Tubeless options for CX racing

Especially for light weight issues concerning cyclocross / touring bikes & parts.

Moderator: Moderator Team

sqber
Posts: 14
Joined: Sun Dec 21, 2008 12:51 am
Location: Tallinn
Contact:

by sqber

Friend of mine mounted a "33mm" Clement PDX on a regular 19mm rim and it measured 36mm. Physics or poor production?

mattr
Posts: 3817
Joined: Fri May 25, 2007 6:43 pm
Location: The Grim North.

by mattr

Physics.
The ETRTO tyre width measurement doesn't account for modern increased rim widths, or reduced rim wall height (both of which make the tyre larger). As far as ETRTO are concerned, 19mm is probably still an ultra wide DH rim.
Try an old open pro (15.5mm IIRC) then it'll be the right size. Or just get something like a 31, or one of the schwalbes, who appear to actually check their tyres WRT UCI rules.

by Weenie


erik$
Posts: 114
Joined: Sat Nov 15, 2008 5:26 pm
Location: Trondheim, Norway

by erik$

Last two rides I had the Terreno Mix 31 at 21/23 psi and it worked really well. Still not able to burp the tires when mounting, bunnyhoping or cornering on firm ground.

I am using a digital Topeak gauge and I have feeling that the pressure might be a tad higher than what it shows.

wheelzqc
Posts: 264
Joined: Thu Jun 09, 2011 6:51 pm

by wheelzqc

I've had good success running the Terreno mix at low 20's psi.

wheelzqc
Posts: 264
Joined: Thu Jun 09, 2011 6:51 pm

by wheelzqc

I mounted a pair of Specialized Terra Pro (33) for a UCI race this weekend. First they passed the width test easily. They weight 407-410g each (claimed 415). Thread kind of locks like a PDX but the I think the knobs are higher. They mounted tubeless easily. Grip is obviously outstanding on grass. It didn't rain as much as expected (just a bit) so it was not a mud fest. Sidewalls feel softer than the Vittoria Terreno line, I had to adjust pressure (more pressure for similair feel). So far so good and tempted to try their dry version Tracer Pro.

Marin
Posts: 3061
Joined: Wed Jan 22, 2014 11:48 am
Location: Vienna Austria

by Marin

I mounted Panaracer Crossblaster tire tubeless yesterday, no problems. They are labeled as 31mm and they are exactly 31mm wide on 19c Light Bicycle rims.

User avatar
FIJIGabe
Posts: 1561
Joined: Tue Sep 11, 2012 6:07 pm
Location: The Lone Star State

by FIJIGabe

ms6073 wrote:
Tue Jul 25, 2017 1:15 pm
Can't really offer much in the way of recent CX racing on tubeless as I always raced tubulars, but I am enjoying nice all-conditions riding with Schwalbe G-One Speed tires, but I would add that these are mounted on Enve M60 wheels which are 100% tubeless compatible. I make that distinction because experience with the original, non-tubeless Enve Twenty9 XC wheels yielded less than stellar results despite using 3 layers of Stan's (now use DT Swiss tubeless tape), I could not get them the tires to seal reliably, and anything less than 35-psi resulted in several flats.
Did you race this weekend at Millican? I used my PDX's and didn't have any problems with traction, at all. How was your experience with the Schwalbe's?
Madone 9 https://goo.gl/7UwZpV
Crockett https://goo.gl/f5PdCN
Madone 5 https://goo.gl/cMdyFo

Madone 4, Cobia. I own a lot of Treks.

wheelzqc
Posts: 264
Joined: Thu Jun 09, 2011 6:51 pm

by wheelzqc

I've been having great races with the Terra so far. outstanding grip, more than a PDX whichh was my favorite, and rolling resistance doesn't seem too bad. I've had races where it was less muddy than expected and they perform well.

Now I have a pair of Tracer waiting for a dry race. 350-360g each ! Knobs look soft and I'm curious to test out their grip.

erik$
Posts: 114
Joined: Sat Nov 15, 2008 5:26 pm
Location: Trondheim, Norway

by erik$

What are your rim dimensions, @wheelzqc?
The Terra range looks very promising based on your impressions.

I still haven't had any bad experiences with the 31 Mix either. They feel sturdy enough at low pressures and have not burped on me yet on grippy surfaces. Rock and root strikes to the rim are the enemies when going too low, but the same goes for tubulars, so no big difference there. Will probably crack my rim on the next outing after saying that.

wheelzqc
Posts: 264
Joined: Thu Jun 09, 2011 6:51 pm

by wheelzqc

IronCross 20mm. The Mix33 was probably UCI safe was well, looks like antyhing around 34mm of actual size will be ok. I did enjoy the mix but the Terra has much more grip, obviously. It would be a fair comparaison to have it up against the Tracer, but it's been raining lately. Overal both tires, Terra and Tracer, have an interesting lower weight.

erik$
Posts: 114
Joined: Sat Nov 15, 2008 5:26 pm
Location: Trondheim, Norway

by erik$

Great, thanks! Good to have alternatives.

Post Reply
  • Similar Topics
    Replies
    Views
    Last post