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Merida Big Seven mountain bike with Schwalbe Racing Ralph 27.5″ tires. 27.5 mountain bikes are mountain bikes which use a large volume tire that is approximately 27.5 inches in diameter, 56 mm wide (ISO 56-584 / 27.5 × 2.25) on an ISO 584 mm rim.
The larger diameter of the head tube and headset gives added stiffness to the steering portion of the bicycle. Common sizes. 25.4 mm (1 in) steerer tube, this may have a fork crown (the base of the fork steerer tube) of a number of different dimensions, and milling may be necessary to make some headsets fit. 26.4 mm crown race (ISO standard)
The head tube is the part of a cycle's tubular frame within which the front fork steerer tube is mounted. [1] On a motorcycle, the "head tube" is normally called the steering head . On bicycles the manufacturer's brand located on the head tube is known as a head badge .
These locomotives had 12-by-15-inch (305 mm × 381 mm) outside cylinders driving 3-foot-1-inch (0.940 m) wheels; all enclosed by skirting. They were the first locomotives on the Great Eastern to use Walschaerts valve gear. [2] They were used on the Wisbech and Upwell Tramway and the ports of Great Yarmouth and Ipswich from the 1930s to the 1950s.
Valves stop (or regulate) the flow of liquids or gases. They are categorized by application, such as isolation, throttling, and non-return. Isolation valves temporarily disconnect part of a piping system to allow maintenance or repair, for example. Isolation valves are typically left in either a fully open or closed position.
Designed by George Hughes, chief mechanical engineer of the LMS, and built at the ex-L&YR works at Horwich and the ex-LNWR works at Crewe.The inspiration came from a Caledonian Railway 2-6-0 design at the grouping, however the cylinders were too large for the LMS's English section's loading gauge, resulting in Hughes having to adapt the concept. [3]
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