Mass-start races were illegal in Britain for many years, a major reason for the popularity of time trials there. Mafac Parts from Harris Cyclery Mass start A race in which all the competitors start together at the same time, as opposed to time-trials or pursuits. 'MAFAC' is an acronym from: ' Manufacture Auvergnoise de Freins et Accessoires pour Cycle' (Manufacturer in the Auvergne of Brakes and Accessories for Cycles.) The Mafac 'Racer' centerpull was the standard for high-end French bikes all through the '50s and well into the '60s. Mafac Defunct French manufacturer primarily of brakes. 'Mag' wheels are heavier than spoked wheels, and the rims can't generally handle high tire pressures, but the wheels themselves are very strong and resilient, good for abusive riding applications. The term 'mag wheel' is just a slang term for any type of molded one-piece wheel. In the early days of BMX there were metal 'mags' made of pot metal, such as 'Lester Mags'.Īs far as I know, nobody has ever made bicycle wheels out of magnesium. In the bicycle world, especially the BMX and Freestyle realm, the term 'mag wheel' is used to refer to molded glass fiber-reinforced plastic wheels, typically with 3-6 molded'spokes' as opposed to traditional wire-spoked wheels. Mag Wheels Some high-performance automobiles have wheels made of cast magnesium, commonly known as 'mag wheels' for short. It should be adjusted for straight wrists when the hands are resting on the drops.

The bottom flat part of the ' drops' will normally be level, or slightly down at the rear. It is usually set at an angle such that the forward-bending section is tilted somewhat downward toward the front. When it has bent forward 90 degrees, it turns downward, and bends in a smooth, constant-radius curve approximately 160 degrees, then straightens out.

From the center, it goes straight out then bends forward in a gradual curve. Mæs The Maes bend is the most common type of drop handlebar. This style of racing was most associated with New York's Madison Square Garden, hence the name.

As one rider would relieve another, the stick would be passed from one to the other in a distinctive maneuver designed to transfer as much momentum as possible from the retiring rider to his relief. Each team would have a small stick, carried in the back pocket. Teams of riders would take turns riding and resting. Madison A type of track race, often running six days continuously. This can cause the rim to wear out from braking friction locally sooner than it otherwise would. There is a potential drawback to this type of rim, though: If the alignment of the two ends is less than perfect at the weld, the machining process can leave part of the sidewall thinner than it was designed to be. They give smooth braking even brand new, with no need for a break (brake) in period as with traditional rims.When building up the wheel, they can often be trued to greater accuracy than traditional rims.Rims with machined braking surfaces have two advantages: Other companies have copied parts of this process, using machining on both welded- and pinned-joint rims. Mavic uses a welded seam (not normally practical on a thin-walled hollow-section rim) and then, after the seam is welded, the rim is placed on a special lathe where the excess material from the sidewalls is machined away uniformly. These rims are made with an extrusion slightly wider than normal, with extra thickness on the braking surfaces. see my article ' Derailer, not Derailleur'). Mavic could expect a visit from the French Language Police any day now. The French version isn't all French: it's marketeerese - 'process' is English. Sometime in the 1990s, Mavic introduced its ' SUP ® ' rims ( Soudé Usine Process: “Factory Welded Process”. Generally, this goes away after a couple of hundred miles of use, as the brake shoes wear down the irregularity of the seam. When a brand-new rim is first used (with a rim brake), the brake may pulsate annoyingly. Excess welding material is commonly ground down too far, creating a slight hollow or the two ends of a pinned rim may be slightly out of alignment. The seam area is never exactly perfect there is commonly a very slight difference in width or alignment. (This part is sometimes called a 'biscuit.') The seam may be welded, or, in the case of a lightweight, hollow-section rim, it may be made by fitting a short metal pin into the hollow at each end. Machined Rim Sidewalls Aluminum rims are made as an extrusion, curved into a hoop and then connected together at the seam, usually opposite the valve hole. Opinions and value judgments are our own, unless otherwise notedĪdditions and corrections are most welcome.Ī - B - C - D - EF - G - H - IJKL - M - NO - PQ - R - S - T - UVWXYZ Up to previous page

Mongoose magnesium rims racing bike