I have compiled a little visual index of all the different roadsters I came across while traveling in India: Bicyclopedia India. Overall there are 32 different brands...and those are just the ones that I saw in my short stint there.
Almost all originate in Ludhiana, India which must make it the roadster capital of the planet. Ludhiana is sometimes known as "The Manchester of India" because of it's industrial capacity. But these days, I'd wager the Punjabi city far exceeds Manchester in industrial output.
For future reference and convenience, I've also placed a link to the Bicyclopedia India over on the left-hand border. Enjoy.