Bonetto Cinturini Rubber Strap Trimming Guide

Family-owned Bonetto Cinturini, based in Vicenza, Italy, has been making rubber watch straps for more than forty years. Made in Italy from vulcanized nitrile (NBR) rubber, these straps are waterproof and resistant to saltwater and UV exposure. NBR rubber also tends to attract less dust and lint than silicone. Explore the full Bonetto Cinturini collection for other styles and colors.

Adjusting Your Strap to Fit

Bonetto Cinturini cut-to-size deployant straps can be shortened incrementally for a more precise fit.

Caution: Measure twice, cut once. Remove only a small section at a time to avoid cutting it too short. Cut straps cannot be returned or exchanged.

Step-by-Step Instructions

Bonetto Cinturini sizing instructions
Opening the deployant clasp to remove the strap piece.

1. Open the deployant clasp. Using a spring bar tool, small screwdriver, or similar tool, push through one of the three pinholes on the side of the clasp to disconnect the spring bar. Remove the strap piece from the clasp.

Bonetto Cinturini cutting instructions
Cutting a 6–7mm section of rubber from the strap piece.

2. Lay the strap piece on a flat surface. From the clasp end, carefully cut a 6–7mm section of rubber using a sharp kitchen or craft knife. Avoid cutting too close to the metal insert in the strap.

Bonetto Cinturini strap cut adjustment
Removing the metal insert after cutting the strap.

3. Tap out the metal insert closest to the newly cut edge using your spring bar tool or screwdriver. Insert the spring bar into this channel and discard the removed metal insert.

Reattach Bonetto Cinturini strap to deployant clasp
Reattaching the strap piece to the clasp.

4. Reattach the strap piece to the clasp and connect it to your watch.

5. If additional shortening is needed, repeat the process on the other strap piece, checking the fit after each adjustment.

6. Continue adjusting until you reach the desired length.

7. Use the three spring bar pinholes on the clasp for final fine adjustment.

Tips for Care and Longevity

  • Rinse your strap with fresh water after exposure to saltwater or sweat.
  • Avoid sharp tools near the strap outside of cutting for length adjustments.
  • Store in a cool, dry place when not in use to maintain elasticity.

Frequently Asked Questions

Can I return a strap that I’ve cut to size?

No, straps that have been cut cannot be returned or exchanged. Measure carefully and cut incrementally.

Can I adjust the strap multiple times?

Yes. You can repeat the process on each strap piece as needed, but always remove small sections and check the fit after each adjustment to avoid over-shortening.

How do I know which strap width fits my watch?

Choose a strap width that matches the distance between your watch's lugs. If you're unsure of the measurement, see our Strap Width Guide.