Xceed wheel trimmer
Xceed RC introduce a special trimming tool for 1/8th and 1/10th scale on-road rims. Designed to remove material from the inner part of the wheel, the result is a more flexible rim that generates more grip. The tool sports a specially shaped and adjustable cutting part to become useable with a wide variety of wheels. Both an 1/8th and 1/10th scale variant are available.
Source: Xceed [xceedrc.com]