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Easton EC90 SL ISA Carbon Seatpost

EastonEC90 SL ISA Carbon Seatpost(Return to Product Page)

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(10 customer reviews)
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User submitted reviews

Review by ehren51

Does not disappoint
by ehren51
Cycling Enthusiast
Minneapolis, MN

I did my research on seatposts so you don't have to. This baby is the carbon seatpost you need for your carbon rocketship. It's not only cool to the bones, but it is also functional as all getout. The fore/aft adjustment screws make it so you don't have to swear when you're adjusting that last degree out of your seat. Although when you're done, you will swear anyways because it's so much fun. Dang, just buy this thing now.

Reviewed 3/13/2026
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Review by Zhihao Y.

Easy to swap saddles
by Zhihao Y.
Los Angeles

Although ISA is designed to ease saddle adjustment, adjusting angle isn't that intuitive... But it's indeed easy to swap saddles, because the angle doesn't change when doing so.

And of course, gorgeous looking.

Reviewed 3/14/2026
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Review by bigDyl

Seatpost is a seatpost!
by bigDyl
SLC

Works well. Adjustment is easy. It's light and looks about as good as a seatpost can. My seatpost came with the 7x9 oval rail kit as extra, which the listing explicitly says is not included. So anyone worried about getting that, just know it will likely be included.

Reviewed 2/21/2026
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Review by Anonymous

Lightweight, innovative adjustment
by Anonymous
Seattle WA

Very light and has an innovative and convenient saddle angle adjustment system. Comes with hardware for either round or oval seat rails. I used carbon friction paste and torqued to specifications.

Reviewed 10/26/2025
TriSports.com Comments
FYI - the saddle does NOT include the oval rail kit any longer, it can be ordered separately - BTD
Thank you for your feedback.

Review by Anonymous

Lightweight, innovative adjustment
by Anonymous
Seattle WA

Very light and has an innovative and convenient saddle angle adjustment system. Comes with hardware for either round or oval seat rails. I used carbon friction paste and torqued to specifications.

Reviewed 10/25/2025
Thank you for your feedback.

Review by PNW Gravel

Great upgrade
by PNW Gravel
Cycling Enthusiast
Seattle, WA

Love this seatpost! Super easy to adjust and love that you can isolate certain changes so you don't totally mess up your specs if you just want to make a small tweak. Worth the investment!

Reviewed 2/14/2025
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Review by Anonymous

Surprisingly good at vibration reduction
by Anonymous
Cycling Enthusiast
Everett, WA
2 of 2 customers found this review helpful.

I swapped this in for an aluminum post and it was barely any difference on weight but noticeably better for vibration/chatter on my road bike which is running on 28mm tires.

Highly recommended!

Reviewed 6/15/2023
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Review by Anonymous

Excellent lightweight carbon seatpost
by Anonymous
2 of 2 customers found this review helpful.

This Easton ISA Carbon seatpost is great! Switched from an aluminum post that i was having lower back pain from. This carbon post soaks up alot of road vibrations so much easier on the lower back also much lighter too and easy to adjust . Highly recommend this product!

Reviewed 7/20/2021
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Review by Anonymous

Outstanding
by Anonymous

Super easy to adjust and very light.

Reviewed 7/28/2023
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Review by Andrew

Great seatpost
by Andrew
Tulsa
2 of 2 customers found this review helpful.

Great seatpost does what it suppose to do, saddle is always secure was much needed to help reduce vibration from gravel.

Reviewed 6/13/2022
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