How to choose crossbars for a kayak

The short answer

If your roof has raised side rails you can get a finger under, buy the MaxxHaul 50220. It publishes 150 lb, it is 52 inches long, and the locks are included rather than sold separately — which is the whole value argument against a branded system that costs four times as much and carries the same boat.

If the rails sit flush with the roof, or there are no rails at all, no clamp bar on this page fits yours. You have two honest options: a branded foot pack like the Thule Evo Clamp with bars on top, which is a serious amount of money, or foam blocks and good straps, which is a legitimate solution rather than a compromise and has its own page here.

And if you already have bars, you may not need a carrier at all. A pair of padded bars and two cam straps will carry one hull perfectly well. That is the last pick on this page, and it is the cheapest thing on it.

Why this page exists

Every rack recommendation on the internet starts after the hard part. “Fit a J-cradle to your crossbars” assumes crossbars. Most cars do not have them, and the carrier you were reading about will not clamp to a bare roof or to a rail that runs front to back.

So before the cradle, the saddle or the stacker, there is a purchase nobody writes about: the bars. They are the part everything else bolts to, they are the part with the load rating that actually matters, and they are the part where the fit goes wrong.

Four roofs, and only one of them is easy

Go and look at your car before reading another word. You are in one of four situations and they have different answers.

• Raised side rails with a gap underneath. Two rails run front to back and you can pass a finger between the rail and the roof. This is the easy case: a universal clamp bar spans them and you are done for well under a hundred dollars.
• Flush rails. The rails are there but bonded down onto the roof with no gap. Nothing clamps under them. You need a vehicle-specific foot pack made for flush rails.
• Fixed points. The car has threaded or capped mounting points under plastic covers in the roof. These take a manufacturer foot pack and nothing else.
• Bare roof. No rails, no points, nothing. Either a clamp-to-the-door-frame foot pack, or foam blocks.

The measurement that matters in the first case is the gap. The MaxxHaul publishes a minimum of 13 mm beneath the rail for its clamp, and a surprising number of factory rails are tighter than that. If you cannot get a finger under the rail, treat yourself as a flush-rail car.

How we judged these

Four criteria, weighted equally, and published on how we pick:

• Published capacity. Does the maker print a load figure at all? On a part holding a boat over a highway, that is the number you check your loaded hull against.
• Fit range. Which roofs it actually works on, and whether the listing publishes the span or makes you guess.
• What is in the box. Locks, straps, hood loops — the things that turn a list price into a real price.
• Total system cost. Not the bar price. The price of every part you need before a kayak is on the roof.

The numbers that decide fit

Two rows in that table do all the work, and they point in opposite directions. Thule publishes the highest capacity by a wide margin. MaxxHaul publishes a capacity at all, includes the locks, and needs no feet — which on a used-boat budget is the row that decides it.

150 lb is more bar than any kayak here needs

It is worth saying plainly, because the instinct is to buy the biggest number available.

A recreational sit-on-top is 50 to 70 lb. A rigged fishing sit-on-top with a seat and a loaded crate in it runs 70 to 100 lb. The MaxxHaul publishes 150 lb. The bar is not your constraint, and paying for 220 lb of published capacity buys you headroom you will never use on a kayak.

What the extra money does buy is fit range, a lock system that matches the rest of a brand’s catalog, and a bar that fits a roof a clamp bar cannot touch. Those are real reasons. A bigger number is not.

Your roof has a rating, and it is the real limit

The bar rating is the easy one. The figure almost nobody checks is the car’s own dynamic roof load — the weight it is rated to carry while moving — and it has to cover the bars, the carrier and the boat together.

It is usually far lower than people assume, and it does not change because you bought better bars. Subaru, for example, publishes separate static and dynamic figures for the Outback’s roof rails, and the dynamic one is the one that applies on the highway. We go through that arithmetic properly on kayak racks for an SUV.

How far apart should the bars be?

This is the question we get asked in the form “what spread do I need”, and the honest answer is that you mostly do not choose it. The car does.

A kayak wants its two support points somewhere around a third of the way in from each end — on a 12-foot boat, roughly four feet apart. Plenty of hatchbacks and compact SUVs put their bars 24 to 30 inches apart, which supports the middle third of the hull and lets both ends cantilever.

