The Timex Ironman 8-Lap Gray Shades is the Japan-limited digital watch identified by model number TW5M54500. Timex Japan lists a 39 mm resin case, 19 mm lug width, chronograph, timer, alarm and 100 m water resistance. There is no hands-on evidence here, so this is a guide to the official specifications and the details to confirm before buying—not a wear or performance review.
What is the Timex Ironman 8-Lap Gray Shades (TW5M54500)?
Timex Japan identifies the Gray Shades as a Japan-limited edition of the Ironman 8-Lap. Its product number, TW5M54500, is the clearest way to distinguish this specific colorway from other Ironman 8-Lap watches. The brand describes a layered gray treatment, with different shades across the parts and a metallic material around the LCD. See Timex Japan’s official product listing.
Timex Japan calls the reissue a faithful recreation of the original and says it was produced with the approval of original designer John T. Houlihan. That is the brand’s account of the design history, rather than an independently verified finding.
What are the official specifications?
The figures and functions below are from Timex Japan’s listing for TW5M54500; they are not measurements from an independent inspection.
#1 Best Overall
- Sport-Inspired Function: 24-hour chronograph with lap and split times plus month, day, and date calendar for everyday timing and organization
- Everyday Utility: Built-in alarm and 24-hour military time mode keep you on schedule around the clock
- Clear Readability: Green digital display with INDIGLO light-up dial ensures visibility in any light
- Polished Build: Silver-tone 34 mm resin case with acrylic lens offers durability and a sleek finish
- Comfort Fit: Silver-tone 18 mm stainless-steel expansion band fits wrists up to 8 inches for easy, slip-on wear
| Specification | Timex Japan listing |
|---|---|
| Case width | 39 mm |
| Case thickness | 11 mm |
| Lug width | 19 mm |
| Case and strap | Gray resin |
| Crystal | Acrylic |
| Display and movement | Digital display; quartz movement |
| Listed functions | Chronograph, timer and alarm |
| Water resistance | 100 m |
The listing provides the rating but does not establish guidance for a particular activity or condition. Consult the watch’s official instructions for use and care rather than inferring a specific use from the number alone.
What does “8-Lap” mean, and what is the history?
The name points to the watch’s lap-timing function. Timex Japan’s reissue article says the original Ironman 8-Lap launched in 1986 and reports that it sold 400,000 units in its first year. That sales total is Timex’s retrospective historical claim; it is not independently validated here. The same article describes the reissue line as retaining 8-lap timing and 10-atmosphere water resistance while adding INDIGLO night-light illumination. The Gray Shades product listing separately specifies 100 m water resistance.
Rank #2
- Blue Contrast Build: A 38mm blue and black resin case pairs with an adjustable 16mm strap for secure, everyday training wear
- Serious Performance: A 100-hour chronograph with 30-lap memory and a 24-hour countdown timer support training days, while three customizable alarms keep you on schedule
- Stay on Schedule: Two time zones and a full day, date and month calendar keep every plan on track wherever the day takes you
- Night-Ready Visibility: An acrylic lens and INDIGLO backlight keep the digital display easy to read after dark, day or night
- Built to Last: A Timex watch is designed for durability and everyday reliability; every piece reflects our commitment to quality without compromise
Read Timex Japan’s Ironman 8-Lap reissue history.
What should you check before buying?
- Confirm the model number. Look for TW5M54500, not just “Ironman 8-Lap” or “Gray Shades.” Timex Japan identifies this edition as Japan-limited; that does not establish whether a particular seller currently has stock or ships to your location.
- Verify the seller’s listing. Current price, availability, shipping region and return terms are not established by the official product page. Check them directly with the retailer before ordering.
- Check the module and instructions. Timex Japan says two time-and-date setting sequences may apply depending on the installed module, and that the module cannot be identified by appearance. Use instructions matched to the actual module rather than relying on a universal button sequence.
- Do not assume a replacement strap will fit. The listed 19 mm lug width does not confirm the strap-end shape or attachment method. Ask the seller or Timex about compatibility before buying a replacement.
Which manual and battery information applies?
Timex’s US and EU manual indexes list an Ironman 8-Lap Digital guide associated with model 746 and a CR2016 battery. Those index entries do not establish that TW5M54500 uses that module or battery. Confirm the module and consult its applicable instructions before purchasing a battery or attempting service.
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- Contrast Case Build: A 38mm gray and black resin case pairs with an adjustable 18mm strap for secure, everyday training wear
- Serious Performance: A 100-hour chronograph with 30-lap memory and a 24-hour countdown timer support training days, while three customizable alarms keep you on schedule
- Stay on Schedule: Two time zones and a full day, date and month calendar keep every plan on track wherever the day takes you
- Night-Ready Visibility: An acrylic lens and INDIGLO backlight keep the digital display easy to read after dark, day or night
- Built to Last: A Timex watch is designed for durability and everyday reliability; every piece reflects our commitment to quality without compromise
Timex US manual index · Timex EU manual index
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Is this a hands-on review?
No. The available information establishes Timex Japan’s product specifications and brand history, but it does not document personal wear, timing tests, visibility checks or other use. The dimensions and feature list can help identify the watch; they do not support conclusions about comfort, real-world accuracy or performance.
Quick Recap
Rank #4
- Gray Build: A 38mm gray resin case pairs with an adjustable 16mm strap for secure, everyday training wear day after day, year after year
- Serious Performance: A 100-hour chronograph with 30-lap memory and a 24-hour countdown timer support training days, while three customizable alarms keep you on schedule
- Stay on Schedule: Two time zones and a full day, date and month calendar keep every plan on track wherever the day takes you
- Night-Ready Visibility: An acrylic lens and INDIGLO backlight keep the digital display easy to read after dark, day or night
- Built to Last: A Timex watch is designed for durability and everyday reliability; every piece reflects our commitment to quality without compromise
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
