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Verdict: 
An excellent clamping system is the highlight, though it's a rather pricey post
Weight: 
265g

Easton's EA90 Offset seatpost gives 20mm of layback, decent weight, and good comfort. The highlight, though, is the very clever seat clamp design that allows you to adjust tilt and fore/aft independently.

  • Pros: An excellent clamping system; easy adjustments; secure
  • Cons: Price

There aren't a huge number of reasons that you'd change your seatpost, but it's a component that can add more than just a weight-saving or a comfort gain to your bike: position change, easier adjustments, more saddle position security...

> Find your nearest dealer here

Easton's EA90 is its top-end aluminium offering. It comes in 27.2mm only and you get 350mm of length to play with. There's a choice of two fit options, the 20mm layback that I have here, or a zero offset option.

Easton EA90 Offset Seatpost - 3.jpg

A bit more comfort can be found in the 20mm layback option, thanks to the slight flex increase, but I have found that zero offset seatposts are great if you're trying to get further over the bottom bracket.

This EA90 post replaced a zero-offset post on my bike and the difference is noticeable. It's very effective at killing road buzz and I also found it to be pretty comfortable off-road too.

Off-road impacts are always a good test of the clamp's ability to hold the saddle in place, too, and I had no issues here with slippage.

That clamp area is one of the best features of this seatpost, but one that could easily be missed thanks to the tidy integration of the design. The bolt that clamps the rails does only that – there's no ability to alter the tilt from this bolt. Tilt adjustment is via the two Allen key bolts at the front top end of the post. These are easy to get at, simple to adjust and everything remains firmly in place. It's a very effective system.

Easton EA90 Offset Seatpost - 2.jpg

Why is it a good thing? Some clamps can pull the nose of the saddle down when you torque the clamp bolt. Others seem to slip far too easily.

At 265g, this isn't the lightest option, especially given the price. Pro's Vibe 20mm offset post is lighter at 250g and cheaper at £79.99. Thomson's Elite post is £89.99 and comes in at a claimed 241g in the 16mm layback option, though it is 20mm shorter.

You can spend a lot more, though. Zipp's Service Course SL post is £156 and won't give you much more comfort.

> 9 ways to make your bike more comfortable

The easiest way to trim weight from your seatpost is simply to chop it down, remembering to leave at least 80mm extending into the seat tube to ensure safety.

Easton's clamp system is really good, and if you're looking for easy saddle adjustments then this seatpost is a great choice. The weight is okay and comfort is pretty good, too.

Verdict

An excellent clamping system is the highlight, though it's a rather pricey post

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road.cc test report

Make and model: Easton EA90 Offset Seatpost

Size tested: Head offset 20mm

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?

From Easton: "Our new EA90 seatpost applies our patent pending ISA saddle adjustment allowing for independent seat angle and fore-aft movement, helping you refine your positioning without needing to undo your rail clamps for each minute tweak. Saddle angle is then locked in place so you have the confidence your saddle will stay put after you find your fit."

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

Easton lists:

FINISH BLACK ANODIZED

WEIGHT ZERO - 259g / SETBACK – 268g

HEAD OFFSET 0mm, 20mm

LENGTH 350mm WITH 80mm MIN. INSERT

QUILL SIZES 27.2mm

MATERIAL EA90 ALLOY

Rate the product for quality of construction:
 
10/10

The design of the clamp area has to be commended. It's perfect.

Rate the product for performance:
 
9/10
Rate the product for durability:
 
9/10
Rate the product for weight (if applicable)
 
7/10
Rate the product for comfort (if applicable)
 
7/10
Rate the product for value:
 
5/10

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

Held my saddle very securely and killed a lot of road buzz.

Tell us what you particularly liked about the product

The clamp area. It's very cleverly designed and works perfectly.

Tell us what you particularly disliked about the product

For me personally, the price. I just couldn't fork out this much for a seatpost upgrade.

How does the price compare to that of similar products in the market, including ones recently tested on road.cc?

It's high. You're getting towards carbon territory. That said, it's a whole load cheaper than Zipp's Service Course SL post.

Did you enjoy using the product? Yes

Would you consider buying the product? If Easton brings out the EA70 out with this clamp, I'd have that one.

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

The price holds it back a little, but the clamping system is really good. Balancing out those two, it's an 8 overall.

Overall rating: 8/10

About the tester

Age: 24  Height: 177cm  Weight: 62kg

I usually ride: Cannondale Supersix Di2  My best bike is:

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

I regularly do the following types of riding: road racing, time trialling, cyclo-cross, commuting, club rides, general fitness riding, I specialise in the Cafe Ride!

Son of a Marathon runner, Nephew of a National 24hr Champion, the racing genetics have completely passed him by. Liam spends his time plodding his way through cyclocross races, very busy not winning. As an advocate for perfectly clean chains, he can be found cleaning his bike instead of training. A shop mechanic, Liam has many helpful skills, such as being able to identify 'cross tubs by the tread pattern alone. If you bump into him, he'll probably be eating.

1 comments

Avatar
ktache [1951 posts] 1 month ago
0 likes

I have an EA70 layback seatpost.  DIdn't even know Easton did an EA90, but I wouldn't have wanted this one as the last seatpost I had that was bonded, failed at the bonded area, noticed the saddle twisting, walked home as had just started my journey.  Could have been very nasty.  Floaty light Control Tech, 1p on Ebay, no one wanted a 30.9 that day.  I think it was comfy because the tubing was so thin.  Replaced with a steel Zoom.  Single peice.  Early 90s NOS.  I had had it for maybe 15 years though. 

The EA70 is layback with a single peice design.  27.2.  No fancy adjustor, 2 bolt design, took a while to get right, but will never ever need to be adjusted again.  Light enough.  It holds up my saddle.