Trying out a 175 down from a 180. Do I need a new belt or will the 180 belt work?

Our tensioners have a lot of travel so I would guess the same belt could be used...I'm not sure though.

I'm running a new Eurocharged 172mm and the K080514HD was a fairly tight fit but I know the same belt works with the 180mm pulleys.

Thank you for the quick replies..

I run a 180mm pulley with a 514HD belt.

I run the 514hd also with the 180mm pulley but I've destroy them and also destroyed my tensioner because it has very little play left. So after doing some research if you are running the plenum spacers which I am, it is better to actually run the 525hd which is slightly longer.