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Lack of comfort.

Old 03-28-20, 10:12 AM
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Lack of comfort.

my cx bike is beating the heck out of me..can fit up to 35-37
running 32 now but simply a bear. no relief. my roady is far more comfy.
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Old 03-28-20, 11:51 AM
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Could it have to do with riding them on different terrains? Is your cx bike just as uncomfortable on the road? What's your weight and tire pressure?
Brent
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Old 03-28-20, 12:11 PM
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Run 37s if they fit...that 5mm is a lot in terms of % more volume.
...or maybe the frame is unforgiving and not an ideal design for how you ride?
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Old 03-28-20, 02:06 PM
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Originally Posted by obrentharris View Post
Could it have to do with riding them on different terrains? Is your cx bike just as uncomfortable on the road? What's your weight and tire pressure?
Brent
so tire pressure is not my thing. running 100psi on roadbike.
tried 80psi on 32.
not sure how low is safe.
even on the dirt it is just a bear.
fast fun but beats the shat out if me.
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Old 03-28-20, 02:12 PM
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Originally Posted by thehammerdog View Post
tried 80psi on 32.
not sure how low is safe.
Off-pavement, if you're not having issues with your tires bottoming out, you're probably fine.

80PSI in a 32mm sounds extremely high. What's your bike+rider weight?
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Old 03-28-20, 02:40 PM
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80psi off-road sounds extreme--- I run 70psi on-road in a 30mm tire, and I weigh 97kg. Off-road in a 35mm tire, I'm running high 50s.

So the high pressure is probably part of it. Construction of the tire is also a possible factor. If the road bike is carbon and the CX bike is aluminum, that would be significant as well.
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Old 03-29-20, 09:47 AM
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Tire pressure and tire construction make lots of difference, wider tire at lower pressure will not necessary be more comfortable.
I was actually very pleasantly surprised to find out that on my bike Continental GP5000 32 mm at 60/62 PSI (front/rear) feel significantly more comfortable than Clement X'Plor MSO 36 mm (some strange 30 TPI non-TL version that came with Jamis Renegade) at 40/42 PSI. This is for ~190-200 lb rider + bike weight.
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Old 03-29-20, 10:31 AM
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Originally Posted by Oso Polar View Post
Tire pressure and tire construction make lots of difference, wider tire at lower pressure will not necessary be more comfortable.
I was actually very pleasantly surprised to find out that on my bike Continental GP5000 32 mm at 60/62 PSI (front/rear) feel significantly more comfortable than Clement X'Plor MSO 36 mm (some strange 30 TPI non-TL version that came with Jamis Renegade) at 40/42 PSI. This is for ~190-200 lb rider + bike weight.
using ritchey cx tires cheap im just fearful of flatting going to low. 35 with 70 run nicer.
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Old 03-29-20, 10:43 AM
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70 PSI for 35 mm tires (which are probably even wider in real life - did you measure their real width on your rims?) for off-road riding seems very high to me. Unless you are very heavy. 80 psi on 32 mm is also very high. I know that at my weight it is teeth shattering high even on bad pavement (I used to run exactly this pressure for some time).
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Old 03-29-20, 11:18 AM
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Originally Posted by thehammerdog View Post
35 with 70 run nicer.
If you're concerned about underinflation, err wide with the tires. It makes no sense to err svelte with equipment if that runs against optimal setup.

On my bike with 35s, at my ~200lb bike+rider weight, I use about 60PSI rear and 50PSI front even on good pavement.
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Old 03-29-20, 04:28 PM
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This may sound like a dumb question but have you checked the sidewall of your tires to see what the pressure range is for them? I run my 37mm x 700 on my Topstone at 45lbs front and 48lbs rear. Just a thought to look at and see if there is a recommended range.
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Old 03-29-20, 04:44 PM
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Thehammerdog,

This is important information for good responses

Originally Posted by HTupolev View Post
What's your bike+rider weight?
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Old 03-30-20, 03:32 PM
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Originally Posted by 12bike View Post
Thehammerdog,

This is important information for good responses
i am not tiny 215 lbs.
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Old 03-30-20, 03:40 PM
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Originally Posted by DrIsotope View Post
80psi off-road sounds extreme--- I run 70psi on-road in a 30mm tire, and I weigh 97kg. Off-road in a 35mm tire, I'm running high 50s.

So the high pressure is probably part of it. Construction of the tire is also a possible factor. If the road bike is carbon and the CX bike is aluminum, that would be significant as well.
well.
i seemed to have goofed 75psi is max...on the tires.
may explain the poor riding experience.
60 -65 psi will be the next try.
thanks guys.
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Old 03-30-20, 06:23 PM
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If you are worried about comfort on gravel those tires are too small for you. I went to 38mm and run them at about 30psi. It's more of a stability concern than comfort, but it can't hurt
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Old 03-30-20, 06:48 PM
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Originally Posted by thehammerdog View Post
well.
i seemed to have goofed 75psi is max...on the tires.
may explain the poor riding experience.
60 -65 psi will be the next try.
thanks guys.
you know about the tire presssure chart? 60psi on 32mm looks like a good baseline for you. Personally I think this chart is a little low for what I want on the road, but works well for gravel. Or do what the CX guys do - lower pressure until you hit a rim, then bring it back up a little bit. ;-)
I do go a bit less on my front tire if you want more comfort. If going through water shows a thinner contact patch on my front tire, I figure its over inflated...

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Old 03-31-20, 04:16 PM
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Originally Posted by chas58 View Post
you know about the tire presssure chart? 60psi on 32mm looks like a good baseline for you. Personally I think this chart is a little low for what I want on the road, but works well for gravel. Or do what the CX guys do - lower pressure until you hit a rim, then bring it back up a little bit. ;-)
I do go a bit less on my front tire if you want more comfort. If going through water shows a thinner contact patch on my front tire, I figure its over inflated...

very cool
thanks..
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Old 04-01-20, 10:48 AM
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Originally Posted by chas58 View Post
you know about the tire presssure chart? 60psi on 32mm looks like a good baseline for you. Personally I think this chart is a little low for what I want on the road, but works well for gravel. Or do what the CX guys do - lower pressure until you hit a rim, then bring it back up a little bit. ;-)
I do go a bit less on my front tire if you want more comfort. If going through water shows a thinner contact patch on my front tire, I figure its over inflated...

Dude, Thanks for the chart. I just saved it so that when the my wife asks me: "Ok, what pressure today?" I can say: "80-90psi, just like every other day you ask"& I can tell my kid that 20 psi on 32's ain't enough and have something with authority (a file from the internet) to point to.
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Old 04-01-20, 01:29 PM
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Very advanced pressure calculator (after registration): https://info.silca.cc/silca-professi...ure-calculator
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