Micro-Adjust CTS Deployant Clasp
Your Wrist Changes.
Your Fit Should Too.
The next evolution of our CTS Deployant Clasp — now with 6mm of tool-free, on-the-fly micro-adjustment. Built for the way you actually wear your watch.
What Is It
The Clasp That Moves With You
A tool-free micro-adjustment upgrade for your CTS Clasp. Fine-tune your fit on the fly — no tools, no removal. Compatible with all existing Delugs CTS Rubber Straps.
The Micro-Adjust CTS Deployant Clasp is the next iteration of our standard CTS Clasp — now with a tool-free micro-adjustment mechanism that lets you fine-tune your strap fit on the fly.
It deploys exactly like the standard clasp, is fully backwards compatible with all existing Delugs CTS Rubber Straps, and is built from the same 316L stainless steel. The only difference? Now your fit can change as your wrist does.
Developed over multiple years, refined through three prototype generations, and validated through a 1,000-repetition pull-push test — this is the most requested feature we've ever shipped.
Why It Exists
Your Wrist Isn't the Same Size
All Day Long.
Wrist circumference naturally fluctuates throughout the day — due to temperature, activity, hydration, and more. A strap that fits perfectly at 9am can feel noticeably different by 3pm. The Micro-Adjust clasp was built to close that gap.
Temperature & Climate
Warmer environments cause slight wrist expansion. Cooler air-conditioned spaces do the opposite. The difference can be 2–4mm across a single day.
Activity Level
Exercise, physical work, and even long periods of sitting all affect how your wrist feels in a strap. What's comfortable at rest may feel tight after a workout.
Sharing a Watch
If you and your partner share a watch, the standard notch system rarely lands on the same hole for both. Micro-adjust makes sharing seamless.
How It Works
Adjust in Seconds. No Tools. No Fuss.
The snap-fit mechanism is the same system used by Fitwell — our trusted micro-adjust buckle partner. It takes one firm tug to extend or shorten. That's it.
Size Your Strap First
Cut your CTS Rubber Strap to size as normal. Always set the clasp to its tightest position before finalising the cut — this gives you room to loosen later.
Attach the Clasp
Fit the Micro-Adjust clasp onto your CTS Strap using the included custom spring bars. It installs identically to the standard CTS Deployant Clasp — no new tools needed.
Adjust On the Fly
When your wrist changes, give the clasp a firm tug to extend or compress it. Each side adjusts by up to 3mm — 6mm total. No tools, no removal, no fuss.
Who It's For
Built for Anyone Who Wears a Watch All Day
If your wrist size ever changes — even slightly — you'll feel the difference.
Active & Busy Wearers
You wear your watch from morning meetings to evening workouts. Your wrist changes. The Micro-Adjust clasp keeps pace without requiring you to stop and fiddle.
Travellers & Frequent Flyers
Cabin pressure, climate changes, and long-haul flights all affect wrist size. Adjust your fit mid-flight with a simple tug.
Couples Who Share Watches
One watch, two wrists. The micro-adjust makes it easy to pass a watch between partners without resizing the strap — provided wrist sizes are reasonably close.
Understanding CTS
What Is a CTS Rubber Strap?
CTS (Cut to Size) rubber straps ship as one length — you trim to your exact wrist size. Available as universal or integrated styles. The Micro-Adjust clasp fits all of them.
CTS stands for Cut to Size. Unlike traditional straps that come in fixed lengths (S/M/L), a CTS Rubber Strap ships as one length. You trim it to your exact wrist size for a perfect, personalised fit — no extra holes, no excess strap material.
Delugs CTS Rubber Straps come in two styles. Universal CTS straps — like Waffle, Tropical, and Regular Rubber — have straight ends that fit any watch with a matching lug width. Integrated CTS straps have lug ends precision-molded to a specific watch case, creating a seamless factory-fitted look.
