Following on from Zipp’s 303 designs launched last year, with the sub-£1,000 303 S and lighter, wider 303 Firecrest, Zipp has revealed the wheelset to replace the premium 303 NSW.
The 303 NSW has been superseded by the new 353 NSW – and that means Zipp’s Sawtooth rim shape is back.
It’s a radical departure from the 303, with the 353 adopting the humpback whale-inspired shape that debuted in 2016 on the 454 NSW. Beyond that, however, it’s the lightest clincher disc wheelset Zipp has ever produced, with a claimed weight of 1,255g, and the hookless rim is optimised for 28mm tyres.
Zipp’s new 353 NSW | What you need to know
At a claimed 1,255g, these are the lightest clincher disc wheels Zipp has producedThe hookless rim is optimised for 28mm tyresThe new Axial Clutch V2 rear hub is apparently the lowest friction hub Zipp has madeNSW stands for ‘Nest Speed Works’ – Zipp’s engineering studio at its Indianapolis HQThe sawtooth rim shape was inspired by tubercles found on the fins of a humpback whale
The whale-inspired Sawtooth shaping of the 353 is certainly distinctive. The ‘ABLC’ dimples on the rim surface are shaped to match the Sawtooth shape, according to Zipp.Warren Rossiter/Immediate
The wavy inner edge of the rim shape – which Zipp terms ‘Hyperfoil nodes’ – is designed to act like a deeper rim (45mm deep, like the 303), while reducing the sidewall profile and behaving in a more stable manner under high crosswinds.
The shape is enhanced by the ‘hexfin ABLC simple patterning’. What’s that? For years, Zipp has used dimpled sidewalls to aid aerodynamics, but with this waved rim, the dimples vary in size and are arranged in strips that lead off from the taller sections of the rim.
Zipp claims this pattern aids both crosswind stability and aerodynamic performance.
It’s not all about aero anymore
The 353 NSW is the lightest disc clincher wheelset Zipp has ever made.Warren Rossiter/Immediate
Zipp was one of the original innovators of pure aerodynamic performance in wheels. The original Firecrest design – with its blunter, rounded profile – helped set the benchmark for aero rim design, and it’s hard to find any wheel on the market right now that doesn’t owe a debt to the Firecrest.
Now, however, Zipp puts emphasis on making a wheel that’s more (excuse the pun) rounded in performance terms. Zipp sees this as a balancing act between aerodynamics, gravity, rolling resistance and vibration losses.
Aerodynamic performance is a key part of any speed-focussed wheel design, but it’s most apparent for flatline speed, sprints and time trial/triathlon. For the 353 NSW, which Zipp classifies as a premium endurance wheel, aero performance has less priority.
It’s the gravity element where Zipp sees big gains for the 353, so it was key to getting the weight as low as possible and, at a claimed 580g for the front and 675g for the rear, these NSW wheels are the lightest clincher disc wheels Zipp has ever made. Lighter even than the new 303 Firecrest by 100g.
The set we’ve received for testing has tubeless valves, 12mm endcaps, an XDR freehub body and tubeless tape in place. The front weighs 600g and the rear 704g, adding up to 1,304g for the pair, which still makes them lighter than the 303 Firecrest by 51g.
Zipp’s Sawtooth rim profile was inspired by the fins of a humpback whale.SRAM
Like the 303, weight has been saved by moving to a hookless rim design. By switching to a rim shape that’s simpler to manufacture, Zipp says it can make the rims lighter and stronger, and with less waste.
For rims with a hook, silicone mandrill is used in the moulding process to create the lip. These silicone pieces can only be used once and then the rim requires plenty of finishing, which leads to waste carbon.
With hookless designs, the moulds are solid metal and can be used thousands of times, plus the rim comes out of the mould in a near-finished state, so there’s less waste. However, if you have a hookless rim, you need to make sure your tubeless tyre is compatible with hookless.
The hookless rim measures 25mm wide internally and is recommended for use with 28mm tyres.Warren Rossiter/Immediate
Zipp also says the rim is optimised for the wide tyres popular on the latest road bikes. The 25mm internal width is recommended for 28mm tyres and above.
Meanwhile, the Cognition Axial Clutch V2 rear hub uses the same principle as the original Cognition hub – when it freewheels, the freehub is pushed apart to disengage by opposing magnets.
Our test pair of wheels come up at 600g for the front (including tubeless valves, rim tape, and 12mm end caps).Warren Rossiter/Immediate
The rear wheel tips the scales at 704g, including tubeless valves, rim tape, 12mm end caps and an XDR freehub.Warren Rossiter/Immediate
On the original design, this involved a dozen separate parts. The new V2 design houses all these elements into a single piece and friction is further reduced by incorporating a ‘foam’-like damper made from Sylomer, used throughout the motor industry as a vibration-isolating element.
The freehub engages at 54 points and Zipp claims the new hub reduces friction and engages/disengages much faster than the already impressive Cognition design. Zipp also states it’s upped the quality of the bearings and reduced weight here, too.
The wheels are laced with 24 spokes front and rear (regular metal spokes rather than anything too complicated), with the lay-up of carbon fibre in the rim adding some vibration absorption, according to Zipp. This, paired with the wider rim width and compatibility with wider tyres, should help things roll smoothly, according to Zipp.
Best road bike wheelsBest tubeless tyres
The new Cognition hub is simplified, lighter and has less friction than previous models.SRAM
The 303 family
The 353s are the last piece of the puzzle for Zipp’s ever-popular all-rounder series, meaning the company now has the 303s, 303 Firecrest and the 353 NSW.
Weight: 1,530gHubset: 76/176Rim width: 23mmRecommended tyre: 25mmPrice: £985 / $1300 / €1100
Weight: 1,352gHubset: ZR1Rim width: 25mmRecommended tyre: 28mm+Price: £1600 / $1900 / €1800
The 353 NSW rim is 25mm wide internally, and according to Zipp, optimised for use with 28mm tyres.SRAM
The 353 NSW rear wheel is available with HG and XDR freehubs. Campagnolo freehubs are available separately.SRAM
At just 1255g, this is Zipp’s lightest-ever tubeless clincher disc wheelset.SRAM
The 353 NSW is Zipp’s first wheelset to use the Sawtooth rim profile since the 454.SRAMWeight: 1,255gHubset: CognitionRim width: 25mmRecommended tyre: 28mm+Price: £3200 / $4000 / €3600
Prices and availability
The new 353 NSWs should be in stores now, priced at £1,425 / $1,800 / €1,600 for the front wheel and £1,775 / $2,200 / €2,000 for the rear wheel, with either a Shimano/SRAM 11 freehub or XDR hub (Campagnolo freehubs are available separately).
We’ve received a test set of 353 NSWs, so expect a full review this summer.
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