Thule WingBar Evo vs SquareBar Evo

Every row below is a published or structural fact about the two listings, not an impression. Where the answer is the same for both bars the row says so, because the identical rows are the point.

Four of those nine rows are identical. That is the argument for taking the cheap bar seriously: you are not buying a weaker rack, you are buying a louder one.

Both of the aero bar’s advantages — less noise, less drag — are collected per mile while the rack is fitted. Neither is collected while the bars are in the garage. So the decision reduces to one number you already know: how many weeks a year will the rack be on the car?

A caveat that overrides the table: if your roof is above shoulder height, buy the aluminum bar whatever your pattern. Repeatedly lifting a steel bar over an SUV roof is how racks end up staying on the car for the wrong reason, and how roofs get scratched.

For the fuel half of the argument at a scale you can act on, our gas mileage guide works from Consumer Reports’ published rooftop-load testing rather than from a manufacturer claim.

This is the underrated half of the decision, because it decides what the rack can become.

The T-slot on the WingBar Evo is a channel that Thule accessories bolt into. The result is lower, tidier and more secure, and it leaves the top of the bar flush. The cost is that it is a Thule-shaped hole: generic carriers, old carriers and marketplace bargains mostly expect something to clamp around.

The square section on the SquareBar Evo is the oldest and most universal mounting shape in the category. Nearly every clamp-on kayak cradle, bike mount, basket and ski carrier ever made will go onto it, including the ones in the back of somebody else’s garage. If you intend to buy used accessories, that is worth more than the noise difference.

So the real question is where the next purchase comes from. Buying Thule accessories? Take the T-slot. Buying whatever is cheap and available? Take the square bar. Our accessories guide covers what is actually worth adding, and the spread and length guide covers the dimension that determines whether a carrier fits at all — which it does, regardless of which bar you pick.

Flush rails. Buy the WingBar Edge. It is the purpose-built pair for that roof, it sits lower, and it is one purchase rather than three.

Raised rails and a tight budget. The raised-rail case needs no fit kit at all, which makes a cheaper brand genuinely competitive here. Our SUV rack roundup covers those options.

Two trips a year on a bare roof. Three purchases for two trips is bad value whichever bar you choose. Look at a soft rack or a bag that needs no bars instead.

And if you are still cross-shopping outside Thule, the full range views are here: the Thule range and the Yakima range.