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Swiss Side Hadron² Ultimate 500 Disc review

Climb-friendly aero wheels

Our rating 
4.5 out of 5 star rating 4.5
GBP £1,958.00 RRP | EUR €2,288.00
approx – based on exchange rate at time of writing
Swiss Side Hadron² Ultimate 500 Disc carbon road wheelset

Our review

If you want a fit-and-forget, reliably rapid all-conditions wheelset, the Ultimate 500 is a classy option
Pros: Decent weight; confident all-round performance
Cons: Price; alternative freehub body costs
Skip to view product specifications

Hot on the wheels of the recently tested Ultimate 625 Disc wheelset comes the Hadron² Ultimate 500 Disc.


At 50mm tall, the rims are shallower and, according to Swiss Side, designed to maximise handling and aero stability in high-wind conditions by minimising sensitivity to gusty crosswinds.

They are similarly priced, and certainly not a budget option at €2,288 (around £1,958) for the front-and-rear wheel combo.

Only available for disc brakes, and for clincher or tubeless tyres, they have a lifetime warranty against defects.

Swiss Side Hadron² Ultimate 500 Disc specifications and details

With the supplied tubeless tape and 12mm end caps installed, our pair weighed 1,486g, which is good for a reasonably deep, modern tubeless wheelset.

In line with the Ultimate 625, the Ultimate 500 Disc rims are 20mm wide internally, but externally 3mm narrower than the 625 at 27mm.

Swiss Side says this internal width is optimised for minimum rolling resistance with 25mm (recommended on the front) and 28mm tyres. Tyres as wide as 64mm are compatible, although aerodynamic performance will be compromised above 28mm.

Ever-reliable DT Swiss 180 Dicut Center Lock disc hubs with SINC ceramic bearings promise smooth running and minimal rolling resistance, and although it’s hard to quantify without testing apparatus, they do spin freely for a surprisingly long time in a workstand.

A pair of Schwalbe Pro One 25mm tyres slipped on with no drama, seated with a track pump and sealed in textbook fashion.

The rim’s internal width opened the tyre out to a measured 28mm wide, allowing plenty of scope to finesse comfort and grip levels through decreased pressures.

Swiss Side Hadron² Ultimate 500 Disc performance

Swiss Side’s wind tunnel drag figures state that, compared to a ‘standard’ wheelset, the Ultimate 500 can save 6.7W at 35km/h, which equates to a minute over a 40km distance.

Its deeper wheels improve on these test figures, but can bring real-world compromises.

Not long ago, 50mm-deep rims could be a handful in less than ideal conditions, but throughout testing the Swiss Sides were so benign in character that we had to remind ourselves to concentrate on their performance.

Even on gusty autumnal rides, there were no white-knuckle moments when hit by sudden crosswinds.

Rapid freehub engagement and low rotational weight gives the Swiss Sides a lively response on rolling terrain, followed by aggressive acceleration and almost effortless sustained speed.

They’re stiff enough for effective sprinting and short, steep climbs, and light enough to maintain a high pace on long ascents.


For all-round daily riding, they’re an ideal blend of aero and physical efficiency, with no significant performance or practical compromises.

Product Specifications


Price EUR €2288.00GBP £1958.00
Weight 1,486g – as tested for set
Brand Swiss side


Brake type Disc
Freehub Shimano, SRAM 10&11 speed freehub as standard
Hubs DT Swiss 180 Dicut Center Lock disc hubs
Rim depth 50mm
Rim internal width 20
Rim material Carbon
Spoke count 24 front, 24 rear
Spokes DT Swiss Aerolite II spokes and Aero Comp II Straightpull spokes
Tubeless compatibility Tubeless ready
Tyre type Clincher and tubeless
Wheel size 29in/700c