Castelli Insider bib shorts review

Is it time to stop recycling your old outdoor bibs for indoor cycling?

Castelli Insider bib shorts
(Image: © Josh Ross)

Cyclingnews Verdict

A high-quality bib that looks good, feels good, and sports a couple of little tweaks that make it great for indoor cycling


  • +

    Mesh leg endings

  • +

    High wear saddle contact area


  • -

    Radio pocket is unnecessary

  • -

    Main fabric is both heavy and overly transparent

You can trust Cyclingnews Our experts spend countless hours testing cycling tech and will always share honest, unbiased advice to help you choose. Find out more about how we test.

Indoor cycling is a large part of the fabric that weaves the modern cycling landscape together. In the same way that you wouldn't expect road cycling and gravel cycling to use the same equipment, it's unreasonable to expect that indoor and outdoor cycling use the same gear. Indoor cycling is a unique challenge with unique needs and some of the best companies have risen to that challenge. 

If you are looking for clothing specifically designed to cover the challenges of indoor cycling then Castelli has to be on your radar. We included multiple Castelli pieces in our guide to the best indoor cycling clothing because they are one of the few brands that have developed specific gear. The Castelli Insider bib shorts aren't a recycled design with new branding. They are a unique collection of Castelli technology targeting the needs of riding inside and we've put them to the test. After many hours of sweating through virtual landscapes seeing what they are like, we are ready to talk about them. If you feel like you are ready to stop recycling old bibs or using your best cycling shorts for your sweaty indoor rides, and instead step up to purpose-built gear, keep reading to see what we think of the Castelli effort. 

Thank you for reading 5 articles in the past 30 days*

Join now for unlimited access

Enjoy your first month for just £1 / $1 / €1

*Read any 5 articles for free in each 30-day period, this automatically resets

After your trial you will be billed £4.99 $7.99 €5.99 per month, cancel anytime. Or sign up for one year for just £49 $79 €59

Join now for unlimited access

Try your first month for just £1 / $1 / €1

Josh Ross

Josh hails from the Pacific Northwest of the United States but would prefer riding through the desert than the rain. He will happily talk for hours about the minutiae of cycling tech but also has an understanding that most people just want things to work. He is a road cyclist at heart and doesn't care much if those roads are paved, dirt, or digital. Although he rarely races, if you ask him to ride from sunrise to sunset the answer will be yes. Height: 5'9" Weight: 140 lb. Rides: Salsa Warbird, Cannondale CAAD9, Enve Melee, Look 795 Blade RS, Priority Continuum Onyx