COROS Band Size Chart for Every Model

COROS band sizing is mostly a 20mm and 22mm quick-release story, which makes the exceptions easy to miss. The original Pace hangs its 20mm band on screw-mounted pins, not a spring bar. The Vertix 2 and 2S jumped to 26mm while the original Vertix stayed 22mm, a 4mm gap inside one family. The Nomad and the Apex 4 46mm sit at 24mm, a width almost nothing else in the lineup shares. And COROS itself labels the Vertix connectors "quick fit" while retailers sell ordinary quick-release bands for the same watches. The chart below gives the lug width and the connector for every model, because on a COROS either number can sink the order on its own.

COROS band size chart: all models, widths and connectors

Width is the lug width a replacement band must match. Source 1 for every row is COROS's official Watch Band Compatibility chart on its help center; each row is also checked against at least one independent retailer list, named in the Sources section. Where sources disagree, both positions are shown, never averaged.

* The starred rows are the ones where COROS's own paperwork is not internally consistent, and the width numbers need separating from the connector names. On width, every source agrees: Vertix 1 is 22mm and Vertix 2 and 2S are 26mm, confirmed by the official chart, nothingbutbands, and skiuphill.ca's 22mm and 26mm band pages alike. On the connector name, COROS's compatibility chart labels the Vertix 1 bands "22mm quick fit" in both its silicone and nylon tables, and its band-changing article says the Vertix works with "select 3rd party quick fit bands"; yet the same chart calls the Vertix 2/2S silicone band "26mm quick release" and the Vertix 2/2S nylon band "26mm quick fit". Retailers do not follow the split: skiuphill.ca sells one ordinary quick-release band line for Vertix 1 at 22mm and another for Vertix 2/2S at 26mm, and nothingbutbands describes the original Vertix as taking the same standard 22mm quick-release bands as the Pace 3. The honest read: buy by width from the chart, and treat "quick fit" as COROS's name for its own band line rather than a different lug standard.

One more chart quirk worth knowing: COROS's own band rows cross-list models freely. The "APEX 4 (42) Silicone Band" row lists Apex 4 42, Pace 3, Pace 4, Pace Pro, Apex 46, Apex Pro 1 and Apex 2 Pro as compatible, which is the manufacturer confirming that every 22mm quick-release COROS shares one band pool. On the 20mm side, the band-changing article states it outright: "PACE 2 bands are compatible with APEX 2 watch bands."

Connector traps: the four ways a COROS band order goes wrong

• Vertix 2 and Vertix 2S: 26mm, not 22mm. The expedition line doubled its width in one generation. The original 2019 Vertix is 22mm; the Vertix 2 and 2S are 26mm, and no band from the rest of the COROS range fits them. nothingbutbands flags exactly this ("The Vertix 2 and Vertix 2S both use 26mm bands, a different width from anything sold on this page"), skiuphill.ca stocks a separate 26mm quick-release band for them, and watchband.direct notes 26mm is much rarer in the third-party market than 20mm or 22mm, so filter listings by the exact width rather than by "COROS".
• Nomad and Apex 4 46mm: 24mm. These two share a width nothing else in the lineup uses. The official chart gives each its own 24mm band row, and nothingbutbands spells out the consequence: a 22mm band does not fit either, and only the Apex 4 42mm case takes the standard 22mm width. If your Apex 4 is the 46mm case, you are shopping in the 24mm aisle with the Nomad, not with the Pace 3.
• Pace 1: 20mm, but the pins are screwed in. The official chart's parenthetical is the whole trap: "20mm quick release (screw installation required for pins)". The Pace 1's band pins thread into the lugs rather than springing into them, and COROS's own instructions say Pace bands "require a replacement tool to be removed and changed", unscrew the band, move the hinge pin to the new band, secure. A third-party quick-release 20mm band can go on, but only after the screw-mount pins are dealt with, not with the fingernail-only swap the rest of the lineup enjoys. The Pace 1 is long discontinued, so check which Pace you own first: the Pace 2 looks similar and takes an ordinary 20mm quick-release band.
• Vertix 1: quick fit is the official label, quick-release is the market reality. See the starred chart footnote. COROS's paperwork never calls the Vertix 1 connector "quick release", it says "quick fit", which reads like a proprietary standard and scares buyers off ordinary 22mm bands. The retailer record contradicts the scare: standard 22mm quick-release bands are sold for and fitted to the original Vertix routinely. Disclosed divergence, not resolved: width 22mm is unanimous, the connector name is COROS's own inconsistency.

A non-trap worth naming: the Pace line's generational split is a plain width change, not a connector change. Pace 1 and Pace 2 are 20mm; Pace 3, Pace Pro and Pace 4 moved to 22mm. Same quick-release system on all of them (screws aside on the Pace 1), so the only thing a Pace 2 owner buying for a Pace 3, or vice versa, gets wrong is the width. nothingbutbands states a 20mm Pace 2 band will not fit any of the 22mm Paces.

