- Rib
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- The continuous raised portions of rubber that run circumferentially (straight or in a zigzag pattern) making up the tread on the tire. Also the term applies to various raised surfaces circling the sidewall, i.e., guide rib.
- A structural member for reinforcing bodywork.
- Ribbed Neck Carriage Bolt
- A plain, circular, oval head bolt with a serrated neck to prevent rotation.
- Ribbing
-
- A series of raised portions in castings or moldings to increase rigidity.
- A narrow recess stamped into relatively flat body panels, e.g., floorpans, that helps to reinforce the panel and to suppress vibrations in it.
- Ribbon silicon
- Crystalline silicon that is used in photovoltaic cells. Ribbon silicon is fabricated by a variety of solidification (crystallization) methods that withdraw thin silicon sheets from pools of relatively pure molten silicon.
- Ricardo principle
- An arrangement in which a portion of the combustion chamber came in very close contact with the Piston head. The other portion, off to one side, contained more space. As the piston neared TDC on the compression stroke, the fuel mixture was squeezed tightly between the piston and head thus causing the mixture to squirt outward into the larger area in a very turbulent manner. This produced a superior mixture and allowed Compression ratios to be raised without Detonation.
- Rich mixture
- A mixture of air and fuel in which there is less air and more fuel. The opposite is lean mixture. A slightly rich mixture generates the maximum achievable engine power, an overly rich mixture causes spark plug fouling, loss of engine power, and excessive fuel consumption. Any rich mixture increases exhaust emissions.
- Ride
- The degree of comfort, especially with regard to the suspension, experienced by the passengers.
- Ride height
- A measurement between the ground and some fixed reference point on a car's body. The exact location of the fixed point varies among manufacturers. This dimension can be used to measure the amount of suspension deflection or the height of the body from the ground. See
- Rider
-
- A person who operates a motorcycle.
- A passenger (but generally not the driver) of a car or truck.
- A vehicle.
- A clause in a contract
See
- Ride steer
- A generally undesirable condition in which a wheel steers slightly as its suspension compresses or extends. Also called bump steer.
- Ridge
-
- An edge, ledge, or lip which protrudes beyond the normal face of an object.
- The cutting edge of a screw thread above the flanks.
- A Hump.
- Riding the clutch
- A situation where the driver rests his foot on the Clutch pedal while the vehicle is being driven. This action can cause undue wear on the clutch plates because they may be rubbing against each other ever so slightly.
- Right
- When referring to the side of a unit, the right side is always from the perspective of operation. In other words, when sitting in the driver's seat or when riding a bicycle or when pushing a mower, the right side is the operator's right hand side. In other words the left or right side is determined by facing the rear of the unit.
- Right-hand drive
- (RHD) A steering system in which the steering wheel is located on the right-hand side of the vehicle; used for driving on the left, as in the UK, Japan, Australia, etc. The opposite is Left-hand drive.
- Right-hand thread
-
- The common direction (clockwise) which is used to secure a nut to a bolt.
- A thread is a right hand thread if, when viewed axially, it winds in a clockwise and receding direction.
See
- Right hand turn signal
- A device which is attached to the turn signal lever on the left side of the steering wheel to allow disabled people to operate the turn signals from the right side.
Right Hand Turn Signal
- Right-of-way
- (ROW) Land, property or property interest, usually in a strip, acquired for or devoted to transportation or other public works purposes. Includes the roadbed, ditches, road slopes, back slopes, bridges, trestles, or other structures, acquired for or devoted to transportation purposes. This does not include recreational or nature trails except where they intersect with or are located within road rights-of-way.
- Right turn sign
- A traffic sign indicating that the road makes a sharp turn to the right
Right turn sign
- Rigid axle
- A simple non-independent suspension, consisting of a rigid transverse member with wheel hubs solidly bolted to it. The axle can be attached to the body by Leaf springs, or by a combination of suspension arms and links. A rear axle which may be either live (in rearwheel drive cars) or dead (in front-wheel drive cars).
- Riley
- An automobile manufactured by British Leyland. The 1925-1948 models with required application are classic cars. The 1945-55 2.5 (RMA, RME) models are milestone cars.
