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Summit Stratos "12-Hour" Bibs Men's

Size & Fit Chart

OVERVIEW: This is the 12-Hour Bib™. Designed for ultra endurance races like the Cape EpicDirty Kanza, and Red Bull Trans-Siberian Extreme, the Summit Stratos took two years for our development team to perfect. Every seam, stitch and detail was meticulously engineered while collaborating with the world's finest chamois manufacturers at Cytech, to craft an endurance bib unlike any other. The Summit Stratos provides uninhibited movement, long distance comfort and body temp regulation during exertion through the heat dissipating Cerami-K body fabric, comfort-shaped MAB X Power straps and Cytech Endurance Anatomic Super Air chamois. Eight hours into your next epic adventure, with the sun blazing down while you're pushing against a 15% grade, you'll be happy you chose the Stratos.

Innovation!YOU GET TO CHOOSE! 

These bibs are available with Italian 4.5cm "STANDARD" or 7.5cm "LONG" MARC compression leg bands with ultra-soft Silicone grippers. 

James Kirk"I recently competed in and finished a very pleasing 24th in one of the world’s toughest endurance bike races, the Transcontinental Race (TCRN06), riding the entire race in a single set of Pactimo Summit Stratos 12-Hour Bibs and Ascent Aero Jersey. I knew the most critical part of my kit would be the clothing / saddle combination, but I can hand on heart tell you that I finished in Greece without a single saddle sore after riding over 320km per day for 12 days, through 14 countries, in what was a fierce European heatwave which saw temperatures frequently touch 40C. I’ve never felt the need to write to equipment providers before but I was so pleased with the results of the Pactimo kit I felt I had to share this with you." - James Kirk, 24th TCRN06

Read James' entire TCR story »

BikeRumor Summit Stratos Review"These are some of the best performing bibs I’ve worn. The feel is soft and they move well to the point of being hardly noticeable. The chamois does conform well to your body, staying in place and offer true all day comfort. For my long rides they were my go-to short and if you are really going out on a 12 hour ride, the Stratos would be a great choice." Read the review »

Road Cycling UK Summit Stratos ReviewRCUK included the Summit Stratos bibs in their list of 100 Hottest Products of 2018 saying, "Pactimo’s Summit Stratos bib shorts are among the very best we’ve tested. They are supremely comfortable. You hardly know you’re wearing them." Read the review »

Velo Buyer's Guide featuring Pactimo Summit Raptor Bibs"The Summit Stratos Bibs offer smart design features such as lay-flat, laser-cut bib straps and three-inch leg bands. For all-day grinds, we love these shorts."

FEATURES: Guaranteed to provide unparalleled comfort for 12-hour activities, the Stratos has been engineered with the one-of-a-kind Endurance Anatomic Super Air chamois, designed specifically to our demanding specifications. Built with all the same features you have come to love from the Endurance Anatomic 2 Carbon Flash chamois in our award winning Summit Raptor bibs, the new Anatomic Super Air is even lighter and more breathable.  Using our proven Silhouette Articulation, the Stratos shapes your body perfectly in the riding position. The Cerami-K body fabric with ceramic particles bonded to the exterior, provides temperature regulation through moisture transfer and heat dissipation. The ceramic bonded fabric also creates a new layer of protection against abrasion excessive wear and pilling.  We've also incorporated MAB X Power Collection Bib Straps and MARC compression leg bands to enhance light-weight and next-to-skin comfort of the Stratos bib.

Moral of the story, this is the bib you'll forget you're wearing!  


  • TotalFit™ with Cerami–K fabric
  • Cytech Endurance Anatomic Super Air men's chamois
  • 7.5cm or 4.5 cm MARC compression leg bands with ultra-soft Silicone grippers
  • MAB X Power Collection Bib Straps for maximum stretch and performance
  • Stretch binding
  • Designed with Silhouette™ Articulation
  • Flatlock stitching
  • 10.5" Inseam

Customer Reviews

Based on 407 reviews Write a review

SUMMIT COLLECTION: The Summit Collection is comprised of our premium-level clothing, engineered for the experienced, elite cyclist who demands only the best. Summit garments provide a superior fit, and feature the world’s finest fabrics, chamois and performance technology.

Lifetime Warranty - 100% Guaranteed

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Size & Fit Chart

If you are new to cycling, please be aware that cycling apparel is intended to fit tighter than most other athletic clothing.

If you have questions or need assistance, call 028 9073 0179 or email

NOTE: Not all garments are available in every size listed on the size chart.

Fit Guide


Items in this category have been designed to provide a relaxed fit.


Items in this category have been designed to provide a traditional form fit.


Items in this category have been designed to provide an aerodynamic form fit.

Second Skin Fit


Items in this category have been designed to provide an ultra form fit.

Fit Videos


Size Charts

Custom cycling clothing size chart example - man
Custom cycling clothing size chart
Custom cycling clothing size chart example - woman

Arm, Knee and Leg Warmer Sizes
Shoe Cover Size Chart

Custom cycling sock size chart

Cycling Glove Size Chart

Measuring Tips 


Using a soft measuring tape, bring the tape across your back under each arm, around the front. For women, measure the widest point of the bust. For men, measure around the largest part of your chest.


Bend to one side to find natural indentation in torso. This is your natural waist. Run tape around waistline, keeping tape parallel with floor. 


Stand on a level surface with feet together. Measure around fullest part of hips and bottom (approximately 7" - 9" below waistline), keeping tape parallel with floor.

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