Author Topic: cross tires  (Read 5216 times)

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Offline globecanvas

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cross tires
« on: October 16, 2012, 01:51:58 PM »
I have been running Specialized Tracer Pro 33s.  They are super light and they hook up great, I love the way the tires ride.  But the flats are killing me.  In the past 350 miles I have gotten 3 punctures and 6 pinch flats.   The punctures were all while running tubeless, the pinch flats were with tubes at pressures between 30-35 psi. 

A bunch of guys here run Kenda Happy Medium 40s, but I figure I already have a 29er, I'd rather run cross tires on my cross bike.

In any case, I need to switch tires.  What are others riding, and how do you like them?

sickmtbnutcase

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Re: cross tires
« Reply #1 on: October 16, 2012, 01:57:49 PM »
I'm running some super-cheap 35mm Ritchey Speedmax Comp tires. I've never seen anyone else running them at local races. I got 'em simply to get my feet wet in cross and didn't know if I'd like it as much as I found I do. I love these tires.

No issues with flats and I run tubes. I run ~34psi and weigh 172 lbs and the bike is 24 lbs. They hook up really well and roll quite fast. Cornering traction is awesome.



tetonrider

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Re: cross tires
« Reply #2 on: October 16, 2012, 02:32:41 PM »
I have been running Specialized Tracer Pro 33s.  They are super light and they hook up great, I love the way the tires ride.  But the flats are killing me.  In the past 350 miles I have gotten 3 punctures and 6 pinch flats.   The punctures were all while running tubeless, the pinch flats were with tubes at pressures between 30-35 psi. 

A bunch of guys here run Kenda Happy Medium 40s, but I figure I already have a 29er, I'd rather run cross tires on my cross bike.

In any case, I need to switch tires.  What are others riding, and how do you like them?

i'm a tubular guy so no insight here, but 2 things come to mind:
* clinchers @ low pressure are really prone to pinch flats. i couldn't run a much fatter MTB tire @ 35psi without really risking pinching, and you're running a much narrower tire = greater risk. watch out for this for any clincher you get.

* also, most pumps i have seen are pretty inaccurate at lower pressure, so if you think you are running 30psi, you could be running 24. just pointing it out as the pinching MAY not be the tire there. it could simply be that everything is off and you'll experience this again.

Offline Seth

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Re: cross tires
« Reply #3 on: October 16, 2012, 02:46:23 PM »
Challenge Fango/Grifo 32's currently. I like them a lot.

The puncture flat thing could be different for you, but we have a few places with goatheads (or w/e you call them) that pretty much require you run Stans in your tubes unless you want to end your race prematurely (sometimes this is also a good idea). I have been running, according to my pump (not digital gauge - afraid of getting Stans in it), ~35psi and getting away with it. I'm 165lbs and bike is 19lbs.

Offline globecanvas

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Re: cross tires
« Reply #4 on: October 16, 2012, 02:51:27 PM »
I hear you on the psi and clinchers, and the pump accuracy.  I'll check the reported psi against some other pumps.  But I really hope 35 psi is realistic for 33c clinchers. 

3 of the flats were punctures so I do think these specific tires are designed entirely for weight and not at all for durability.  (We don't have goat heads, whatever those are, punctures here are usually from sharp rocks or man-made sharp things.)

Also, I know everyone's experiences are subjective, but I run 29x2.*  tires (much larger obviously so who knows if the comparison is meaningful at all) at 18-20 psi, which I know is super low, but I have never once pinch flatted.  I've punctured, gashed, and destroyed 29er tires in all sorts of ways, but never pinch flatted.  Also FWIW, that 18-20 psi is using the same pump.

Of course, if I continue to flat every 30-40 miles with new tires, it will become much harder to blame the tire.

Offline wens

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Re: cross tires
« Reply #5 on: October 16, 2012, 03:27:20 PM »
Mud2's. By far the most popular clincher locally. I weigh 175ish, i run low 30s in the front and mid 30s in the rear. I've pinch flatted the rear in one race, but running any higher pressure i'm out of the race anyhow because i can't corner worth a damn.
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tetonrider

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Re: cross tires
« Reply #6 on: October 16, 2012, 04:12:53 PM »
3 of the flats were punctures so I do think these specific tires are designed entirely for weight and not at all for durability.  (We don't have goat heads, whatever those are, punctures here are usually from sharp rocks or man-made sharp things.)
possibly. what is the weight?

Also, I know everyone's experiences are subjective, but I run 29x2.*  tires (much larger obviously so who knows if the comparison is meaningful at all) at 18-20 psi, which I know is super low, but I have never once pinch flatted.  I've punctured, gashed, and destroyed 29er tires in all sorts of ways, but never pinch flatted.  Also FWIW, that 18-20 psi is using the same pump.
really? holy cow. there is no way i could run a 2.x" tire at 18psi without pinching on my MTB trails. pretty amazing that you can.

a larger volume tire should allow for lower pressure (before pinching) vs a narrower / lower volume tire. i'm surprised by what you are experiencing. of course, terrain will be a factor.


back to your original post...what tubes are you running? anything light or ultralight? just trying to rule that out.