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Riley
- Rim
-
- The outer edge of a dented area in a body panel that is heat shrunk towards the center of the dent.
- On a bicycle, the metal or wooden hoop of a wheel that holds the tire and tube and the outer ends of the spokes.
- On a truck, the metal assembly consisting of a base and either a side ring or a side and lock ring combination, which are removable from one side for tire mounting. The opposite side has a fixed flange to retain the tire. Note Passenger and tubeless rims do not have removable side and lock rings.
See- AH rim
- Asymmetric rim
- Clincher Rims
- Curing Rim
- DC rim
- Demountable rim
- Detachable rim
- Drop center rim
- Drop center rim taper
- Flat base rim
- Flat base rim taper
- High center rim
- Horn rim steering wheel
- Hump rim
- Intermediate rim taper
- Multi-piece rim
- Nominal rim diameter
- Nominal rim width
- One-piece rim
- One-piece rim designation
- Overall rim diameter
- Safety rim
- Semi-drop center rim
- Single-piece rim
- Split rim
- Standard rim
- Symmetric rim
- TD rim
- TR rim
- Well-base rim
- Wheel rim
- Wheel trim rim
- RIM
- Abbreviation for Reaction injection molding.
- Rim bead seat
- The portion of the wheel rim below the rim flange providing radial support to the bead of the tire.
- Rim bead seat taper
- The narrowing of the rim width towards the rim well. The taper must be designed to lock the tire to the rim and provide a good seal; well-base rims for passenger cars have a 5° taper, those for commercial vehicles have a 15° taper; flat base rims for commercial vehicles have no taper.
- Rim brake
- Any type of brake that slows or stops a wheel by pressing its pads against the sides of the wheel Rim.
- Rim designation
- The nominal rim diameter, nominal rim width and any abbreviations and codes for the contour of the rim.
- Rim diameter
- The distance between the intersection of the bead seats and the vertical walls of the rim flanges.
- Rim drivers
- Riveted or welded metal blocks or extrusions on both sides of the valve slot to prevent valve damage due to rim slippage on cast spokes.
- Rim flange
- The part of a rim that supports the tire bead in a lateral direction; the linear distance between the two rim flanges is termed rim width.
- Rim offset
- A measurement in inches from the center of the rim (between the flanges) to the tip of the 28° gutter bevel.
- Rim pull
- Actual amount of effort in pounds available at the point of contact of tire and road surface.
- Rim ridge
- See
- Hump.
- Rim size
- The dimension of a wheel covering the rim width and rim diameter and is measured in inches.
- Rim strip
- A thin, narrow strip of material (usually rubber or cloth) placed around the outside of a rim (beneath the tube) to cover the sharp edges of the spoke which might protrude beyond the nipple. See
- Rim tape
- A rubber strap which covers the spoke nipples on the inside of the rim to protect the spoke from poking into the tube.
- Rim type
- Depending on the type of tire, rim types differ according to the rim profile and the number of rim parts. Compare Multi-piece rim, One-piece rim, and Safety rim.
- Rim well
- The portion of the rim with a substantially smaller diameter than the bead seats and located with sufficient depth and width to enable the tire beads to be forced over the mounting side of the rim flange and bead seat taper for installation or removal.
- Rim well base
- The portion of the rim with a substantially smaller diameter than the bead seats and located with sufficient depth and width to enable the tire beads to be forced over the mounting side of the rim flange and bead seat taper for installation or removal.
