blower pulley htd and gt

what is the differance between the 8mm htd pulley and the 8mm gt pulley?ready and looking to buy my pulleys and have seen both of these.can they be used togeather?or do i need to stay same on top and bottom..
i already have a new blower belt htd 1440-8mm..does this mean to use this belt then i'll need to use the htd blower pulleys?

 

JR at RBS has the answer, I'm old, I have forgotten

 

I believe the "GT belts" can be used on both type pulleys.
Since you already have a "non gt" belt you'll have to stick with the standard 8mm pulley's. I use 14mm stuff and bought GT belts from the start as they can be used on either of the 14mm pulleys,makes locating pulleys much easier!
Here's a link to explain in detail:

http://www.rcdengineering.com/belt1.html


Hope this helps

Jason.

 

thanks this was a help