How Far Apart are the Mounting Holes for the Rhino-Rack Folding Kayak Carrier?  

Question:

Expert Reply:

Hey Donald, thanks for reaching out!

The mounting holes (or bolts) on the Rhino-Rack Kayak Roof Rack # S512 are 4-1/8" apart (see attached).

I reached out to BillieBars and they said their crossbars are 3.14” wide x 1.57” tall. So this will fit as far as the width goes, but while I had the kayak carrier out I checked the height of the bolts with the mounting plate and with a 1.57" tall bar you'll maybe only be able to get like one or two threads of the wing knobs onto the bolt so I don't think it's going to hold super well.

As an alternative, I highly recommend going with the Kuat Class 4 V2 Kayak Roof Rack # KU33VR instead. This is actually the same carrier that BillieBars highlights on their website, and Kuat did a great job at making their kayak carriers able to work with larger bars as well as the standard ones.

What do you think?

expert reply by: Jon G

0

Bolt Distance Between Rhino-Rack Kayak Carrier Mounting Bolts
(click to enlarge)

Jon G.

9/29/2025

Hey Donald, did you decide to go with the Kuat Class 4 V2 Kayak Roof Rack for your BillieBars system? I'm curious to know if it worked out for you, as it could help others facing a similar decision.

Donald A.

9/29/2025

@JonG Hey so I went with the Kuat class 2 carriers. Different is the class 2 are fixed. Cheaper and less parts to fail i figured. Would like collapsible but maybe in the future. Both the class 2 and the class 4 work with the BillieBars.

Jon G.

9/30/2025

@DonaldA The Class 2 Kit # C2R1B is also a great option - glad to hear you got something that works on your BillieBars!