- Rim width
- The nominal distance between the rim flanges. The width of a rim is an important factor in the handling characteristics of a car a rim that is too narrow in relation to the tire width will cause the tire to distort sideways under fast cornering. Unduly wide rims on an ordinary car tend to give a rather harsh ride because the sidewalls of the tire have insufficient curvature to make them flex properly over irregularities in the road. See
- Ring
- A circular piece or band of metal. See
- Audi Rings
- Balk ring
- Center Ring
- chainring
- Chrome ring
- Compression ring
- D-ring
- Dykes ring
- External Snap Ring
- Fire ring
- Flywheel ring gear
- Fulcrum ring
- Grooved compression ring
- Heavy-duty ring wrench
- Hog Ring
- Horn ring
- Internal Snap Ring
- Junk Ring
- L-section ring
- Lockring
- Lock ring pliers
- Molybdenum piston ring
- Moly ring
- O-ring
- Oil control ring
- Oil ring
- Pinned piston ring
- Pinned ring
- piston ring
- Piston ring clamp
- Piston ring end gap
- Piston ring expander
- Piston ring flutter
- Piston ring groove cleaner
- Piston ring groove
- Piston ring job
- Piston ring pliers
- Piston ring ridge
- Piston ring side clearance
- Piston ring stop
- Rectangular-section ring
- Ring and pinion
- Ringbolt
- Ring gear
- Rotating seal ring
- Scraper ring
- Side ring
- Slip ring
- Snap ring
- Tapered compression ring
- Tone Ring
- TRUARC® retaining ring
- Valve seat ring
- Wear ring
- Whitewall Rings
- Ring and pinion
- A term used to describe the differential Drive pinion and Ring gear.
Ring and Pinion
- Ringbolt
- An iron bolt having a ring through an eye at one end, through which a rope can be passed and tied.
- Ring gear
-
Ring Gear
- The large bevel, circular gear which is attached to the Flange or Carrier of the Differential case. It meshes with the Drive pinion on the end of the Propeller shaft.
- The outer gear in a Planetary gearset.
- Annular gear.
- A toothed rim of a flywheel which engages the pinion of the starter motor.
- Ring joint
- The connection of compression rings in a cylinder: Angle joint, Butt joint, or Lap joint.
- Ring spanner
- A British term for a Box wrench.
- Ripple current
- The undesirable AC (ripple) component of a pulsating DC current produced by a rectifier or similar power conditioning device.
- Riprap
- Erosion resistant cover material (including rock or large aggregate) for protecting slopes, basins, streambanks, bridge abutments, or other erodible sites from runoff or wave action.
- Riser bars
- A mountain bike handlebar that features an upward sweep providing a more upright riding position and greater stability.
- Rising rate
- A suspension system that becomes harder to compress the farther it is compressed. This is usually achieved by a mechanical linkage with variable leverage ratio.
- Rising-rate suspension
- A Suspension system where the spring rate increases when the wheels move further into Jounce. This action can be accomplished by configuring the geometric shape of the suspension, by using springs which change tension as they are compressed, or by using two or more springs with rubber stops. The purpose of a rising-rate suspension is to maintain consistent ride and handling characteristics under a variety of situations loaded or unloaded, straight roads or curves, and smooth roads or bumpy.
- Rivet
-
- A metal pin used to hold two objects together. One end of the pin has a head and the other end must be set or Peened over to create another head
- A semipermanent fastener used to hold two pieces together.
- A headed metal fastener of some malleable material used to join parts, as metal plates, of structures and machines by inserting the shank through a hole in each piece and forming a head on the headless end.
- Rivet Bolt
- A bolt designed as a substitute for rivets, having a button head, a ribbed shank, a UNC thread, or a special thread such as a Dardalet thread or Lok-ThreadTM
- Riveted brake lining
- A brake shoe that is attached to the backing plate with rivets rather than glued on.
- Riveted linings
- Brake linings that are riveted to the pad backing plate or brake shoe with copper or aluminum rivets.
- Riveter
- A tool with pliers-like handles and nose piece to insert rivets. It is used, for example, in body repair work to rivet sheet metal material together.
- Rivet gun
- A tool with pliers-like handles and nose piece to insert rivets. It is used, for example, in body repair work to rivet sheet metal material together.
- Riviera
- A model name of several generations of automobile manufactured by Buick division of General Motors (1949-50, 1963-65, 1966-70, 1971-73, 1974-76, 1977-78, 1979-85, 1986-93, 1995-1999). The Riviera for 1949 and 1963-70 are milestone cars. Buick also used the name for concept cars.
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Buick Riviera
- Rivnut
- A one-piece internally threaded and counterbored tubular aluminum rivet that can be pulled up or headed while working entirely from one side, forming a bulge or head on the blind side. This upset is large enough to resist being pulled through metal or plastic even under conditions of eccentric load. It overcomes the difficulty of installing brackets, handles or other attachments to tubular pieces.
Rivnut