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Easton EC70 SL Carbon Wheelset - 700c

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Item # EAS0052

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Item # EAS0052


Easton has been a continual innovator in the wheel building game, so it's no surprise that the EC70 SL Wheelset reaps the benefits of Easton's extensive experience. First, here's an aerodynamic carbon fiber rim cavity that's been mated to an aluminum braking track. This way,  you receive the weight and drag reduction of a carbon fiber rim, with the reliable braking of aluminum. Then, you add in Easton's proven R4 hubs and Sapim straight-pull spokes, and you have a wheelset that's ready for race day, training rides, or anything else that the road sends your way.

For the construction of the rim, Easton incorporated both its EC70 carbon fiber and its EA90 aluminum. The former was used for the main body of the rim itself, and reasons for this reveal themselves in a simple way. EC70 sits near the top of Easton's carbon food chain, with every wheel starting its life as a sheet of pre-impregnated carbon laminate. As for the variant of carbon used, Easton prefers the use of unidirectional carbon. Why uni-directional? Well, compared to a woven carbon fabric, unidirectional carbon is oriented as it sounds, with one direction, or on one axis. And while this makes the production process incredibly more complicated in regards to load path and force direction determination, the benefits are worth it. You see, compared to woven layups, unidirectional fibers tend to better stiffen wheels, while also improving the characteristic of vibration damping. And incredibly, this is achieved at a low overall weight.

As for the shape of the EC70 SL, Easton incorporated a 42mm rim depth with a 20mm external rim width. The depth alone provides an exceptional aerodynamic profile, but this has been furthered by the rim width's clean interface with a standard 23mm tire. Additionally, the wheel's spokes have been recessed into the rim, creating a much cleaner drag profile than that of exposed nipples. However, while rigidity and aerodynamics propel you to higher speeds with less effort, Easton designed these wheels with the full knowledge of a carbon clincher's greatest weakness -- actually stopping at high speeds. Accordingly, it created what it calls an 'H' section where the carbon meets the aluminum brake track. Essentially, this is a section of alloy extrusion that been co-molded to the structure of the carbon rim. This creates a clean, yet strong, transition to the rim, which, in turn, aids in heat dispersion during braking. So, in other words, Easton purposefully sidetracked the potential failures of overheating carbon braking surfaces, while guaranteeing the effective braking power of aluminum. And, impressively, this was achieved at the relatively low weight of around 1660 grams.

In terms of the build, the EC70 SL rims have been mated to Easton's R4 hubs with Sapim stainless steel spokes. The front has received 18 straight-pull spokes in a radial lacing pattern, while the rear wheel features 24 straight-pull spokes in a radial non-drive, two-cross drive side pattern. Now, if you've been examining the photos of the rear R4 hub, you've surely noticed that the drive side hub flange is oversized in comparison to the non-drive side. Here's why -- Easton found that the rotational force of pedaling resulted in the flex of driveside spokes. This slackens rim tension and creates a net loss in energy. So, the solution takes form in strengthening of the drive side flange. Accordingly, energy dissipation has been nearly eliminated.

The Easton EC70 SL Wheelset is available in the color Black and in a clincher configuration. Additionally, the rear wheel wheel is also available with either a Campagnolo or Shimano/SRAM compatible freehub body. Please note that the Shimano/SRAM configuration is not compatible with either Shimano or SRAM 11-speed cassettes.

Tech Specs

[rims] Easton EC70 carbon, [braking surface] Easton EA90 aluminum
Rim Width:
[internal] 15 min, [external] 20 mm
Rim Depth:
42 mm
Front Hub:
Easton R4
Front Hub Type:
Rear Hub:
Easton R4
Rear Hub Type:
stainless steel
Front Spoke Count:
18 Sapim
Rear Spoke Count:
24 Sapim
Brake Compatibility:
Complete Set Weight:
1660 g
Recommended Use:
road cycling
Manufacturer Warranty:
2 years

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Easton EC70 SL Carbon Wheelset - 700c

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Here's what others have to say...

would it be compatible to my shimano ultegra...

would it be compatible to my shimano ultegra cassette??

Responded on

No, this Campy variant will not work with a Shimano cassette.

You will need a Shimano compatible free hub body. Sorry, at this time, we are sold out.

Responded on

If the price is good enough and you have a couple weeks this is no big deal man. The cassette bodies are easily interchangable.

You can email Easton and they will swap out the unused freewheel cassette body off the wheel for the one you need, no cost at all.

I had to do this and the swap out was very easy. Instructions are on the Easton tech site.

Easton customer service is that good.

Do you think these are durable enough for...

Do you think these are durable enough for a Cross Bike? (I weigh 190lbs.)


Responded on

I am using an older model of these for cross and they have been great. If you bunny hop a lot you may want to get a higher spoke count as this wheel is an 18 in the front. If you are on the ground then they should be fine.

5 5

Highly recommended

These wheels are very cool. I have them on my BMC and use them as trainers. They are light, aero, durable (I'm 220lbs), and great looking. Would highly recommend.

Are these clinchers or tubulars?

Are these clinchers or tubulars?