u just need to know ur stuff before going to tek ming (or any workshop for that matter)

i just recently changed my tires in tek ming and it was ok la...they didnt try to do any funny funny stuff except ask me to change my tire valves (except that my valves are still new and theyre the steel type)

EVERYTHING is chargeable la....even the tire valves...if they want..they can even charge u for the valve caps..

but most of the time the rubber tire valves are free la. especially when u buy rims...

but whether free or not depends on what ur doing la...if u buy tires of course most of the time balancing is free....but if out of the blue u come and just wanna do balancing and nothing else of course they charge.