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.
Full Definition of AXLE. 1. a: a pin or shaft on or with which a wheel or pair of wheels revolves b (1) : a fixed bar or beam with bearings at its ends on which wheels (as of a cart) revolve (2) : the spindle of such a beam.2. archaic: axis. See axle defined for English-language learners.ull Definition of AXLE. 1. a: a pin or shaft on or with which a wheel or pair of wheels revolves b (1) : a fixed bar or beam with bearings at its ends on which wheels (as of a cart) revolve (2) : the spindle of such a beam. 2. archaic: axis. See axle defined for English-language learners.