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Question About Specialized S-Works Roubaix SL8 Seat Post and Tire Clearance

PB Forum :: Road Cycling and Touring
Question About Specialized S-Works Roubaix SL8 Seat Post and Tire Clearance

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flag AlexRent
Posted: May 4, 2024 at 16:41 Quote
I am an experienced marathoner, forced into early retirement due to shot knees and back issues. My doctor suggested cycling to maintain fitness. After numerous road endurance-type rides on my partner's flat bar bike, I have decided to go all in and purchase the Specialized S-Works Roubaix SL8. I have been fighting an internal battle between the S-Works Diverge STR and the S-Works Roubaix for months and have finally settled on the Roubaix mainly due to the adjustments and replacement costs of the suspension components and the added weight of the Diverge.

I will not have an opportunity to ride the Roubaix, however, after reading numerous articles, I forsee only one main issue. I am used to and appreciate the Thudbuster ST on my partner's bike. Is there any reason I couldn't install the eeSilk Carbon Seatpost on the Roubaix if I find the ride too jarring? The post is a bit short and there is no offset on the eeSilk. Will this pose an insurmountable problem?

Also, I believe 40mm is the max clearance. Would I be able to somehow squeeze a set of Tracer Pro 700x42 on there?

Finally, I have been reading so much about bikes that this has slipped from memory but how would mud guards affect tire clearance on this bike?

Thank you for any assistance!
flag mattytyson
Posted: Jul 22, 2025 at 10:49 Quote
Hey, really enjoyed reading your post, I’ve been on a similar journey transitioning from running to cycling after injuries, so I get where you’re coming from. The Roubaix SL8 is an awesome choice!

I don’t have direct experience with the eeSilk post on a Roubaix but I’ve heard others mention it pairs well. Curious what you end up doing, and would love to hear how you like the bike once you’ve got some miles on it!
flag kaitlyn94
Posted: Sep 3, 2025 at 20:08 Quote
I’ve pushed the limits on my SL8 and here’s the deal: you can maybe cram a 38mm in there if you run it on a perfect-width rim, with a perfectly true wheel, on a bone-dry day. But the second you see a hint of mud, that 38 becomes a frame-sanding machine—trust me, I learned the hard way and now my seat tube sings in A-flat. Save yourself the existential dread and stick with 35s; the extra 2mm isn’t worth the stress.
flag dirttorpedo
Posted: Sep 18, 2025 at 8:53 Quote
I test rode a Roubaix about two seasons back and liked it for the most part. The future shock stem was a deal breaker for me though. I'm leery about pushing tire size too much - particularly with carbon frames which I feel aren't as resistant to friction wear as steel or aluminum. From my experience fenders drop your tire width by one size. If you really want 40mm tires and fenders a gravel bike or touring bike is the way to go.
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