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3T Zero25 Pro Seat Post



Easy-to-use seatpost with wide range of adjustability, but on the expensive side for its weight

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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The 3T Zero25 Pro Seat Post is a clever piece of kit, with the ability to shift between a 0mm and 25mm setback quickly and without too much fuss. It's not as exciting as the 3T Strada frame that's gained the company so much attention recently (and impressed Dave so much he gave it 9/10 in his review), but insofar as a seatpost can be exciting there are some ideas here worth raving about.

  • Pros: Easy to fit, adjustable
  • Cons: Not the lightest on the market

The Zero25 Pro post offers easy adjustability of the clamp at the top, which has either a 0mm offset or a 25mm offset.

> Find your nearest dealer here

The clamp system itself is made up of four plates with different rail channels (which can take either round or oval rails) and a bolt that runs through the middle to tighten them. If you want a 0mm offset you unscrew the Torx bolt and put the face plates on the other side and vice versa if you want a 25mm offset.


Fitting the seatpost is simple and 3T has included guide marks for minimum insertion and also measurement marks along the front to make it easy to get the exact right position if you are refitting the post.


Another element that I really like is the central line running down the back of the post, which makes it really easy to make sure that you are fitting the post straight, so there isn't the awkward saddle adjustment when you realise the nose is pointing out the side once you've fitted it.


The seatpost is 350mm long which gives it an impressive amount of adjustability for different heights, and is available in 27.2mm or 31.6mm diameters.


For the 3T Zero25 Pro's price, you are likely to find many carbon seatposts, most of which offer considerable weight savings, such as the Reilly Cycleworks Vector Carbon Fibre Seatpost and the Ultimate USE Duro. However, for many riders carbon is either not suitable or they simply prefer alloy. This seatpost uses 7075 aluminium alloy for the shaft and the head, which is the strongest widely-available aluminium alloy. That means it's lighter than many other alloy seatposts, even if it isn't as light as a carbon post.

On the move the seatpost works well: there was no slippage at all, the clamp held the saddle securely and it offered a secure platform for putting the power through the pedals. I rode it on some of the roughest roads I could find (in the North Kent hills this isn't too difficult) and it meant that I really tested the propensity for slipping or tilting. It passed with flying colours.

> Read more reviews of seatposts here

The 3T Zero25 Pro's 240g weight is not the best on the market, but is competitive with similarly priced aluminium posts. For instance, the Ritchey WCS Link Road Seat Post has an RRP of £80 and the Thomson Elite Inline Seat Post has an RRP of £79.99. Both are cheaper and claimed to be slightly lighter, but do not have the adjustability that the 3T Zero25 Pro offers.

The 3T Zero25 comes with an RRP of £95, which isn't the cheapest, especially for an alloy seatpost. However, this is a high quality post which offers more than just something on which to put your saddle – the innovative clamp and rigidity probably make this a fair price.

Overall I was impressed with the 3T Zero25 Pro seatpost. It may not be the lightest and is fairly expensive for an alloy model, but its solid hold, adaptability and ease of use helps to make up for that.


Easy-to-use seatpost with wide range of adjustability, but on the expensive side for its weight

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Make and model: 3T Zero25 Pro Seat Post

Size tested: 27.2mm

Tell us what the product is for

A seatpost for people who want to be able to adjust their saddle position quickly and easily, or who want a rigid, high-performance seatpost.

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

From 3T:

Shaft material Alloy 7075

Bolt material Stainless steel

Length 350mm

Setback 0mm & 25mm combined

Diameter 27.2mm or 31.6mm

Weight (+/- 4%) (g) 238 (27.2x350mm)

Finish Black with white accents

Rate the product for quality of construction:

Well made with an AI-Alloy 7075 body that keeps things relatively light and strong.

Rate the product for performance:

Provided a rigid foundation for pedalling and it's easy to fit a saddle with the clamping system.

Rate the product for durability:

Seems well made with strong material choice, and with the simplicity of the clamping system there isn't a huge amount that could break.

Rate the product for weight (if applicable)

It's heavier than others made of a similar material, but with its additional adjustability it's acceptable.

Rate the product for value:

You could get a mid-range carbon seatpost for the same price, and other alloy options are cheaper, but with the quality of construction and adjustability it's about right.

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

Very well, there was no slipping, it's rigid, and it held the saddle in place even on rough surfaces.

Tell us what you particularly liked about the product

The ease of attaching the saddle.

Tell us what you particularly disliked about the product

I would prefer a hex bolt to a Torx, simply because they are found on more multi-tools.

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

It's a high quality post with an innovative clamp and no issues with rigidity or slipping. The price is a little high but acceptable given the quality and features. A good 7.

Overall rating: 7/10

About the tester

Age: 29  Height: 6 ft  Weight:

I usually ride: Cinelli Gazzetta  My best bike is: Cannondale Supersix Evo

I've been riding for: 5-10 years  I ride: Every day  I would class myself as: Expert

I regularly do the following types of riding: commuting, club rides, sportives, general fitness riding, fixed/singlespeed, mountain biking

George is the host of the podcast and has been writing for since 2014. He has reviewed everything from a saddle with a shark fin through to a set of glasses with a HUD and everything in between. 

Although, ironically, spending more time writing and talking about cycling than on the bike nowadays, he still manages to do a couple of decent rides every week on his ever changing number of bikes.

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