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  1. Boat Trailer Parts
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  5. 3-1/4 Inch Diameter
  6. 3-3/4 Inch Long
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
Our Price: $37.62
Boat Trailer Parts
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Shipping Weight: 1.86 lbs
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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. 1-800-940-8924 to order Yates Rubber boat trailer parts part number YR450B-400B or order online at Free expert support on all Yates Rubber products. Great prices 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.
  • All Info
  • Reviews (66)
  • Q & A (0)
  • Videos (2)
  • Photos

Yates Rubber Boat Trailer Parts - YR450B-400B

  • Rollers
  • Bow Roller
  • 3-1/4 Inch Diameter
  • 3-3/4 Inch Long
  • 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 Bow Roller Assembly with Bells Review

What's up everybody It's AJ with Today, we're gonna be checking out the Yates bow roller with bells. And what that means is, there's gonna be a roller here in the center, and you get these bells on the side for complete protection when you're loading up your boat. Let's check it out. Now, looking at it a little bit closer, you can see the bells here and how much they extend out there. This covers up the bolt section here, 'cause it's a long bolt that goes through here.

So it's added protection from that bolt and from the center section of the trailer here. That way when this boat gets pulled up on here, even if it's coming in a little hot, it's gonna hit that roller, it's not gonna hit the trailer roller, it's gonna be protected on the sides. All of this is gonna be made out of a thermal plasticized rubber. So that means it's gonna be protected. When the boat hits it, it's not gonna leave any scuff marks on there, and it's gonna be able to absorb road shock.

So if this is pulled tightly against this when you're pulling it on your trailer, and it is rubbing on here or bouncing over here, it is made to accept that shock, so it's not gonna damage this, or the boat. Now, let's look at some measurements and make sure it's gonna be right for you and your trailer. So, this roller part here is gonna be 3-3/4 of an inch. And so, that's gonna be fitting in between here, so that part's important to look on your trailer to make sure the roller is gonna fit in there, and still be able to roll. And then the side here, is gonna be 1/2-inch diameter hole, and that's where the hardware goes through.

Now, if you're looking at it and saying this doesn't match your trailer, it does come in two different colors too. You can get in blue or black in the full setup, so check those out on our website. It's also really easy to get installed. Check out how we did it. Now, we went ahead and removed the old one.

So, this is where we're gonna put the new one. So, I'm gonna set the roller part in the center. Ready to go. So we're gonna put the bell part on the bolt, so it's gonna come like this. Originally, you can just run that bolt through that end here all the way to the bolt head, because what we're gonna do, is line this up and just slide it on through. So we got the bell on this side. We're gonna add the bell to the other side. And then we're gonna add our washer and nut. Slide that on there, and then hand tighten this for now, and I'll go get my tools and fully tighten it down. Connect my ratchet and wrench and just start tighten down. Overall, it's that easy to get installed. And I think it's gonna be a good addition to your trailer, especially if you're replacing an old one that's all messed up, or maybe you just have the center roller and you're adding this one that has the bells on the side. It's gonna give you overall more protection when you load up your boat, keep it from getting scratched up when it goes to rolls against the roller. Well, I think that does it. Thanks for hanging out. And I hope this helps..

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.6 out of 5 stars   (66 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.


For my trailer I unloaded my boat and when I loaded it back up after fishing the boat got a little off and the roller is very soft. I smooshed the outer rubber part and it deformed. It also scratched my boat cause the rubber smooshed exposing bracket. 32’ contender


This bow roller is exactly what I needed. It is exactly as described. My existing roller was leaving black marks on my boat and this new roller because of the material used is mar proof. I enjoy working with etrailer. I have bought my towing hitches and balls from them and am very satisfied all around. Thanks etrailer for being there when needed.



The boat roller I purchased a year ago from etrailer is perfect. It does not leave marks on the boat bow and catches the boat easily. Very, very happy with it.


My original bow roller was 20 years old when I swapped it out. It was in perfect condition, but i wanted to color match the trailer and boat with blue rather than the yellow rollers that came from the factory.

The new rollers already have gouges and deep dings in them from less than a years use and maybe 10 launches and haul outs. The material is just NOT of the same quality as the rollers I removed, and I suspect I'll need to swap them out in a year or two.

My boat is heavy, a 25' Cobalt weighing in at approx 4600 lbs, and perhaps these rollers would be fine for smaller, lighter tin boats, but if you are thinking these will work for your larger watercraft i'd rethink your choice of roller.


Two star given because in my opinion boat trailer parts should have stainless hardware.This unit arrived with standard hardware so I reused my old stainless stuff. Bow rollers look like good parts.


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


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!



The bow roller continues to perform well. There was a very slight amount of damage just to the surface of the roller in one spot by the previously described event but it hasn’t been a problem.


It actually rolls unlike the stock Shorelander piece. I recommend putting a water resistant high quality grease on the bolt


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


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 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.


Haven't installed yet but seems like quality product.


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


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.


First, this roller assembly matches the color of our boat and trailer, second, it shipped super fast, third, it was EASY to install, it even came with a new nut, bolt and washers which I didn't realize.


Ordering this product was easy. I was able to match it perfectly based on the picture provided on the website. Wealth got it in a timely manner.


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.


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


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


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


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


this is a great addition to my boat trailer referbish


The bow stop is exactly what I needed.


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


Works but seem to scar up easily


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


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

Show More Reviews

See what our Experts say about this Yates Rubber Boat Trailer Parts

  • Bow Rollers With Bell Ends For a 3-3/4" Inside Width Mounting Bracket
    The Yates Bow Bell # YR400Y I see you were looking at the 5-1/4" diameter is the outermost diameter of the roller. This particular part is designed to fit on the outside of the bow roller bracket. Here is a list of the bow roller assemblies we have with bell ends that will fit a 3-3/4" inside width 4" outer width mounting bracket. Black TPR # YR450BLK-400BLK Blue TPR # YR450B-400B Yellow TPR # YR450Y-400Y
    view full answer...
  • 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 hole...
    view full answer...
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  • 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

Do you have a question about this Boat Trailer Part?

Info for this part was:

Employee Andrew K
Installed by:
Andrew K
Employee Cole B
Installed by:
Cole B
Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Chelsea B
Written by:
Chelsea B
Employee Jenny M
Updated by:
Jenny M
Employee Aidan B
Video by:
Aidan B

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