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.
On front and all-wheel drive cars, the axle shafts are what connect the transmission with the wheels, driving the vehicle along. In order to maintain power to the wheels while allowing the wheels to turn left and right as well as travel up and down over bumps, the axles use flexible joints called CV joints. This is a view of a front, outer drive axle joint boot or âCVâ boot (stands for Constant Velocity) that has torn open. The greasy mass inside is the actual joint itself.