Use the Following Link to test the Download speed of your router. Results are in Kb/s.
http://www.dslreports.com/stest
The above link is not the only option for speed tests, so if admin want to add more, please do so below:-
http://www.broadbandreports.com/tools
http://www.adslguide.org.uk/tools/speedtest.asp
http://www.kbps.co.uk/
Flash based:
http://www.speedtest.net
http://www.mybroadbandspeed.co.uk