The two principal abiogenic petroleum hypotheses, the deep gas hypothesis of Thomas Gold and the deep abiotic petroleum hypothesis, have been scientifically reviewed without confirmation. Scientific opinion on the origin of oil and gas is that all natural oil and gas deposits on Earth are fossil fuels and are, therefore, biogenic.
In short a Thru Axle design incorporates a solid rod or hollowed shaft that passes directly through the hub and both legs of the fork or rear frame members. It is then secured to one side of the fork leg or rear frame member (typically on the brake rotor side) by a threaded mechanical connection.
Driveshafts transfer power from the transmission to an axle assembly. They usually consist of hollow steel tubes with flanges welded at each end to mount U-joints. The U-joints have bearings and attach to yokes at the transmission and axle, to allow the driveshaft to articulate as the axle moves up and down with the suspension. Clunking or squeaking noise may indicate a worn joint, so install one of our quality replacements to avoid complete failure.