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Cosine 45mm Full Carbon Clincher wheelset



Brilliant value for money carbon clinchers – they're fast, stiff and comfortable

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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We've asked in the past whether an upgrade to carbon fibre wheels is worth it. Well, if these Cosine 45mm carbon clinchers are anything to go by then the answer is a resounding yes, and not just for performance – comfort also receives a boost.

Cosine is the new component wing of online retailer Wiggle. It started off with a range of wheels, two alloy and three carbon fibre, and by the looks of the pricing structure, value for money is the main drive.

> Buy these online here

For example, these 45s in for testing are priced at £600 – not bad for a set of full-carbon clinchers – and that price is the same for both the 30mm and 50mm-deep rim wheelsets. There aren't many on the market that can compete with that. In fact the only set we've tested recently that can match the Cosine is the Club Roost FCR50.

Cosine 45mm Carbon Clincher wheelset - rim.jpg

It's no point being cheap if you can't back it up with some kind of performance, though, and thankfully the Cosines aren't found lacking here.

At 1710g they aren't in the superlight category, but then again not many deep-section carbon wheels are because of the extra material. The acceleration of the Cosines is impressive and certainly belies what you'd expect from wheels of this weight.

The freewheel engagement of the Cosine branded hub is instant and the wheels really whip up to speed. I tested these on a bike that had been running the Mavic Ksyrium Elite wheelset that we reviewed a couple of months back and the extra 130g wasn't noticeable at all.

Cosine 45mm Carbon Clincher wheelset - rear hub.jpg

Comfort is the biggest surprise, though. Going from a relatively shallow alloy rim to a mid-depth carbon one with the same tyres was like letting 20-30psi of pressure out. It's not because they lack stiffness either; under hard acceleration and climbing there is no flex at the rim at all.

The rims are made by Gigantex, a company based in Taiwan which specialises in carbon fibre components and wheels for a lot of the big bike brands. They follow the latest style of wide rims with an internal width of 19mm (23.4mm external), which gives you a more rounded profile if you are using a wider tyre, 25 or 28mm, rather than a 'lightbulb' shape. It's much better for aerodynamics in terms of frontal area as the transition from tyre to rim is much smoother.

Cosine 45mm Carbon Clincher wheelset - rim bed.jpg

Trying out some 23mm tyres saw them stretched out to 25.5mm, with the wider profile increasing grip thanks to a larger surface area.

The shape of the 45mm deep rim is also more bulbous, with a rounded trailing edge that a lot of wheel manufacturers have claimed is more aerodynamic than a more traditional V-shape profile seen on earlier carbon wheels.

Cosine 45mm Carbon Clincher wheelset - nipples.jpg

Whatever the science says, the Cosine wheels are quick and certainly roll well over undulating terrain. You get the odd bit of buffering from crosswinds, which might affect you a bit if you're a light rider, but I've certainly ridden much, much worse.

The hub bodies are 7075 alloy and come with sealed bearings. It's been a mild, wet winter so far in the south-west and these wheels have seen plenty of rain and standing water with no ill effects.

Cosine 45mm Carbon Clincher wheelset - front hub.jpg

The only issue I did find was with the rear freehub body; the coating added to reduce wear and tear on the splines had been laid on a couple of microns too thick, making the fitment of the cassette hard work. After an initial fitting, the cassette body removed the coating from between the splines. It shouldn't be an issue long-term, though, as it's not in a position where the cassette body tends to 'bite'.

The rest of the build is completed with Sapim CX Delta spokes, 20 front and 24 rear, which are secured to the rim with brass nipples.

> Check out our buyer's guide to road bike wheels here

The braking surface has markings on it to make sure the pads sit below the actual lip where the clincher tyre locates – a good idea for long-term use. In terms of braking power, the included pads are very good. They feel like soft rubber and really grab hold of the rim, with a fair amount of modulation, even in the wet. It's one of the best carbon rim/pad compound combinations I've used.

Overall I rate the Cosine wheels very highly indeed. They offer a very quick, comfortable ride and are excellent value for money. The 45mm-deep rims make for a very usable wheelset for the majority of road and weather conditions. A rider weight limit of 90kg might limit their appeal to some, though.


Brilliant value for money carbon clinchers – they're fast, stiff and comfortable

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Make and model: Cosine 45mm Carbon Clincher wheelset

Size tested: n/a

Tell us what the wheel is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

Cosine says, "Designed to provide a blend of aerodynamic performance and agility; perfect for versatile cyclists who tackle everything from undulating sportive courses to long, flat distance rides."

They are very versatile. The rims are easy to ride in strong crosswinds and climb well too.

Tell us some more about the technical aspects of the wheel?

45mm mid profile full carbon clincher rims

Matte UD carbon finish

Low rotational weight for reactive performance

23.4mm external width for increased cornering stability

7075 Alloy hubs with smooth rolling sealed cartridge bearings

Sapim CX Delta® spokes with CN-14G Brass nipples

High Power Carbon specific brake pads included

COSINE custom rim tape

11 speed Shimano®/SRAM® compatible freehub body

Spacer supplied for 10 speed compatibility

Lightweight alloy skewers

Rider weight limit: 90kg

Spokes; Front; 20 Rear; 24

Rim depth: 45mm

Rim width: External; 23.4mm Internal; 19mm

Rate the wheel for quality of construction:

The tolerances on that freehub coating brings the score down a notch, other than that though the build quality is very good.

Rate the wheel for performance:

The Cosines are stiff yet surprisingly comfortable compared with an alloy rim.

Rate the wheel for durability:

Trueness has remained good, as have the sealed bearings over the test period.

Rate the wheel for weight

Pretty good considering the build; they ride quicker than their weight on paper would suggest.

Rate the wheel for value:

Very good value for full-carbon clinchers.

Did the wheels stay true? Any issues with spoke tension?

Yes, they remained true and tight.

How easy did you find it to fit tyres?

Both 23 and 25mm tyres fitted with ease just using your hands.

How did the wheel extras (eg skewers and rim tape) perform?

The rim tape is plenty wide enough for the rim bed. You also get alloy QR skewers which are basic but do the job. The most impressive component, though, was the stock pads, with impressive braking performance.

Tell us how the wheel performed overall when used for its designed purpose

A great all-rounder whether you're gunning it or just out for a long, steady ride.

Tell us what you particularly liked about the wheel

The comfort.

Tell us what you particularly disliked about the wheel

The overly thick coating on the freehub.

Did you enjoy using the wheel? Yes

Would you consider buying the wheel? Yes

Would you recommend the wheel to a friend? Yes

Use this box to explain your score

The 45mm Cosine Carbon Clincher wheels are really very good. The performance and stiffness benefits are impressive, but it's the comfort that is most noticeable over that of an alloy rimmed wheel. You can get lighter carbon wheels with a little more refinement but you'll pay a lot more for the privilege.

Overall rating: 8/10

About the tester

Age: 37  Height: 180cm  Weight: 76kg

I usually ride: Kinesis T2  My best bike is: Mason Definition

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed

With 20 years of road cycling and over 150,000 miles in his legs it's safe to say Stu is happiest when on the bike whatever the weather. Since writing his first review for back in 2009 he has also had a career in engineering including 3D-CAD design and product development, so has a real passion for all of the latest technology coming through in the industry but is also a sucker for a classic steel frame, skinny tyres, rim brakes and a damn good paintjob.
His fascination with gravel bikes is getting out of control too!

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