Anyone give me a pointer where I can the rear bicycle racks. For a hatch back car. I thought they may have in Decathlon but they don't. Anyone know where?

You could try 888 bike shop on San Kamphaeng Rd, just east of middle ring road.

 

They have them on their website.

 

 

Decathlon has them, Have a look around or ask for it, Its at the bicycle section. La Bicycle at the moat also has them.

 

Good Luck