Both styles use the same tapered profile and deployant clasp system. The Micro-Adjust clasp is compatible with all Delugs CTS Rubber Straps — universal and integrated alike.
Shop by Brand
CTS Rubber Straps for Every Watch
We make CTS Rubber Straps for all of these brands — and many more. Every strap is compatible with the Micro-Adjust Clasp.
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Don't see your watch? Use our Strap Finder — we support 7,400+ models across 100+ brands.
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Get the Full Setup
Buy the clasp on its own to upgrade your existing CTS Strap, or get the complete bundle with a new CTS Rubber Strap.
Micro-Adjust CTS Deployant Clasp
For existing CTS Rubber Strap owners. Choose your clasp width (the tapered end — not the lug width) and colour. Backwards compatible with all Delugs CTS Rubber Straps.
CTS Rubber Strap + Micro-Adjust Clasp
The complete setup. Choose your watch model, strap colour, clasp colour, and clasp width. Everything you need for a seamless, custom-fit rubber strap experience.
Colours & Sizing
Four Finishes. Three Widths.
Available in 316L stainless steel across four colour treatments. Match your watch hardware or mix for contrast.
The Story Behind It
Years in the Making. Dozens of Iterations. One Clasp.
Micro-adjustment isn't a new concept — but getting it right on a deployant clasp, without tools, with enough force to be secure but not so much that it's frustrating, took three major design generations and dozens of refinements in between.
Sliding Caddy System
Our first approach used a sliding caddy mechanism. It worked in testing but proved unsustainable from a manufacturing perspective — tolerances were too tight to produce consistently.
Snap-Fit Exploration
We pivoted to a snap-fit system, which required the development of custom spring bars. The mechanism worked, but the force calibration needed refinement.
Final Design
Two small "humps" were added to the spring bar path, improving the tactile feel of each adjustment position. Actuation force was tuned to prevent accidental triggers. 1,000-rep pull-push test passed.
Built to Last
Tested for a Lifetime of Daily Wear
Validated through a 1,000-repetition pull-push test. The mechanism held. The tension stayed consistent. The click remained satisfying from rep 1 to rep 1,000.
A micro-adjustment mechanism is only as good as its longevity. A clasp that loosens over time — one that gradually loses its click, its tension, its security — defeats the purpose entirely.
We know this. So before this clasp shipped, we put it through a 1,000-repetition pull-push test: the equivalent of adjusting your fit twice a day, every day, for well over a year. The mechanism held. The tension stayed consistent. The click remained satisfying from rep 1 to rep 1,000.
The snap-fit system uses two precision-machined "humps" in the spring bar path to create resistance at each adjustment position. The actuation force was calibrated to be firm enough to prevent accidental opening — but smooth enough to adjust with one hand, on the wrist, without looking.
Read More
Go Deeper
Two articles covering everything you need to know about the Micro-Adjust CTS Deployant Clasp.
Micro-Adjust CTS Deployant Clasp — Our Most Convenient Clasp Just Got Better
The full story behind the launch: what the Micro-Adjust clasp is, why we built it, who it's for, and how it compares to other micro-adjust solutions on the market. A good starting point for anyone new to the product.
Read the article →Design Considerations, Testing Tolerances & Engineering Behind the Snap-Fit System
A detailed look at the engineering decisions that shaped the final design — including prototype iterations, force calibration methodology, the 1,000-rep pull-push test, and the Fitwell collaboration that informed the snap-fit mechanism.
Read the technical article →Shop
Two Ways to Upgrade.
USD 70.00 (reg. USD 80.00)
The Micro-Adjust CTS Deployant Clasp on its own. Compatible with all existing Delugs CTS Rubber Straps.
From USD 160.00 (reg. USD 170.00)
The complete setup. Any Delugs CTS Rubber Strap with the Micro-Adjust Clasp included.
Lifetime Warranty
Every strap and clasp, forever
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FAQ
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Not finding your answer? Our team is online 24/7 — chat with us and we'll help you pick the right clasp in minutes.
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