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Vel SL-O Carbon Cage



Secure bottle cage for weight weenies who are happy to pay the price

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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Good scores are more common than bad, because fortunately good products are more common than bad.

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There are few things in cycling that cost as much per gram as a carbon fibre bottle cage, but if you must have a drink retainer made of the black stuff then the Vel SL-O Carbon Cage is a smart choice. It's a sturdy, rattle-free solution to carrying your bidon.

  • Pros: Holds a bottle firmly, easy to get a bottle in and out
  • Cons: A bit pricey

I've had a lot of gravel/adventure bikes in for testing lately so the SL-O has been thoroughly put through its paces on the local rough gravel tracks and potholed bridleways. The fact it hasn't jettisoned a single bottle means it's passed the most important test of bottle retention.

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The carbon arms offer a firm grasp, which when paired with the curved top and bottom lips means that your bottle is held from all angles and isn't going to go anywhere whether it is full or empty.

The cage uses an open design (that's what the 'O' stands for – open) with the arms not joining in the middle, allowing you to remove and fit the bottle without hassle as the arms spread a little when you put the bidon at an angle.


You have to be quite precise lining up the bottle to put it in to start with, but once you've got used to it it's easy.

SL means Super Light, with the Vel weighing in at 20g on the Scales of Truth; that's 4g less than that quoted on Vel's own website so it'll definitely impress the weight weenies.

Saying that, it's only 8g lighter than Vel's T5 SL alloy cage, which costs just £17.99, or 14g lighter than its Race Cage for £11.99.

It is impressive that this carbon offering can offer such high levels of retention for such a small amount of material though.

Overall build quality can't be knocked either. It doesn't feel flimsy and the carbon feels to be good quality. It's full carbon, too, not a nylon/carbon composite mix like some of the cheaper cages on the market.


If you're looking for a carbon cage then value for money probably isn't a major priority, but we'll take a look anyway. The Vel is priced at £44.99 which when you look at something like the Elite Vico carbon cage at £24.99 is quite high, even if the Elite only really works with the company's own bottles.

> Read more reviews of bottle cages here

Both Zefal's Pulse and Hoy's carbon cages are priced at £34.99 for similar weight items.

Overall, if you want some bling and only carbon will do then the Vel is a smart looking, top performing, lightweight bottle cage provided you're willing to pay for it.


Secure bottle cage for weight weenies who are happy to pay the price test report

Make and model: Vel SL-O Carbon Cage

Size tested: One

Tell us what the product is for

The Vel SL-O bottle cage is designed to suit all bottle sizes and offer retention on a mix of terrains.

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

From Vel:

SL-O Carbon Cage (Super Light – Open)

Open cage design

Full carbon construction with brushed unidirectional carbon finish and white VEL with logos

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for weight (if applicable)
Rate the product for value:

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

Exit and entry is easy plus it holds the bottle secure.

Tell us what you particularly liked about the product

Bottle fit.

Tell us what you particularly disliked about the product


Did you enjoy using the product? Yes

Would you consider buying the product? Yes, if I could find it cheap enough.

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

100% carbon fibre cages are notoriously expensive and the Vel is no exception. Offsetting that, though, is impressive bottle retention and ease of use.

Overall rating: 7/10

About the tester

Age: 39  Height: 180cm  Weight: 76kg

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

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

As part of the tech team here at F-At Digital, senior product reviewer Stu spends the majority of his time writing in-depth reviews for, and ebiketips using the knowledge gained from testing over 1,500 pieces of kit (plus 100's of bikes) since starting out as a freelancer back in 2009. After first throwing his leg over a race bike back in 2000, Stu's ridden more than 170,000 miles on road, time-trial, track, and gravel bikes, and while he's put his racing days behind him, he still likes to smash the pedals rather than take things easy. With a background in design and engineering, he has an obsession with how things are developed and manufactured, has a borderline fetish for handbuilt metal frames and finds a rim braked road bike very aesthetically pleasing!

Add new comment


BehindTheBikesheds | 6 years ago

Those planet X cages are nasty looking and frankly given what you can buy these days expensive, PX sell the dlightly heavier Selcof carbon for £12 each and I've seen a pair of 16g Bontrager XXXL cages for £30.

JWL | 6 years ago

Or you could get a 22g Planet-X Carbon cage for 20 quid. I have a bunch of these and they are marvellous. 

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