Three numbers tell us everything we need.
If you have an old belt — even a broken one — the side carries everything we need to match it. Look for markings like "A 1306 Lp / A 50" or "B-90" or "SPA 1250".
The letter is the section (A, B, C, SPA, SPB, etc.).
The number is the inside or pitch length in inches (for classical) or millimeters (for wedge).
Don't have an old belt? No problem. Tell us the centre-to-centre distance between your two pulleys and the diameters of each — we'll calculate the belt for you.


