B78 / 1981 Optibelt VB V-Belt
- 17mm wide
- 11mm deep
- 1981mm inside length
B78 / 1981 Optibelt VB V-Belt is backordered and will ship as soon as it is back in stock.
Measuring Your Belt
Measuring Your Belt
Check the markings first. Most belts have their size printed on the back, for example A24, SPZ1000 or 8PK1200. Type that code into the search bar to find the exact match.
Markings worn off? Measure across the top of the belt for the width, and its depth. For the length, wrap a piece of string round the belt, mark where it meets, then lay the string flat and measure it.
Timing or ribbed belt? Count the teeth or ribs, and measure the gap between them.
Full step-by-step guide: How to measure your belt →
Still not sure? Call 020 8138 2848 and we’ll identify it for you.
Delivery and Shipping
Delivery and Shipping
We ship across the UK and worldwide. Choose an economical service if you can wait a few days, or express if the machine is stood still until the belt arrives. Delivery costs are worked out at checkout based on the weight of your order and where it's going. More Shipping Information
B78 / 1981 Optibelt VB V-Belt
The Optibelt VB B78 is a B section classical V-belt, 17mm wide with a 78″ (1981mm) inside length. It’s made by Optibelt, our premier brand, for industrial motors, fans and air handling units, compressors and agricultural machinery.
Optibelt VB belts have a wrapped construction for smooth, quiet running and a long, consistent life, and they cope well with demanding agricultural drives and V-flat drives. They’re made to Optibelt’s S=C PLUS standard, so belts of the same size can be used together as a set without measuring and matching.
Specification
| Brand and range | Optibelt VB classical V-belt |
|---|---|
| Section | B |
| Top width | 17mm |
| Height | 11mm |
| Inside length (Li) | 1981mm (78″) |
| Construction | Wrapped, S=C PLUS |
Check it’s the right belt
- The old belt should be marked B78, or 17 x 1981 Li. The letter is the section and the number is the inside length in inches. Measure 17mm across the top and 11mm deep.
- If the markings have worn off, wrap a piece of string round the inside of the belt, mark it and measure the string. It should come to about 1981mm.
- If your belt isn’t 17mm wide, see our A section and C section belts.
Not quite the right length? The nearest sizes are B77 and B79, or see all B section belts. On drives with more than one belt, replace them all at once with belts of the same brand. Not sure? Call 020 8138 2848 and we’ll help you find the right belt.
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Construction
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Top width (mm)
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Height (mm)
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Inside length (mm)
Payment & Security
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