Giant SLR 0 42mm disc wheelset review

The Giant SLR 0 is a pro-level wheelset which, in this 42mm version, offers light weight as well as an aerodynamic advantage

Giant SLR 0 42mm Disc Wheelset
Cycling Weekly Verdict

The Giant SLR 0 42s are impressively light wheels with a precisely judged rim depth that performs in all scenarios, but to get the very best out of them they ought to be run tubeless.

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    Aerodynamic but stable in crosswinds

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    Good value for money

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    Clincher tyres don't always seat easily on tubeless rim

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    17mm internal rim width is quite narrow by modern standards

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Giant is one of the big players in cycling with an R&D budget to match, and in the case of its excellent ‘Wheelsystems’ it has spent wisely.

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Like Shimano with its C40, Giant highlights its unique approach to spoking its disc-brake wheels – which unlike rim-brake wheels have to take into account braking forces applied at the hub as well as pedalling forces. The SLR 0s are radially spoked on the non-disc side front, which may gain it a very slight aero advantage over many of its rivals’ two-cross fronts. Both sides at the rear are laced two-cross. Both wheels use DT Aerolite bladed straight-pull spokes.

Giant SLR 0

Non-disc-side front is radially spoked

The Giant SLR 0 rim is on the narrow side by modern standards with an internal width of 17mm, which means that for best aerodynamics you’d need to stick with narrower tyres – in the absence of wind tunnel data it looked like 25mm at widest – and sacrifice a bit of comfort.

>>> Best road bike wheelsets reviewed 2019

On the subject of tyres, in the past we’ve had an issue with getting a standard clincher to seat properly on Giant's tubeless-ready rim – specifically with the SLR 1 wheel that sits below this one in the range. Giant suggested using a tyre installation lube or soap solution to get a brand new clincher to seat, as you would with a tubeless tyre. This time a set of Panaracer Race C Evo 3s went on easily without needing lube but for the rear to seat evenly with no low spots it took a blast from a compressor.

Giant SLR 0

Quiet freehub is good for silent attacks and doesn't drown out conversation

On the road the Giant SLR 0 wheels felt crisp and fast. Their lovely low weight – at 1.46kg the lightest of six in our 'fastest deep-section carbon wheels' grouptest in the April 11 issue –  took them up hills very quickly, matched by a lateral stiffness that perfectly countered the biggest efforts and highest torque in a low gear.

Unlike deeper wheels, they weren’t too affected by gusting crosswinds, just requiring a little bit of extra attention on windy, fast descents.

With its 42mm rim Giant has found a sweetspot in which the SLR 0 is incredibly fast both on the flat and on climbs.

The freehub is one of the quietest we've ever come across – in contrast with Hunt 50 Carbon Aero Disc's swarm-of-angry-bees inspired noise – which makes it perfect for launching unexpected attacks as well as making chatting easier on the clubrun.

However, the Giant SLR 0 rims were slightly clattery on rough surfaces, possibly partly because of the narrower rim. Using tubeless tyres at a lower pressure would resolve this.

Giant SLR 0

Giant rims can be de-stickered if required

Lastly, if you’re worried you might lose style points for pick-and-mixing Giant SLR 0 wheels with your Pinarello or similar Italian superbike, the SLR 0s can be easily de-stickered.

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Simon Smythe
Simon Smythe

Simon Smythe is Cycling Weekly's senior tech writer and has been in various roles at CW since 2003. His first job was as a sub editor following an MA in online journalism.

In his cycling career Simon has mostly focused on time trialling with a national medal, a few open wins and his club's 30-mile record in his palmares. These days he spends a bit more time testing road bikes, or on a tandem doing the school run with his younger son.

What's in the stable? There's a Colnago Master Olympic, a Hotta TT700, an ex-Castorama lo-pro that was ridden in the 1993 Tour de France, a Pinarello Montello, an Independent Fabrication Club Racer, a Mercian Classic fixed winter bike and a renovated Roberts with a modern Campag groupset.

And the vital statistics:

Age: 53
Height: 178cm

Weight: 69kg