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BTwin Aerofit Cycling Bib Shorts



Pro-level bib shorts at a superb price, which they achieve without compromise

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

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BTwin continually manages to impress us with its products here at and these Aerofit Cycling Bib Shorts are no different. Ridden in the pro ranks by FDJ, these bibs offer a great fit, superb comfort, and just all-round excellence, all for a penny under 50 pounds. Astounding.

Doing this job you get to wear a lot of bib shorts; as soon as there is a glimpse of spring in the air your testing schedule becomes overrun with Lycra. Despite wearing all these different pairs, as soon as I put on the Aerofits I knew they were right up there. And that was before I took a gander at the price.

> Find your nearest Decathlon store here

> Buy these online here

One of the main reasons they instantly feel so good is the make up of the legs. The bottoms of the legs use a thicker material than the rest of the shorts, and has its threads running around the circumference to create a kind of band. Add a silicone gripper to the mix and this stops them moving.

I have large thighs, so I can find a lot of shorts quite restrictive, especially as time in the saddle increases. The Aerofits have an elasticated strip which runs vertically up the legs, interrupting that leg gripper; it's like an expansion joint, if you will, and means whatever size your upper leg, the shorts are compressive without being restrictive.

BTwin Aerofit Cycling Bib Shorts - back.jpg

Years ago, bib shorts were split into a few categories depending on how many panels they were made of – six, eight or ten – with the most usually providing more comfort and freedom of movement. It's not something you hear much of anymore, and shorts like the Aerofits are probably why – I got to about 20 before boredom set in, and probably explains why the BTwins fit like a glove.

BTwin Aerofit Cycling Bib Shorts.jpg

What about the pad – the heart of any pair of shorts? Well, it's a big old chamois to be fair, but that doesn't mean you get a lot of bunching or anything, regardless of the size of your saddle. The main section is made up of six pads, split by channels – three each side and symmetrical, each of the same density, but the rear section of the pad being slightly thicker than the front.

What this all adds up to is a chamois that is supportive and comfortable without being overly squidgy or feeling like there is any excess material. You even get some ventilation holes in the central channels which keep you cool too.

Moving on up, the bib straps are pretty minimalistic, with wide, flat, over the shoulder loops, which means you don't get any fabric cutting in or pressure points.

BTwin Aerofit Cycling Bib Shorts - straps front.jpg

A nod to their professional association is the radio pocket at the rear, which us unpaid weekend warriors can use for a debit card, cash or an mp3 player.

BTwin Aerofit Cycling Bib Shorts - straps back.jpg

Value can be a tricky subject, but I'd love to meet someone who wears these and doesn't think their money has been well spent. When you look at the quality of materials, construction, fit, performance and comfort, the Aerofits are hard to beat at any price, let alone just 50 quid.

> Check out our guide to the best bib shorts

I tested the dhb Aerons a few weeks ago, which are phenomenal shorts, but the BTwins step things up a notch when you consider they are £15 cheaper at RRP. In fact, even at the discounted price of the Aerons I'd still plump for the Aerofits. Overall, they are very hard to beat from any angle.


Pro-level bib shorts at a superb price, which they achieve without compromise

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Make and model: BTwin Aerofit Cycling Bib Shorts

Size tested: Large

Tell us what the product is for, and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

The simple explanation from Decathlon is, "These men's cycling shorts are used by the FDJ cycling team pros. Optimal comfort guaranteed. Stretch bib to hold the shorts in place, elasticated strips around the thigh hem."

This somewhat under sells them in my opinion – they are a brilliant pair of shorts, made even better by the fact that they are only 50 quid.

Tell us some more about the technical aspects of the product?

BTwin keeps things simple:


Ergonomic pad with gel inserts and 3 density levels for added comfort.


Excellent perspiration wicking thanks to the technical fabric.


Ergonomic cut. Elastic at the thigh hem.

Ultra-lightweight bib. Very slim fit.


Large pad, quick drying.

Rate the product for quality of construction:

Feel well put together and finished.

Rate the product for performance:

Excellent fit and near perfect lightweight racing performance.

Rate the product for durability:

Hardwearing stitching and material.

Rate the product for fit:

As far as a pair of full-on racing shorts go these are excellent – I've not felt much better. Thin, compressive and great proportions.

Rate the product for sizing:

Spot on.

Rate the product for weight:

A bit heavier than the excellent dhb Aerons but not so much that you'd notice.

Rate the product for comfort:

I could ride in these for hours and hours.

Rate the product for value:

£49.99 for pro-level bib shorts.

How easy is the product to care for? How did it respond to being washed?

Like most, a simple 30 degree wash. A few mud spray marks didn't wash off the blue band at that temperature.

Tell us how the product performed overall when used for its designed purpose

I love them. Excellent fitting, quality bib shorts.

Tell us what you particularly liked about the product

The fit.

Tell us what you particularly disliked about the product


Did you enjoy using the product? Yes

Would you consider buying the product? Absolutely!

Would you recommend the product to a friend? Yes

Use this box to explain your score

An absolutely brilliant pair of bib shorts, pure and simple. Everything from the fit and the material to the performance has been considered and then made to work at this price point. Brilliant. If they were £70 or £80 I'd give them a 9, but for less than £50? It has to be full marks.

Overall rating: 10/10

About the tester

Age: 37  Height: 180cm  Weight: 76kg

I usually ride: This month's test bike  My best bike is: Mason Definition

I've been riding for: 10-20 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: time trialling, commuting, club rides, sportives, fixed/singlespeed

With 20 years of road cycling and over 150,000 miles in his legs it's safe to say Stu is happiest when on the bike whatever the weather. Since writing his first review for back in 2009 he has also had a career in engineering including 3D-CAD design and product development, so has a real passion for all of the latest technology coming through in the industry but is also a sucker for a classic steel frame, skinny tyres, rim brakes and a damn good paintjob.
His fascination with gravel bikes is getting out of control too!

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