Offline globecanvas

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Re: cross tires
« Reply #7 on: October 16, 2012, 04:47:49 PM »
Tracer Pro 33 clinchers are listed at 285g each, they are about the lightest CX clincher out there.  Tubes are michelin airstop butyls.

There is a cult of low offroad psi around here.  I have many hundreds of single track miles on a 29er with tubes at 20 psi or less (assuming my pump gauge isn't wrong the other way :) ) and honestly, I have shredded tires all sorts of different ways but I have never pinch flatted.  Maybe I'm just really lucky, but it's all tangential anyway.

For 33c clinchers, I don't think 30-35 psi is unreasonably low under a 155 lb rider.  And even if it is, or if my pump gauge is wrong, puncturing every ~100 miles is still too much.

I appreciate all the input, but given the data I'm sticking with "these tires are flimsy" for now, and looking for alternatives.  My teammates who race cross are all on tubulars, but I don't want to go down that rabbit hole yet.

tetonrider

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Re: cross tires
« Reply #8 on: October 16, 2012, 05:00:27 PM »
Tracer Pro 33 clinchers are listed at 285g each, they are about the lightest CX clincher out there.  Tubes are michelin airstop butyls.

There is a cult of low offroad psi around here.  I have many hundreds of single track miles on a 29er with tubes at 20 psi or less (assuming my pump gauge isn't wrong the other way :) ) and honestly, I have shredded tires all sorts of different ways but I have never pinch flatted.  Maybe I'm just really lucky, but it's all tangential anyway.

For 33c clinchers, I don't think 30-35 psi is unreasonably low under a 155 lb rider.  And even if it is, or if my pump gauge is wrong, puncturing every ~100 miles is still too much.

I appreciate all the input, but given the data I'm sticking with "these tires are flimsy" for now, and looking for alternatives.  My teammates who race cross are all on tubulars, but I don't want to go down that rabbit hole yet.

is your terrain rocky at all?

i agree--those tires seem flimsy, but for whatever reason they just don't do it for you.

all else equal, a narrower tire needs higher pressure not to pinch. if you can get away with 18-20psi on a MTB tire (again, shocking...i'm guessing that your pump gauge is way off, as most are), then 30-35 on a 700x33 could make sense.

i can't ride tubeless MTB here at lower than mid-25s.

how about the schwalbe racing ralph equivalent cross tire?

Offline globecanvas

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Re: cross tires
« Reply #9 on: October 17, 2012, 12:15:22 AM »
We have a few rocks around here.  http://www.google.com/search?q=gunks+rocks&tbm=isch

However, the local rockology tends to not have sharp rim-bashing corners.  I'm sure there are many areas where wheels take a harder beating.

I'm reassured by the guys chiming in who run 35 psi or less on cross clinchers, and thanks for the tire recommendations.   I think what I probably need to do is keep something like the tracers, racing ralphs, grifos etc as race-only tires, and just surrender and get something beefy, like the happy mediums, for riding the trails.   

Offline wens

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Re: cross tires
« Reply #10 on: October 17, 2012, 01:06:17 AM »
fwiw i heard one of the light local women ran (what her pump said was) 18/20 in clinchers with tubes last weekend. I'm pretty sure i couldn't run 18 in a tubular, but i've done 3/4 of a race on a teammate's rear wheel that only had 30 in it, so it's possible to run standard clinchers pretty silly low.
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makel

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Re: cross tires
« Reply #11 on: October 17, 2012, 03:03:17 AM »
I have the stock ones on my bike still. I've had four flats so far with tubes that have stans in them.
I believe my tires are Specialized Tracer Sport, 60TPI, wire bead, 700x33c.
I've been told by a few people that they are decent tires, but I'm starting to have serious doubts about that.

Offline globecanvas

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Re: cross tires
« Reply #12 on: October 17, 2012, 12:40:35 PM »
My teammates are hot on Challenge Limus tires.  They look sweet but unfortunately I can't get those before this weekend's race, so I picked up a pair of Mud2s to try out.  Thanks for the reco wens!

Offline wens

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Re: cross tires
« Reply #13 on: October 17, 2012, 12:49:20 PM »
My teammates are hot on Challenge Limus tires.  They look sweet but unfortunately I can't get those before this weekend's race, so I picked up a pair of Mud2s to try out.  Thanks for the reco wens!


I know some of the locals have run limus (tubulars) in the mud, I've heard they don't roll well at all on pavement/hardpack if that affects your decision.
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makel

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Re: cross tires
« Reply #14 on: October 18, 2012, 02:55:50 AM »
I shared the specialized issue with someone at practice and they replied with a comment that someone they knew had the same issues when they ran specialized tires for cx.
 
Interesting.... I think I'm going to put the specialized tires on my cheaper spare wheels, and buy new tires now.