- retread
- rev
- rigid
- rigid axle
- reverse clutch
- rib
- rev up
- rich
- resonator
- retarded
- retractable wheels
- rim
- rim designation
- rim diameter
- rim flange
- rim ridge
- rim size
- rim type
- rim width
- ring belt
- ring bolt
- ring expander
- ring gap
- ring gear
- ring spanner
- reversing light
- revs
- ride
- road adhesion
- road clearance
- road hog
- road noise
- road resistance
- road speed
- road tax
- road tractor
- road train
- roadster
- robot spraying
- rocker arm
- rocker box
- rocker cover
- rocker shaft
- roll bar
- roll oversteer
- roll test
- roll understeer
- roller bearing
- roller cage
- roller chain
- roller tappet
- rolling radius
- roof brace
- roof rail
- roller
- roller shaft
- rotary pump
- rotoflex coupling
- rough
- rolling resistance
- roo bar
- roof box
- roof drip
- roof headlining
- rotor
- rotor arm
- rotor cap
- rubber pad
- rubber tire
- rubbing block
- run channel
- run in
- rust protection
- rusting
- safety pad
- safety wheel
- rubber mallet
- rubbing compound
- run out
- runabout
- running gear
- running-in
- rust eater
- rust inspection
- rudge nut
- run
- run bearing
- running board
- rust sealer
- safety bonnet
- safety chains
- safety goggles
- safety hood
- roundabout
- route
- rubber coupling
- saloon
- salvage crane
- rust
- rust killer