out of the cradle and the keel was hanging between the roller and the outer bells. It was playable but strong and supported the boat for over an hour while the wind was gusting and my wife went to get a big 4x4 to help me leverage it back in place. This is a heavy welded aluminum Kingfisher 25 ft boat so it was no small task! Thanks etrailer for a great product!

- YR450B-400B

So far so good. Love how it's heavy dut y.

- YR450B-400B

The product worked as intended the reason why I didn't get five stars was because packaging was very lacking. The box arrived halfway open with no packing material inside the box to keep the product protected.

- YR450B-400B

Have not used product yet, ordered two 4” rollers and ears. Received one 4” and one 3”. Sara in customer service was able to resolve issue. Thank you.

excellent, would order again
Jeff S - 06/21/2021

- YR450B-400B

Fast delivery, and seems like the perfect replacement, and the blue matches my trailer

- YR450B-400B

fast delivery, great product, excellent customer service!

- YR450B-400B

Folks, I decided to completely revitalize/upgrade my 20 year old bass boat trailer and found that not only could i find all the updated parts i needed, (led lights and urethane bow rollers, etc), at one location, additionally itrailer.com has a video for just about each part, where they share different measurements etc that may not be on the standard part description. These videos provided me with all the information i needed while configuring my retrofit. Additionally, when I placed my order, I received a personal email from the guy who packed my shipment., confirming that all the parts i ordered where in stock and now on the way. I typically never write these type of endorsements, but I felt compelled to write this one. Great service and all the parts I purchased have met my expectations. I'll be back when I need additional trailer parts.

- YR450B-400B

Great product and even better customer service

- YR450B-400B

I am very pleased with the product, although I have not yet installed it. I'm sure it will fit my trailer since it is the same brand, size and profile as the black rubber roller it will replace. The two outside "bell" rollers are actually larger than the originals which is a plus and this material will not leave marks on the hull like black rubber.

- YR450B-400B

Little smaller than the ad said had to bend mounts to fit . bought 12 inch to fit the 12 inch mount they were a inch to short

- YR450B-400B

I ordered this bow roller to replace an old one on my trailer. Everything when recieved was as stated in description and fit perfectly.

- YR450B-400B

This roller went on easy and fit perfectly.the larger bells help iñ loading when it's a bit windy out. The blue color looks good with the boat and doesn't mar. Thanks

- YR450B-400B

Hard to find this particular replacement part except on etrailer. Is an exact replacement.

- YR450B-400B

Easy to install and seems more durable than the original part that it replaced.

- YR450B-400B

Excellent product. Holding up nice to the sun. If I had a complaint - it might be a bit too soft. The bow eye on the boat has taken a few big chunks out of it. All good though

- YR450B-400B

I probably should have ordered a 5" assembly made it work with spacers and a longer bolt

- YR450B-400B

The bow stop is exactly what I needed.

- YR450B-400B

exactly what I was looking for. color matches my trailer. service and delivery was quick

- YR450B-400B

Quick service and shipment

- YR450B-400B

this is a great addition to my boat trailer referbish

- YR450B-400B

Purchased this product because my black roller was marking by boat. Issue resolved. Great product.

- YR450B-400B

A great product. Works perfectly.

- YR450B-400B

It replaced the old one that was worn out. So I am happy. thanks

- YR450B-400B

Great quality and shipped quick!!

- YR450B-400B

Excellent product. Great quality and price was right

Show More Reviews

Ask the Experts about this Yates Rubber Boat Trailer Parts

  • Replacement Bow Roller with Bell Ends for a 2011 Skeeter SX200 Boat Trailer
    It would appear from the photo you attached that the distance between your mounting bracket is 4" wide which means the correct blue roller assembly for you is the Bow Roller Assembly w/ Bells for 4" Wide Bracket part # YR450B-400B. This assembly will be a nice upgrade for your trailer as the thermal-plasticized rubber will help to absorb shock without marking the boat up and the included bell ends will ensure there is no contact with the mounting bracket. I have attached a review video...
    view full answer...
    Image 1 for
  • How to Prevent Metal Bow Roller Brackets from Contacting the Boat
    Almost all bow roller assemblies have an industry standard hardness of 85a durometers. I was able to call my contact at Yates to confirm this. I do have a solution for you but we do not have any bow rollers with a hardness rating greater than 85a durometers at this time. However, I believe the problem you are experiencing can be eliminated using a wider roller as this would in turn dissipate the weight more evenly to minimize contact with the metal brackets. I recommend using the Bow...
    view full answer...
  • Replacement Bow Roller for 5/8 inch Shaft
    I have a few different options for you. The Rubber Endcap # YR134-5 that you mentioned can be used with keel rollers, spool rollers, or bow rollers. If you are wanting to stick with a bow roller, We do have a Bow Roller Assembly # YR450B-400B available that comes with a 1/2 inch shaft. This will eliminate the need to find a bow roller with a bigger shaft hole. I did go out to the warehouse to see with it was possibly that a 5/8 inch shank could fit in a bow roller that has a 1/2 inch...
    view full answer...
    Image 1 for

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Cole B
Installed by:
Cole B
Employee Chelsea B
Written by:
Chelsea B
Employee Jenny M
Updated by:
Jenny M

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