HTD 453-5M, 15mm wide, not sure about length.
All the belts I have either came with my Lacroix or were given to me by a friend who purchased gear drives.
Just yesterday I switched a belt because it had a tear at the side, i regularly get small stones stuck in the belts or they get squished into the motor pulleys.
Regular maintenance is always checking the belts, checking tension and screw tightness.
I always take tools and replacement belts on a ride because sometimes they break during a ride so I can make roadside repairs.
Too bad I have to take the wheel off every time.
I’ve broken many 12mm belts and a few 15mm ones. Motor pulley 15T, wheel pulley 36 or 40. Sometimes with idlers, sometimes without. Sometimes single drive, sometimes dual. HTD 5M ofc.
I want to believe that the people who claim they never break belts just don’t ride hard. But quality does differ from manufacturer to manufacturer, so who knows
Do you have a favorite store you buy them from? I used to buy from beltingonline but they seem to mix & match the manufacturer you get; it’s not always strongbelt
Fun fact, Gates headquarters is still here in Denver, (engineering and research), but they closed the manufacturing plant here 30 years ago. They finally tore the building down around 7-8 years ago.
They were the largest employer in Denver in the 50’s and 60’s