OutdoorGearLab

Kuat maintains the top spot on our podium for fork mount roof racks for the second year in a row with their Kuat Trio. True to its name, it's ready to handle the three most common axle configurations right out of the box. An improvement over the tried and true design of the fork mount rack, Kuat has devised an innovative solution that can carry bikes with any axle standard at the fork. It's ready to handle your 9mm, 15mm, or 20mm size axles. The Trio does not require an expensive adapter to hold your through-axle-equipped bike, although an additional adaptor can be purchased to accommodate the wider fork spacing of fat bikes and bikes with plus-sized tires. 
Versatility is high on the list of the Trio's strengths, and it can be mounted to almost any crossbar style using a U-bolt style clamp. They also designed a convenient cut-away to supply clearance for disc brake calipers that are common on many modern road, mountain, and gravel bikes. A cable lock that extends from the back of the rack rounds out the great design, making the Trio the most versatile, secure, and easy-loading fork mount roof rack we've tested. 
Read more: Kuat Trio review

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walmart

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Wirecutter

This roof rack is another option if you don’t have a hitch mount. It’s easy to install, holds the bike securely without contacting the frame, and allows easy access to your car. Like all roof racks, though, the HighRoad is harder to load bikes onto than our other picks.

bazaarvoice

expert-review

Yakima Highroad vs Highspeed Bike Rack Review - Active Gear Review

The Thule UpRide is a high-quality bike rack that has a lot going for it. For those who are used to more traditional fork-mount roof racks, the UpRide may seem like an odd design. There is no wheel removal necessary, and the bike is secured by two counteracting cradles, or hoops, that squeeze the front wheel from both directions. This wheel holding design ensures that there is no contact with the frame or the fork of the bicycle and the hold is exceptionally secure. Perhaps more importantly, the absence of frame or fork contact makes this an excellent choice for riders with fancy carbon frames or those who take pride in the cleanliness or appearance of their bike. While other designs can lead to some scuffing on the fork or top-tube, your beloved bike will be safe and pristine on the UpRide.
Although we love how secure the hold is, you may need to adjust the rack to the appropriate wheel size before loading if you switch between bikes regularly. This is a minor inconvenience that does detract slightly from its user-friendliness. Given the rooftop location, this rack obviously involves lifting your bike up high to load it. This makes it best suited for lower vehicles and lighter-weight bikes. Lock cores also aren't included but are available as an aftermarket purchase.
Read more: Thule UpRide review

Rooftop Bike Rack Comparison