Ronstan Series 55 BB Orbit Block, Double Becket SwivelRF55210 - RF55210

Ronstan Series 55 BB Orbit Block, Double Becket SwivelRF55210 - RF55210

Marsoni

M251S

$78.99

Get it in 3 business days with 1 day shipping. Friday, May 29

Ronstan Series 55 BB Orbit Block, Double Becket SwivelRF55210 - RF55210Ronstan Series 55 BB Orbit Block, Double Becket SwivelRF55210 Series 55 BB Orbit Block, Double Becket Swivel Lightweight Kilogram for a kilogram of working load, BB and RT Orbit Blocks are the worlds lightest. The unique orbital design allows the bearing to only be in the active areas of the floating sheave. This minimizes the mass of the inactive return race and hub. Weight and bulk are further reduced in the different block configurations. The ball

Easy Shipping

Quick Dispatch:

Your Ronstan Series 55 BB Orbit Block, Double Becket SwivelRF55210 - RF55210 orders ship within 1-2 business days.

Delivery Options:

Standard: 3-7 business days
Fast: 2-3 business days
Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your Ronstan Series 55 BB Orbit Block, Double Becket SwivelRF55210 - RF55210 ships.

Need Help?
Questions about Ronstan Series 55 BB Orbit Block, Double Becket SwivelRF55210 - RF55210, sizing, or delivery? We're just an email away.

Live Shipping Estimates:
Enter your location at checkout to see available shipping methods and costs for Ronstan Series 55 BB Orbit Block, Double Becket SwivelRF55210 - RF55210 in your area.

Get Shipping Estimates

Country Zip/Postal Code

Exchange/Return Notes

We offer a 30-day return/exchange service after receiving.
Final sale items are not eligible for returns or exchanges.
To process your return/exchange, please contact us at [email protected]
Please click here for more details>>> Return & Exchange Policy

When I received it, it was so small that I thought it was a toy, or maybe for some 4cyl engine. It is significantly smaller than the original one. When I looked closer, the mount holes did line up, so I tried it. I did have to get shorter mount bolts. To my surprise, it works great! I don't know what the longevity will be, but it made it through a busy august! Considering the price and how small it is, I might just buy a second one to keep on board. Just in case.

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on September 14, 2025

Verified Purchase

Bob Valentine

Massapequa, US

★★★★★ 1

Warning!!!

I was so impressed after install!! Fired right up faster that it ever has in the past, had the boat out about 8 times and CACK!!! They say they will stand behind the product and replace it, but do I risk another day ruined on the river? Btw, I have a Volvo penta 5.0 21.5' Larson I/O

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on September 28, 2025

Verified Purchase

Maris I.

Lexington, US

★★★★★ 5

Perfect fit and functioning. Excellent support

The starter fit perfectly, in my Mercruiser 4.3 from 2004, although it was awkward to replace on my engine due to space constraints. I had a few questions for the supplier and quickly received very descriptive answers. Now the starter works perfect in my boat. In all a very good choice which I really can recommend others.

WAS THIS REVIEW HELPFUL?YesReportShare

Reviewed in the United States on June 27, 2024