{"product_id":"zipp-1zero-hitop-sw-disc-brake-centerlock-29-wheel-rear","title":"Zipp 1ZERO HITOP SW Disc Brake Centerlock 29\" Wheel - Rear","description":"\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eZipp 1ZERO HITOP SW Disc Brake Centerlock 29\" Wheel - Rear\u003c\/strong\u003e is Zipp's answer to a question a lot of cross-country riders have been asking: why does a fast XC wheel have to feel harsh on rough trail? The rim runs a very shallow 21.1mm depth, a deliberate departure from the deep aero profiles Zipp built its name on, because on singletrack, absorbing terrain matters more than cutting through the air.\u003c\/p\u003e\n\u003cp\u003eThat shallow depth is tied directly to Zipp's HiTop compliance technology, a proprietary carbon layup tuned to flex in a way that passes less feedback through to the rider. Where a stiffer XC rim transmits every root and rock strike straight up through the frame, this rim is built to absorb the small, high-frequency impacts that happen too fast for a bike's suspension to fully react to. In practice, that means more traction and composure through chattery, rough sections, and a rider who can carry speed through terrain that would otherwise bounce a stiffer wheel off-line. The rim also uses what Zipp calls a winged design at the hookless bead — a broader profile that gives the tire more surface area to rest against during a hard rock strike, cutting down on the chance of a pinch flat compared to a narrower bead edge.\u003c\/p\u003e\n\u003cp\u003eThe rim carries a 30mm internal width and 37.7mm external width, an asymmetrical profile sized specifically around the 2.35 to 2.4-inch tires that dominate current cross-country racing. Zipp built the whole system around bikes running up to 130mm of suspension travel, covering everything from a rigid-feeling hardtail to a short-travel full-suspension XC race bike, which makes this wheel relevant whether a rider's chasing lap times on a smooth course or picking through a genuinely technical one.\u003c\/p\u003e\n\u003cp\u003eUnderneath, the wheel runs Zipp's ZM2 SL hubset, an aluminum hub with a six-pawl compression freewheel system that delivers 66 points of engagement — quick enough to matter when a rider needs power down the instant they're back on the pedals after a technical section. The hub uses a Center Lock rotor fixture and is available with a Microspline or XD driver body depending on the drivetrain. Twenty-four Sapim CX-Ray steel spokes lace the rim to the hub on both front and rear, a spoke count and pattern built for a balance of low weight and the stiffness a race wheel still needs at the hub-to-rim interface.\u003c\/p\u003e\n\u003cp\u003eZipp also builds the 1ZERO HiTop SW around its TyreWiz 2.0 system, a valve-integrated pressure sensor that gives a rider real-time tire pressure data instead of a guess from a squeeze test before the start line. On an XC wheel this tuned to a specific tire width and travel range, knowing exact pressure matters more than it does on a general-purpose trail wheel, and it's the kind of detail that separates this wheel from a simpler carbon hoop. As a complete pair, the 1ZERO HiTop SW wheelset is built light — Zipp lists it around 1,325 grams claimed — while still carrying a 130kg system weight rating, so it's built for racing without asking a rider to baby it on rough terrain.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Zipp","offers":[{"title":"Black \/ Microspline","offer_id":43522093875244,"sku":"00.1918.720.002","price":1075.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ XD Driver","offer_id":43522093908012,"sku":"00.1918.720.000","price":1075.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/7684\/9196\/files\/zipp-1zero-hitop-sw-disc-brake-centerlock-29-wheel-rear-5624076.jpg?v=1771295948","url":"https:\/\/ricycles.com\/products\/zipp-1zero-hitop-sw-disc-brake-centerlock-29-wheel-rear","provider":"RA Cycles","version":"1.0","type":"link"}