Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

Sprinting on tubeless

Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

Sprinting on tubeless

Old 08-10-20, 03:51 AM
Senior Member
Thread Starter
waters60's Avatar
Join Date: Sep 2010
Posts: 384
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 93 Post(s)
Liked 49 Times in 23 Posts
Sprinting on tubeless

The Enve 3.4 AR Disc wheels look very tempting; smoother ride and faster. One question I have is about how lower pressure wheels perform when sprinting. I don’t want any softness or spring in my wheels when sprinting. I would be interested in hearing from anyone who has ridden tubeless and can report their experience.
waters60 is offline  
Old 08-10-20, 06:02 AM
Senior Member
Join Date: May 2017
Posts: 360
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 142 Post(s)
Liked 45 Times in 31 Posts
I’m 190 lbs and run 28c GP5k’s at 75 psi on a 21mm wide (internal) rim. I feel no “spring” when I sprint. I think the wider rim bed helps with that substantially.
BluFalconActual is offline  
Old 08-10-20, 06:42 AM
Senior Member
WhyFi's Avatar
Join Date: Jan 2010
Location: TC, MN
Posts: 30,560

Bikes: R3 Disc, Haanjo

Mentioned: 337 Post(s)
Tagged: 1 Thread(s)
Quoted: 13521 Post(s)
Liked 2,800 Times in 1,506 Posts
I have the Zipp 303S - 23mm int, hookless - with 28mm Pro One Addix @+/-60psi. I guess that I can't say that you'll feel zero spring, but I can say that nothing sketchy or untoward has called attention to itself. A quick search says you'd have another 20psi to play with on the Enve, which seems to have a max of 80psi (Zipp states a max recommended in the low 70s for my 303S, but I haven't felt the need). I'm at 185-ish lbs and can put a fair amount of torque on the pedals.
WhyFi is offline  
Old 08-10-20, 10:37 AM
Seattle Forrest
Senior Member
Seattle Forrest's Avatar
Join Date: Mar 2010
Location: Seattle, WA
Posts: 21,321
Mentioned: 68 Post(s)
Tagged: 0 Thread(s)
Quoted: 12348 Post(s)
Liked 3,694 Times in 2,067 Posts
4.5 ARs at 65 to 70 psi, sprinting feels like it did on tubes.
Seattle Forrest is offline  
Old 08-10-20, 08:38 PM
Senior Member
woodcraft's Avatar
Join Date: Apr 2012
Location: Nor Cal
Posts: 5,249
Mentioned: 15 Post(s)
Tagged: 0 Thread(s)
Quoted: 1465 Post(s)
Likes: 0
Liked 508 Times in 299 Posts
I've been running tubulars at around 70psi, and get some squish- mostly noticeable with out-of-saddle climbing.

Figure it's a worthwhile trade off overall.

If you don't like what you get, a few more pump strokes will fix it.
woodcraft is offline  
Old 08-11-20, 03:29 AM
Senior Member
Join Date: Feb 2018
Posts: 993

Bikes: 2017 Specialized Allez Sprint Comp

Mentioned: 11 Post(s)
Tagged: 0 Thread(s)
Quoted: 598 Post(s)
Liked 170 Times in 125 Posts
For $3000, carbon wheels should come with di2 pressure control systems. Dial in some pressure in the rear tire when climbing, both if sprinting.

I will say that the “squish” matters a LOT less on race tires than reinforced tires. It’s enough to subtly alter your form with the latter - not good.

FWIW despite believing all the claims of softer is faster, I pump my tires a bit harder than normal for races or spirited rides. Wider tires will not stop you from running them hard. You’ll just be carrying a small amount of extra rotational weight that isn’t helping you besides maybe providing grip.

Last edited by smashndash; 08-11-20 at 03:33 AM.
smashndash is offline  
Old 08-11-20, 02:58 PM
Senior Member
Join Date: Apr 2009
Posts: 222
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 97 Post(s)
Likes: 0
Liked 23 Times in 20 Posts
You've got to get down below 30psi before it gets sketchy. At 40psi it can be bouncy - like when you take your MTB/CX/Gravel bike out for the first time after being on the trainer. It's really no big deal on a road bike at 60psi.

At lower PSI, you do have more sidewall travel though. This is good and bad. When you lose traction on 23c/100psi because you're over the bar giving it the business, the rear will hop as it unloads, skip,
instead of spin ( think we've all done this pulling away from a stoplight). Yes, this is traction loss, not something you did pedaling to lift the back end or that you tipped your weight over the front end (though these are factors) - high power cars with independent rear suspensions do this and performance cars with live axles do this under braking. With the lower tire pressure, the rear tire has got more choices other than grip or skip as it can deflect more, so it's less sketchy as long as the front isn't bouncing around.
jfranci3 is offline  
Old 08-13-20, 09:22 AM
Senior Member
Join Date: Sep 2008
Posts: 458
Mentioned: 12 Post(s)
Tagged: 0 Thread(s)
Quoted: 270 Post(s)
Liked 65 Times in 46 Posts
Running 25mm Schwalbes at 85-90 psi; I'm around 175lbs. My sprints are in club rides - the typical county line type of sprint. But back in the tubed 23mm 110 psi days, I had issues controlling the side-to-side skipping around. I was glad to see the above video - because I always attributed it to bad form. I still think it's bad form, but it's nice to see a pro do it. My max 3 second power is 1440 watts - so, far from pro stuff.

On the 25mm tubeless, I never feel any squish or squirm and I don't get as much skipping around.
Zaskar is offline  
Old 08-13-20, 11:28 AM
Senior Member
Join Date: Nov 2015
Location: Music City, USA
Posts: 3,637

Bikes: Felt AR

Mentioned: 50 Post(s)
Tagged: 0 Thread(s)
Quoted: 2117 Post(s)
Liked 727 Times in 370 Posts
Originally Posted by jfranci3 View Post

That's on the Champs Elysee, and specifically on the right side of the Champs Elysee, which is well known for being exceptionally bumpy and not a very good line.

He took a risk going that way and it didn't pay off. I don't think there's much he could have done with tire pressure to alleviate that particular part of the road when you're going 38+.
rubiksoval is online now  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.