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Easton EC70 Seatpost


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  • Black/0mm Setback, 27.2x350mm

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EC70 Seatpost

Easton's new EC70 Offset Seatpost is designed for those who are fanatical about their bike fit. Whether you need a zero offset or a setback post, or you want to change up the saddle's tilt without affecting the fore/aft or vice versa, the new EC70 has you covered. This lightweight post is constructed from unidirectional carbon fiber, like its range-topping EC90, however, it has a uniquely designed clamp assembly, and that's the part that makes this seatpost really interesting.

The post part is worth a mention for sure as Easton uses its typical carbon mastery to create a post that’s really light and stiff so no watt is wasted, but not so harsh that every bump and jolt gets transmitted directly to your spine. At the top, Easton bonds a forged aluminum head to the carbon shaft for an impressive strength to weight while keeping the cost low. The head is where it’s all new, patent pending, Independent Saddle Adjustment or ISA is housed. The takeaway here is its ability to offer completely independent fore/aft and tilt adjustments. You get a sleek head that's more minimal than traditional twin-bolt designs while still offering two pitch adjustment bolts, allowing the saddle angle to lock into place as if you were adjusting limit screws, but unlike a single bolt design, you get easier adjustability and more security.

The Easton EC70 Offset Seatpost is available in a Matte Carbon finish, a 350mm length, and in a 27.2mm diameter. Clamps for both round 7mm and 7 x 9mm Oval rails are included.

  • A lightweight carbon post for road, gravel, and 'cross rigs
  • Ud Carbon lay-up is strong and light
  • Choose between zero or 20mm setback options
  • Carbon post and aluminum head offer impressive strength to weight
  • 2 pitch adjustment bolts allow easy micro-adjustments to saddle angle
  • All-new ISA post head allows independent tilt and fore/aft adjustments
  • Comes with 7mm round and 7mm x 9mm Oval rail clamps
  • Item #EAS002O

[post] UD Carbon, [head] aluminum
0, 20mm
Claimed Weight
[Zero Offset] 7.4oz (210g), [Offset] 7.9oz (223g)
Recommended Use
commuting, cross-country, cyclocross, gravel, road cycling
Manufacturer Warranty
2 years

Tech Specs

What do you think about this product?


>Rating: 5

Comfortable and Easy

I've used it several times
True to size
Size Bought
20mm setback
5` 9"
160 lbs

At the time of the review, I've put in about 200 miles in on the seatpost. It is installed with carbon grip paste into a Ritchey Road Logic at 5NM at the seatpost clamp. No slipping issues, although that's more often related to the frame's tolerance. I've only had a few carbon seatposts over the years, I know they dampen vibration a little bit, depending on the length of seatpost showing. I have about 13cm of carbon showing(excluding the head of the seatpost as that's aluminum) and it's noticeably less buzzy than an aluminum seatpost. I'm riding a Ritchey Road Logic, a steel bike, so the vibration is stronger than most carbon frames, but this little bit of carbon helps to smooth out the rear end a little bit. The adjusting bolts are a little stiff at first as the threads on two bolts are blue threadlocked, but as you adjust them, the threadlocker loosens up a bit and the adjusting becomes easier. It can be slightly difficult to adjust as you loosen and tighten one bolt after another, but you can make very fine adjustments with the system, albeit slightly fiddley. I suggest a hard cover book and a bubble level app on your phone op top of the saddle to determine your saddle angle. I haven't had any issues with the saddle tilt changing as I ride or saddle sliding back and forth on the rails once I tighten to 5NM. The spec on the bolts are for 8NM, but wasn't sure that was required as I haven't had issues with 5. It comes with an extra set of clamps to accommodate for carbon rails, but I'm not sure if the torque specs are different on those as I have cromoly rails on my bike. I'd suggest this for anyone trying to take a bit of the edge off of the rear end vibrations. You can do a lot with tire selection, but some bikes only take 25mm tires, so this could give you a bit more vibration damping for the rear. If you need significant vibration damping, I'd look elsewhere like a pnw suspension dropper, Cane Creek eeSilk, RedShift's ShockStop, Canyon VCLS, and etc. The Easton EC70 only helps to slightly lessen the vibration on pavement/road chatter, not gravel or harsh potholes. Overall, if you're looking for a product to make your ride significantly more comfortable, look elsewhere(tires, saddle, shoes, bike fit, bar tape, etc). But if you already went through all those things and you're looking for a slight improvement in vibrations and a small weight saving, a carbon seatpost may be a good solution, and this particular one is pretty good.

>Rating: 4

Just in time to start Biking for summer!

Making some improvements to my bike to get into the summer biking mood! Lightweight super sturdy, I could not ask for anything else!