Proven low-pressure burpless wheel/rim and tubeless tire combinations for cyclocross?

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

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youngjun91
Posts: 4
Joined: Fri Sep 28, 2012 4:05 am

by youngjun91

Hi, is there a list somewhere of proven wheel/rim and tire combinations that do not burp at low pressure (maybe mid 20's to 30 psi?) while cornering hard or going over bumps and obstacles encountered in a CX race? I recall that Stan's had some rims with a list of burp-free tire combinations. This was used by some master's pros racing successfully in the 20-something pressure range IIRC. Is it diameters that make these combinations burp-free; or features on the rim that prevent burping? Here's two examples: https://www.cxmagazine.com/review-stans ... -wheelsets and https://www.cxmagazine.com/jake-wells-r ... ubes-valor. Bonus if the rims are tall/aero for gravel racing. Also, does hookless or hooked make a difference for preventing burp? Does such a list of proven combinations exist?

grover
Posts: 1263
Joined: Mon Jul 26, 2004 1:06 pm

by grover

https://tubolight.bike/shop/tubolight/

That has made CX tubeless much more reliable for me. 18 grams per wheel. Lower pressure due to the ability to absorb some impact. Higher burp resistance (I've never burped with these in). This is on Zipp 202 Firecrest with WTB Cross Boss 35mm

by Weenie


youngjun91
Posts: 4
Joined: Fri Sep 28, 2012 4:05 am

by youngjun91

Interesting Grover, I will look into these more. At the very least, these seem to be able to protect the clincher rims from damage on sharp edges!

MikeD
Posts: 390
Joined: Thu Dec 11, 2014 9:55 pm

by MikeD

You need a rim with bead retention humps in the rim bed and make sure you have a tight fit tire to the rim.

CrossRob
Posts: 71
Joined: Tue Dec 14, 2010 9:18 pm

by CrossRob

I've had good luck with Kinlin rims, particularly the XR26T, over the years. For the last two seasons (about 15 races plus training), I've run them at 25-30psi (I'm 80kg), with Specialized Terra and Tracer tyres.

They've only burped once, when a three inch nail was stuck inside the tyre!

youngjun91
Posts: 4
Joined: Fri Sep 28, 2012 4:05 am

by youngjun91

MikeD wrote:
Sat Jan 09, 2021 4:52 pm
You need a rim with bead retention humps in the rim bed and make sure you have a tight fit tire to the rim.
Do these count as bead retention humps: Hunt Wheels calls it their H-lock, which looks like a slightly sloping bead shelf. Looks like Lightbicycle has also got these slightly sloped shelves. Are these effective? I recall awhile ago that the now defunct company American Classic used to make tubeless wheels (e.g. the Hurricane, maybe) which had these barbs to keep the bead from moving towards the center channel. Looks like Industry Nine's ULTRALITE 235 TRA (also discontinued) may also have a feature like this. Do other companies try to do this anymore? Or are these sloped shelves from Hunt and Lightbicycle effective features that keep the bead from moving towards the center channel? Which rims have these bumps (which I assume would be more effective than the sloped bead shelf)?

Also, does hooked vs hookless matter for burping? I'm assuming not if burps are caused by what I assume to be an inward movement of the tire.

youngjun91
Posts: 4
Joined: Fri Sep 28, 2012 4:05 am

by youngjun91

OK, I see these here being retention bumps: https://novemberbicycles.com/blogs/blog ... tion-bumps. Looks like it would definitely help. I also wonder if the rising relative popularity of wider gravel wheels/tires is making manufacturers focus less on cyclocross technology for 33mm tires.

by Weenie


stoney
Posts: 313
Joined: Wed Jun 08, 2011 11:26 am

by stoney

youngjun91 wrote:
Thu Jan 14, 2021 3:24 am
OK, I see these here being retention bumps: https://novemberbicycles.com/blogs/blog ... tion-bumps. Looks like it would definitely help. I also wonder if the rising relative popularity of wider gravel wheels/tires is making manufacturers focus less on cyclocross technology for 33mm tires.
Yep, cyclocross is a small participation sport now compared to gravel and nobody really wants to ride narrow 33mm tires on dirt, gravel and singletrack. Heck, some people insist on running 32mm tires on the road.

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