UltraLight 235 CX Road Disc 650B


UltraLight 235 CX Road Disc 650B

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  • Weight: Set 1290g, Front 580g, Rear 710g, Rim355g
  • Front Axle: QR 100mm, 9x100mm, 12x100mm, 15x100mm
  • Driver: Shimano/SRAM HG, Campy 11-speed or SRAM XD-R, 6 degree engagement, 3 pawl freehub, 60 point drivering
  • Tire Width: 33-55mm
  • Size: 650B / 27.5"
  • Rim:  23.5mm inner width // 27mm outer width
    Tubeless Ready
  • Rear Axle: QR 135mm, 10x135mm, 12x135mm, 12x142mm
  • Brake Rotor Interface: Center Lock or ISO 6 Bolt
  • Rider Weight: Recommended 210lbs/95kg max
  • Note: Skewers Not Included

A secret weapon

UL235CX Disc was developed for comfort and control on gravel and mixed terrain. We take our Ultralite235 mountain rim and lace it to our Road Disc Chassis. The result is a 1290g race-ready tubeless, disc-only equipment advantage. The added volume of the wide rim allows the tire to float over chatter and washboard surfaces. Plus the feathery weight will be welcome long into a ride like Dirty Kanza or Trans-Iowa. Due to the 23.5mm inner rim width we strongly recommend tires of 35mm and wider.

Maximum Tire Pressures by Size

650 x 35-38     -  55 PSI
650 x 40-44    -  50 PSI
650 x 45-49     -  45 PSI
650 x 50-55     -  35 PSI
27.5 x 2.0-2.25  - 35 PSI


Found on all of our road disc wheels, this lacing pattern reduces wheel weight and promotes even spoke tensions, while maintaining excellent durability. Rear wheels feature 16 spokes on the rear drive side flange, paired with 8 opposing spokes. Due to the rear wheel dish caused by the cassette on the rear wheel, this orientation evens out spoke tension. It also reduces peak stress loads on the spokes and rim, as well as the fatigue cycle incurred in a traditional 24 spoke wheel - allowing a lower spoke count and lighter weight, without the durability issues and increased rim weights commonly associated with low spoke count wheels. 


Rated to withstand 700 ft/lbs of torque!  We reduced the pawl count to 3 instead of 6, for lower drag and weight, while still achieving and industry leading (for road hubs) 6 degree engagement.  Relocated bearings, and a new freehub seal reduce freehub drag while coasting.  


Like all of our System Wheels, you can customize your hubs and nipples for an additional fee. We offer 11 custom anodized colors: Orange, Purple, Turquoise, Lime, Gold, Green, Blue, Red, Pink, Silver and Black. Visit our AnoLab Custom Wheel Designer to customize your i9s.

i9 is proud to partner with Stikrd.com to offer custom decals for all i9 rim models. Click here to order a set for your new wheelset, or give a fresh look to your current i9 rims.