The easiest way to tell if a internet bike shop is a scam is to look at what they are selling.
Bike brands such as Specialized, Trek, Giant & Cannondale don't allow their bikes to be sold on the internet.
http://lmgtfy.com/?q=indonesian+bike+shop+scams
If you check the prices in a legitimate Indonesian bike shop like
Rodalink and you'll see that they are comparable to prices in other shops around the world.
This was posted on another forum about Indonesian scam bike shops.
i run a bike shop in indonesia and have to tell you the truth the price in indonesia is not actually cheaper than overseas because of high import duty. we have lots of european or overseas walk in who say our price is high but that is a fact, i understand lots of people got scammed but before buying from bike shop in indonesia its better to check with the manufacturer on the status of the shop. we have identified a few shops especially those selling Eddy Merckx in Medan area, all of them are fraud.
short to say when the price is too good to be true usually its SCAMMED thus beware. i know there is only 1 bike shop in medan that sell premium brand but no more than that. the rest is just a normal mom n pop bike shop. it will have more in jakarta.
please check with the brand owner on the shop ask them to verify with their local distributor if the shop is real. its better right