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2. Rolling resistance - Wikipedia

   en.wikipedia.org/wiki/Rolling_resistance

   Any coasting wheeled vehicle will gradually slow down due to rolling resistance including that of the bearings, but a train car with steel wheels running on steel rails will roll farther than a bus of the same mass with rubber tires running on tarmac/asphalt. Factors that contribute to rolling resistance are the (amount of) deformation of the ...

3. Centreless wheel - Wikipedia

   en.wikipedia.org/wiki/Centreless_wheel

   A working prototype of a centreless wheel, using ball bearings, was shown at India Bike Week 2014 in Goa. Attached to a customized Royal Enfield motorcycle, the prototype rear wheel was designed by a team by the name of Freedom Sprints, which included Abhishek Sharma, Ankur Tiwari, Sarvesh Khemka, Yashodeep Yadav, and Mohammed Ansar. [ 14 ]

4. Bearing (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Bearing_(mechanical)

   A ball bearing. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts.The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by controlling the vectors of normal forces that bear on the moving parts.

5. Rolling-element bearing - Wikipedia

   en.wikipedia.org/wiki/Rolling-element_bearing

   The bearing has inner and outer races between which balls roll. Each race features a groove usually shaped so the ball fits slightly loose. Thus, in principle, the ball contacts each race across a very narrow area. However, a load on an infinitely small point would cause infinitely high contact pressure.

6. Train wheel - Wikipedia

   en.wikipedia.org/wiki/Train_wheel

   A railway wheel's tread and flange and its relationship to the load-bearing rail. The running surface of most train wheels is conical, which serves as the primary means of keeping the train aligned with the track while in motion. The wheels are fixed on an axle, and when rounding a curve the mass of the train pushes the wheelset towards the ...

7. Land Rover Discontinued Steel Wheels, but You Might Not ... - AOL

   www.aol.com/land-rover-discontinued-steel-wheels...

   Defenders are no longer available with steel wheels, but the Type 9013 aluminum wheels are a pretty convincing facsimile.