Can you use the stock belts with the UR crank pulley (3 layer, ps,alt,ac)?

 

I've never tried to use the stock belts but it looks as if you would run out of adjustment range to tighten them with the new pulley. UR's website and their instruction sheets lists belt sizes that will fit their pulley's different diameter and I found that the sizes seem to be pretty accurate and allow plenty of room for future adjustment as the belts stretch. I was able to pick up the Gates belts that I needed at a local store for around $10 a belt.