The Relentless Fork from Addict is exaclty that! With a lot of testing, it will take whatever sized gap you're game enough for. The fork comes with two sets of spacers which allows you to run the new 30mm wide Radix wheels. A steel insert for the compression bolt will let you tighten your headset up to the max.
Specifications of the Addict Relentless Fork: Weight: 391 grams Material: 6061 Aluminium Steer tube length: 165mm Offset: 10mm Wheel compatibility: 115mm / 30mm Compression: HIC / SCS