TEST­ING SOON

Zipp prom­ises more speed with the deeper ver­sion of their whale fin-in­spired rac­ing wheel

220 Triathlon Magazine - - Contents -

Zipp 858 NSW Car­bon Clincher

Zipp has made a habit of de­fy­ing

con­ven­tion when it comes to rim pro­file. While other man­u­fac­tur­ers made flat-sided rims, Zipp adopted a toroidal pro­file; where oth­ers used tri­an­gu­lar, pointed pro­files, Zipp un­veiled a less-ta­pered shape and a blunt nose. Now, the U.S. com­pany has in­tro­duced a lumpy, ‘saw­tooth’ pro­file that takes its de­sign cues from the tu­ber­cles found on the front of hump­back whales’ fins.

The rim shape may be fa­mil­iar to you al­ready (we tested the 454 NSW rims in the De­cem­ber 2017 is­sue), but Zipp’s gone deeper with the 858 ver­sion in the hope of de­liv­er­ing a greater aero ad­van­tage with bet­ter cross­wind sta­bil­ity. It’s not just these wheels’ lumps and depth that are im­por­tant, though. They also carry Zipp’s Ax­ial Clutch in their rear hub, Hex­afin dim­ples on their sides and Show­stop­per brake tracks around their edges. You can find out how they mea­sure up to the com­pe­ti­tion in is­sue 349, on sale 22 Fe­bru­ary.

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