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

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

Item # YR450BLK-400BLK
Our Price: $35.06
Boat Trailer Parts
Orders above $50 qualify for Free Shipping
Shipping Weight: 1.99 lbs
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Boat Trailer Parts YR450BLK-400BLK - Rollers,Roller Assemblies - Yates Rubber
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Replace your bow roller assembly with this complete kit. Includes a 4" roller, 2 end bells, and corrosion-resistant hardware. Black TPR material is stronger than rubber and softer than polyurethane. 1-833-496-1390 to order Yates Rubber boat trailer parts part number YR450BLK-400BLK 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 - Black. Boat Trailer Parts reviews from real customers.
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  • Reviews (32)
  • Q & A (0)
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Yates Rubber Boat Trailer Parts - YR450BLK-400BLK

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

Replace your bow roller assembly with this complete kit. Includes a 4" roller, 2 end bells, and corrosion-resistant hardware. Black TPR material is stronger than rubber and softer than polyurethane.


  • 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-scratching material
    • Stronger and more durable than traditional rubber
    • Softer and more pliant than polyurethane
    • Black 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.

450 BLK Yates 4" Bow Roller - Black 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

400 BLK Yates 4" Bow Bell - Black Thermal Plastic Rubber

Customer Satisfaction Score:

Customer Reviews

Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Black - YR450BLK-400BLK

Average Customer Rating:  4.5 out of 5 stars   (32 Customer Reviews)

Replace your bow roller assembly with this complete kit. Includes a 4" roller, 2 end bells, and corrosion-resistant hardware. Black TPR material is stronger than rubber and softer than polyurethane.


Great service and fast delivery. I use etrailer for all my trailer needs.


Ordering was easy. Got exactly what I was needing. Order arrived just a few days after purchase. Will definitely use again.


In er wheel was too narrow for my existing needs. I used the outer parts to replace OEM that were hard and deformed.


Just what we needed.

Works as expected. It does not leave marks.
Danny M - 02/18/2022


Part was delivered quickly and is holding up well in the Florida sun.


Good quality for the money and arrived quickly


Great product I’ve had it about a year still in great shape. I use my boat about twice a month in salt water and trailer every time


Although we bought this part as a spare and have not used it, it is exactly what we wanted. George from was excellent and kept us informed on the backorder and shipping of the bow roller. I would buy from him again because of the customer service alone. Thank you so much. Highly recommend!


I am new (again) to boating, and being on the frugal side, always want to compare products that I purchase. Thought I could deal local (you know, support your local economy and all), but when actually given the chance, they could not (or would not) even come close! etrailer sells the same top-quality products at prices that couldn't be touched by local suppliers.
Huge "thank-you" to etrailer for allowing DIY'ers such as myself the opportunity to be a part of this new hobby!


Considering the the original part on my trailer lasted 25 years before needing to be replaced, the wear so far on the replacement part is way more than it should be. The first one was made in the idea where the replace meant came from ...but I bet I could guess


I was extremely happy with it after installation. I purchased it to replace an old one that was marking up my bow with black marks. This one is muck better than that old one, but I still get more faint black marks on the bow . Just wish I went with the more translucent yellowish one that most others have gone with.

I contacted yates and they recommend going with the yellow roller part # YR450Y-400Y
Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Yellow
to avoid black marks. The blue roller part # YR450B-400B
Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Blue
will also work.
-- Etrailer Expert Heather A - 07/31/2018


This product was a great addition to our boat trailer when the OEM part failed. The larger side wings make it much easier to line the boat up on the trailer and help protect the finish on the front of the boat.


Fit great.


This product was of better quality than I expected, I was very pleased with this and every other purchase I’ve made from


Excellent communication and delivery. The product exceeded my expectations! Always good to work with etrailer where you feel they care about you.


Good replacement for my OEM roller assembly that lasted 16 years. Bells and roller seem very sturdy.


Just what I needed.


Good product!


The products are correct come in very fast would use there service again would definitely recommend them thank you


Great quality and fast delivery, perfec t!!


Quality product, fair price, prompt del ivery.



Solid product. Works as intended.


Good product, just what I was looking f or!


Show More Reviews

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

  • Availability of Bow Roller Kit that Includes End Bow Bells
    The Yates Bow Bell # YR400BLK that you referenced comes individually in that part number. For a kit that includes the 4 Inch roller, 2 end bells, and corrosion-resistant hardware, you will want the Yates Bow Roller Assembly with Bells for 4 Inch Wide Bracket # YR450BLK-400BLK. This kit includes the TPR roller and end bells.
    view full answer...
  • Recommended Bow Stop For Boat Trailer With 28 Sail Boat
    Thanks for the picture! I have an option that may work for you, but unfortunately we do not have a bow stop that mounts in the same fashion as the one pictured. What I recommend is using the Bow Roller Assembly w/ Bells for 4" Wide Bracket - TPR - 1/2" Shaft - Black # YR450BLK-400BLK which will need brackets added to the crossmember your current stop is mounted to, but will be a better option as it will not have a bolt through the center which can scratch your boat. I included a video...
    view full answer...
    Image 1 for
  • Bow Roller Recommendation to Fit 4 inch Roller that is Too Long
    Looks like you have the part # YR450BLK-400BLK installed and are needing the next size down which happens to be the part # YR300BLK-325BLK. This fits the same 1/2 inch diameter shaft but is 1 inch shorter than what you have. Your bell ends being deformed would not be a good sign.
    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...
  • Looking for a Replacement Handle for a Knott Autoflex Hand Winch
    If you were looking for a replacement handle, the hole opening on the Replacement Quick Attach Winch Handle for Dutton Lainson Winch - 9-1/2" # DL70330 will measure 15/32" by 5/8" and looks like it will be a good replacement for your Knott Autoflex winch. I do suggest measuring to confirm this though. However, if you are referring to the shaft/handle to change from one speed to the other, you will need to contact Knott directly. This is not a winch we carry so I cannot say if any of our...
    view full answer...
    Image 1 for Image 2 for
  • Aluminum Vertical Bunk Brackets and Stainless Steel U-bolts for Boat Trailer
    The vertical bunk brackets do not have a weight capacity rating. You should be fine with the aluminum, but if you are concerned about the strength then you can stick to the galvanized steel the manufacturer used. - Replacement CE Smith Vertical Bunk Bracket # CE10161A40 (8") - Replacement CE Smith Vertical Bunk Bracket # CE10162A40 (10") - CE Smith U-Bolt - Stainless Steel # CE15503A We do have bunk carpets and bow support options as well, without knowing what size bunk boards and what...
    view full answer...

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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 Alexander C
Updated by:
Alexander C
Employee Jenny M
Updated by:
Jenny M
Employee Aidan B
Video by:
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