The "not fully tested" caveat on third-party bands

COROS's official position on third-party bands is more reserved than its retailer ecosystem, and it varies by model. The band-changing article on the help center says of the Pace 3: "COROS PACE 3 silicone watch bands are 22mm wide and may be compatible with select 3rd party quick-release bands, though this has not been tested." The same article is firmer elsewhere: the Pace 2's bands are "compatible with select 3rd party quick-release bands" with no test disclaimer, and the Apex 42 gets the same firm phrasing. watchband.direct reads this correctly as conditional language: standard 22mm quick-release bands generally do fit the Pace 3, but COROS is not promising it, so check community feedback for your specific band before ordering. This page shows that caveat rather than laundering it into a blanket "all quick-release bands fit": the width column is confirmed, the third-party fit is COROS-untested.

How to change a band on each COROS connector

On the standard quick-release rows (every model except the starred ones), the swap is the industry-standard one: press the lever on the underside of the spring bar with a fingernail, slide the old band out, click the new band's bar into both lugs, tug to confirm. No tools. The full walkthrough, including what to do when the lever is stubborn, is in the spring bar tool guide. The nylon bands add a step COROS documents for the Pace 3 and later: one end attaches with the quick-release bar, the other end threads through a fixed bar and folds back on Velcro.

The Pace 1 is the one COROS that needs the screw procedure: separate the replacement tool (it ships inside the band holder, twist both ends apart), unscrew the old band, transfer the hinge pin to the new band, then secure the new band with the tool. If a third-party 20mm quick-release band is going on instead, the screw pins come out the same way and the quick-release bar drops into the vacated lug holes; keep the original screws and pins in case you revert. The spring bar sizes guide covers bar lengths and diameters if you are mixing pins from different vendors.

How to measure your COROS lug width if it is not listed

COROS's range is fully covered above, but regional variants and future releases will not be. The check takes a minute: release one end of the stock band (screw end on a Pace 1) and measure the gap between the inside faces of the two lugs with a ruler or calipers. That gap in millimeters is the width to buy. The full method, including curved-lug cases, is in the lug width chart. The other half of the purchase is length: a band of the right width still has to fit your wrist, and the wrist measuring guide plus the strap length chart settle that before you order.

Related guides

For the same treatment of other sport-watch lines, see the Garmin band size guide (QuickFit 20/22/26 quick-release kits, the closest cousin to COROS's width jumps), the Amazfit band size chart (the T-Rex screw-mount and 26mm traps mirror the COROS ones), the all-model Fitbit band size chart, the Suunto band size chart (the 9-versus-9-Peak width trap), the Galaxy Watch band size chart, and the Apple Watch band size guide. The pins these bands hang on are covered in the spring bar sizes guide and the spring bar tool guide; the general width system is in the watch band size chart and the lug width chart by brand, and whether the watch head itself suits your wrist is a separate question in smartwatch sizing.

Sources

• Every width row, the Pace 1 "screw installation required for pins" parenthetical, the 24mm Nomad and Apex 4 46mm assignments, the 26mm Vertix 2/2S assignment, and the quick-fit versus quick-release labeling: COROS's official Watch Band Compatibility chart, support.coros.com article 6512246577940 (updated January 2026), silicone and nylon tables.
• Pace 2 at 20mm, Pace 3 at 22mm with the verbatim "may be compatible with select 3rd party quick-release bands, though this has not been tested" caveat, Apex 42 at 20mm, Vertix at 22mm "quick fit", Nomad at 24mm quick-release, the Pace 2 / Apex 2 band interchange statement, and the nylon Velcro threading method: COROS help center article 360040250591, Changing Bands and Straps on COROS Devices.
• Pace 1 screw-tool swap procedure ("require a replacement tool", unscrew, hinge-pin transfer) and the Apex 42 at 20mm / Apex 46 at 22mm confirmations: COROS's own remove-and-change page, coros.com 1-6-opt_bands.php.
• Independent per-model width list corroborating every row (Pace 1 and Pace 2 at 20mm; Pace 3, Pace Pro, Pace 4 at 22mm; Apex 42 at 20mm; Apex 46 and Apex Pro at 22mm; Apex 2 at 20mm; Apex 2 Pro at 22mm; Apex 4 42mm at 22mm; Apex 4 46mm at 24mm; Vertix 1 at 22mm; Vertix 2/2S at 26mm; Nomad at 24mm), the Pace generational-split warning, and the "26mm, a different width from anything sold on this page" Vertix quote: nothingbutbands.com COROS collection and its COROS Pace 2 collection page.
• Independent retailer compatibility matrix (20mm: Pace 2, Apex 2, Apex 42; 22mm: Apex Pro, Apex Pro 2, Apex 46, Pace 3, Vertix; 26mm: Vertix 2/2S; plus the discontinued-Pace-1 note): skiuphill.ca COROS 20mm, 22mm, and 26mm watch band product pages.
• Apex 2 at 20mm as the most third-party-friendly COROS, Pace 3 at 22mm with the conditional not-fully-tested reading, and Vertix 2 at 26mm with the note that 26mm is rare in the third-party market: watchband.direct COROS watch bands guide.
• Chart-currency cross-check only, disclosed as a mirror and not counted as an independent source: fitness.net.nz's COROS band compatibility page reproduces the official silicone and nylon tables verbatim.