In June 2025, the bike wheel specialist Swiss Side found to its dismay that a surprise UCI equipment ruling excluded its 68mm deep HADRON³ Ultimate 680 wheelset from sanctioned races. It had only been brought to market two weeks earlier! So a UCI-compliant wheelset was a challenge that the Swiss Side team and partners rose to.

Four months later, the HADRON³ Ultimate 650 wheelset is released. With a 65mm deep rim it pushes the limit of the latest rulebook, yet remains UCI compliant. As the ruling comes into effect on the first of January 2026, the 680 wheels were still allowed to be used by the Decathlon AG2R La Mondiale team this summer. 

Swiss Side HADRON³ Ultimate 650 w. Tyres
Swiss Side HADRON³ Ultimate 650 w (Image Credit: Swiss Side)

Although only 3mm less deep than the 680, the HADRON³ Ultimate 650 are 33 grams lighter for a pair, yet they keep the 22mm inner rim width in common with the 550, 680 and 850 models. This is also true with the use of DT Aerolite II T-head spokes, Swiss Side / DT Swiss 180 – AERO hubs and SINC ceramic bearings.

The front wheel comes in at 706 grams, the rear 820g, with the pair weighing in at 1526g. This is 135g less than the previous HADRON2 650 version.

The RRP of the wheelset is £1,988, or if you buy direct online from Swiss Side then the price drops to £1,591. You also have the option to pair different (rim) depth wheels if you prefer, along with being able choose which freehub you’d like. The four options are Shimano/SRAM, SRAM XDR, Campagnolo 12-speed, or Campagnolo 13-speed.

Swiss Side HADRON³ Ultimate 650 cornering
Swiss Side HADRON³ Ultimate 650 cornering (Image Credit: Swiss Side)

The HADRON³ Ultimate 650 wheels are optimised for use with a 28/29mm tyre, but are able to perform with tyres between a 25mm to 32mm width. The front wheel now has a 20 spoke count, which reduces weight, but also provides less rotational drag. A hooked bead is used in the rim construction too.

> Best road bike wheels

Swiss Side took this oportunity to develop and enhance riding stability over the 680 model. Swiss Side claims an impressive 12% reduction in steering moment so that cross-wind sensitivity is improved. This was measured at 45km/h, and carries a 0.5W aero drag penalty. A reasonable trade-off, all things considered. 

Alongside its involvement with the Decathlon AG2R La Mondiale Pro team, Swiss Side has two pro triathletes in its race team: 2024 women’s Ironman world champion Laura Philipp, and 2023 men’s Ironman world champion Sam Laidlow. Their wheels have been used to set world record bike splits, too.

It should be noted that the HADRON³ Ultimate 680 still remain legal for any non-UCI events such as triathlons or to anyone just wanting to go “full-gas”, says Swiss Side!

swissside.com