Adhesives

Aluminium

Ball & Socket Joints

Batteries
Battery Chargers

 Bearings

Belts (Drive)

Belt Pulleys

Brakes

Chain (Roller)
Chain Sprockets

Drill Bits

Electric Motors

Motor Speed Controllers

Electric Cables Switches etc
Fasteners

Gears

Hose Clips

Screw Taps & Dies

Shaft Clamps & Couplings

Springs

Steel

Timber
Hand & Bench Tools

Wheels

Miscellaneous Links

Electric Drive Motors - For small electric vehicle projects you are probably looking for DC Permanent Magnet drive motors with operating voltages in the 24 to 48V range and 250W to 1.2kW power range. If you can get them Unite motors are often one of the least expensive options and are specifically designed for vehicle traction duties. Otherwise wheel chair motors or other industrial DC motors may be of use. (US builders have a much better range of sources available to them than UK builders)

Electric Motors
(DC PM)

Technobots  Some Unite MY Series motors available.

PetrolScooter UK

  It is also worth checking eBay for scooter motors.

Active-Robots for powerful Magmotors and smaller robot gearmotors

For Unite motors imported from US try TNCScooters - can be a surprisingly inexpensive option if you can wait a couple of weeks!

Try also Ebay imports from US sellers

PartsForScooters

The RobotMarketPlace

TNCScooters

SDScooters

EVParts.com
NPCRobotics
ScooterSupport.com
Rad2go.com
SurplusCenter (large range of other items also)
Electric Vehicles USA

ElectricScooterParts.com

Try Also Ebay

MonsterScooterParts