Shockingly light. Blindingly fast.

The Ares4 does it all. With its 42mm Delta rim profile and paired-spoke technology, it perfectly balances aerodynamics with light-weight. You’ll float up long-climbs, save watts on windy flats, master technical descents with confidence and end the day with a smile. 

The all-new rim profile features a 20mm internal width and tubeless-ready technology for improved ride quality and compatibility with a range of tire widths. They feature our US-made hubs with Enduro bearings, titanium freehub body and T2 high engagement for instant accelerations and a long life – no matter how hard you hammer. 

Disc and rim brake options are available. Add a tubeless kit to your order and you’ll have what you need to get set up in a snap.

All Rolf Prima orders are built by hand in Eugene, Oregon. 

*We do our best to ship your wheel order ASAP, but because your wheel orders are custom built, please allow up to 2-4 weeks for shipment once your order is processed.  Contact for more information!


  • Weight: 1520g [700g/820g]
  • Rim: Carbon clincher
    • Rim Depth: 42mm 
    • Rim Width (max): 28.5mm, 19.5mm internal
    • Tubeless compatible [kit required]
  • Brake type: Disc brake, Center Lock
  • Spoke count: 20/20
  • Spoke type: Sapim CX-Ray, bladed
  • Hubset: XST 4.4 
    • T2 High Engagement
    • Enduro steel cartridge bearings
    • Front axle: 15mm, 12mm, 9mm
    • Rear axle: 142mm, 135mm
    • Freehub: CNC Machined 6al4v Titanium
    • Freehub compatibility: Shimano HG 10/11, SRAM XDR 11/12, Campagnolo 11/12, N3W
    • Made in the USA
  • Tire size and pressure recommendation: Please refer to chart in product images
  • Includes: rim strips, valve extender and Rolf Prima's Certainty