One boat tolerates that, and bow and stern lines are what make it safe rather than merely legal. What a short spread does rule out is some carriers: Yakima publishes a minimum crossbar spread of 24 inches for the HandRoll, and load-assist carriers tend to publish the longest minimums of all. Measure your spread with a tape before you buy a carrier, not after.

If your spread is at the short end, the two things that matter more than the bars are bow and stern lines and not stacking a second boat on top of the problem, which is the argument on the two-kayak rack page.

Can the kayak just sit on the bars?

Yes. This is the question that saves people the most money and almost nobody answers it directly.

A kayak hull laid deck-up across two padded bars, strapped down and tied at bow and stern, is a perfectly sound way to carry one boat. Bare metal bars will mark a hull and squeak the whole drive, so the pads are not optional — but a set of pads with straps and hood loops in the box costs a fraction of any cradle.

What you give up is roof width. A hull lying flat takes up most of the bar, which rules out a second kayak or a bike. The moment you want two of anything, a cradle or a stacker earns its place by turning the boat on edge, and that is the whole argument on J-rack versus saddle.

Aero, square or round

Three bar profiles exist and the difference matters less than the marketing suggests, with one exception.

Square is the easiest thing in the world to clamp a carrier to, and essentially every kayak cradle, saddle and stacker is designed around it. Round is the old Yakima standard and equally well supported. Aero bars are quieter and more efficient, and they are the profile where a carrier sometimes needs a specific adapter — check before you assume.

The exception is noise. An empty square bar in the airflow whistles, and you will hear it every day you drive without a boat, which for most people is most days. That is the practical case for an aero bar if the rack is going to live on the car.

What the bars actually cost, all in

The honest arithmetic, because this is where a branded system surprises people.

A clamp bar for raised rails is one purchase. Bars, clamps and locks arrive in one box and the total is the price you saw.

A Thule or Yakima system is not one purchase. It is bars, plus a foot pack, plus — depending on the vehicle — a vehicle-specific fit kit, and the feet alone can cost more than the bars. Work it out before you start, on the maker’s own fit guide, because the number is often three times the bar price.

On a site about used boats that math has a line in it: a rack system costing more than a third of what you paid for the kayak needs a specific reason. A roof that physically cannot take a clamp bar is a very good reason. Brand preference is not.

Locks, and whether they matter

A locked bar stops the bars being lifted off the car. It does nothing about the boat, which is held on by straps anybody can unbuckle.

So the value of a lock is really about where the car lives overnight and whether the bars stay on it between trips. If the rack comes off and goes in the garage, locks are an irrelevance. If it lives on the car in a street or a car park, they stop the easiest kind of theft — and the MaxxHaul including them is worth real money against the branded systems, where lock cores are a separate line item.

Buying bars used

Bars hold their value and turn up second-hand constantly, which on a used-boat budget is worth a look. Three things to check.

That the hardware is complete. Clamps, bolts and end caps are model-specific and expensive to replace, and a set missing its fit kit is a set you cannot use.

That the bar is straight. Sight down it. A bar that has been over-loaded or dropped can be bowed in a way that is hard to see and impossible to fix.

What car it came off. A branded foot pack is fitted to a specific roof. A set that fits the seller’s car may need a different fit kit for yours, which is sometimes most of the price again.

Who each of these is for

Raised rails and a budget: the MaxxHaul 50220. 150 lb published, locks in the box, one purchase, done.

A wide roof where the span is the question: the Amazon Basics Cross Rail. It publishes the span it covers in inches, which is the figure that decides fit, and a longer 56-inch version exists. It does not publish a capacity, and that is the trade.

A published rating and a system you will extend: the Thule SquareBar Evo 135. 220 lb, five lengths, and the profile every carrier is designed around. Remember the feet.

A roof with nothing on it: the Thule Evo Clamp foot pack. 75 kg published, four feet, One-Key locks included. It is the proper answer to a bare roof and it is not cheap.

Bars you already own: the Abahub rack pads. Pads, straps, ropes and hood loops in one box, and no carrier needed for a single hull.

What we would buy

For the person this site is written for — a used kayak, a normal car, no wish to spend rack money twice — the order is simple.

Check the gap under your rails. If there is one, the MaxxHaul and a set of pads carries your boat for less than a hundred dollars all in, and you can add a cradle later if you ever want the roof width back.

If there is no gap and no rail, price the branded foot pack honestly before you commit, then read the foam block page and decide which of the two you actually want. Both are correct answers. Only one of them costs more than the kayak.