Castelli Unlimited Endurance Bib Shorts: Long-Ride Gravel and Road Bibs (£159.95)
The Castelli Unlimited Endurance is a bib short built for long days in the saddle, with a seamless pad and mesh storage that most race-focused bibs leave out. We have not tested it ourselves. This page collects the listed features, the Tredz price and where it fits a triathlete’s long bike rides.
Available now: Castelli Unlimited Endurance Cycling Bib Shorts — £159.95 at Tredz (RRP £189), correct at time of writing, 3 October 2026.
What the manufacturer and retailers list
- Pad: retailer listings name it the Progetto X2 Air Seamless pad, a variable-density foam pad with no perimeter stitching.
- Fabric: listings name Giro3 Light material with four-way stretch, with flatlock seams and mesh bib straps.
- Storage: mesh pockets. Listings disagree on how many (one rear pocket on some, two side pockets plus a rear pocket on others), so check the product page for the version you are buying.
- Leg grip: a silicone dot grip, with a UPF 50+ rating quoted by one retailer.
- Weight and sizes: bike-magazin.de quotes 178 g in size L. Sizes run XS to 3XL on some listings.
Specs are taken from retailer listings and one German test magazine’s spec sheet (bike-magazin.de). We have not seen Castelli’s own page, so details can differ by season and size.
Where it fits a triathlete’s training
The points below are our reading of the listed specs, not test results.
- Long weekend rides. A seamless pad and mesh straps are aimed at rides measured in hours, which suits Ironman-distance bike volume.
- Carrying food. Pockets on a bib let you carry gels and bars without a jersey, useful on gravel or mixed-surface sessions.
- Not an aero race bib. It is an endurance bib. For race-day kit see our Castelli Free Aero Race S bib shorts review.
- Price. Tredz has it at £159.95 against an RRP of £189.
Where to buy
Tredz lists the Castelli Unlimited Endurance Cycling Bib Shorts at £159.95 at time of writing, and the link below goes to the same product page.
Related guides
See also our guide to the best cycling bib shorts for triathlon training and the Castelli Superleggera bib shorts review.
This article contains affiliate links. If you purchase through these links, we may earn a small commission at no extra cost to you. This helps support The Triathlete.
