Ibis was one of the original pioneers of the wide rim revolution that took the mountain bike world by storm several years back. Wider rims give better sidewall support to the tire, which in turn allows you to run lower tire pressure for improved traction and control. Another fact about Ibis is that they're always striving for improvement, and the S35 29in Logo Carbon Boost Wheelset represents the newest addition to their esteemed line of mountain bike wheels. They're even lighter and stronger than the previous generation while delivering an improved ride quality, making them a great choice for riders seeking enduro-worthy strength at a weight that's competitive with most lighter-duty carbon trail wheels. If you're wondering how they compare to the S28 wheels, it simply comes down to the internal width of the rim, with the S35's being designed for wider tires in the 2. 35 - 2. 8in range, and the S28's optimized for more traditional tire widths. When Ibis set out to improve upon their previous wheels, one of the main goals was to make them even lighter and stronger, which was no easy task. To achieve this Ibis knew they had to reduce the height of their beadwalls in order to make them less likely to bend and break. Stan's NoTubes already uses this technology in their existing rims, so Ibis collaborated with them to use their patented Bead Socket Technology (BST), which not only reduces the beadwall heights for improved vertical compliance and ride quality, but also makes it easier to mount tires and provides a more secure tubeless setup. Additionally, the S35 rims are drilled asymmetrically, which improves the bracing angle of the spokes and allows both sides of the wheel have nearly equal spoke tension, resulting in a stronger and more durable wheelset. Ibis also changed up their carbon construction, using a material they call Toughened Hybrid Carbon. The name comes from the toughened resin formula they use in the beadwall, which allows it to flex and better shr...