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Tire Pressures
 

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PLee
Joined: 08 Dec 2003
Posts: 3651
Location: Brooklyn, NY

9/27/19 8:18 AM

Tire Pressures

I thought the recommended tire pressures on the ENVE website were interesting:

https://www.enve.com/en/products/ses-4-5/

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KerryIrons
Joined: 12 Jan 2004
Posts: 3002
Location: Midland, MI

9/27/19 9:23 AM

More?

Doesn't differentiate between front and rear, seems to be a lot less difference between 23 and 25 mm than most recommend, and seems low overall by a fair bit. If these were front pressures, then maybe just a little bit on the low side, but for rears?

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Brian Nystrom
Joined: 26 Jan 2004
Posts: 4530
Location: Nashua, NH

9/28/19 8:23 AM

Considering the width of the rims, they don't seem out of line to me.

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Brian Nystrom
Joined: 26 Jan 2004
Posts: 4530
Location: Nashua, NH

9/28/19 8:24 AM

Considering the width of the rims, they don't seem out of line to me.

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KerryIrons
Joined: 12 Jan 2004
Posts: 3002
Location: Midland, MI

9/29/19 9:57 AM

Out of line?

71 psi (4.9 bar) for a 23mm rear tire with a 180 lb. (82 kg) rider? That seems pretty low to me.

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Sparky
Joined: 08 Dec 2003
Posts: 17510
Location: Portland, OR

9/29/19 10:14 AM

I would not go near that low, but I am also 203 lb currently.

I don't go lower than 70 front 25-28mm. 74 rear.

I got my second ever snake bite flat on road bike the other day. 17c carbon rim with a 28mm tire, 70 PSI rear. Last one was on a 15c rims 23mm tire @ 85PSI. But I was 225-8 lb then. Both same thing happened, a chuck of gravel I hit squarely with the rear, but somehow never saw nor hit with the front... Probably nicked it front and sent it directly in line with the rear line.

I only saw the one hole and patched it with the edge of the patch right at the other snakes tooth. Had to pull it and throw in a tube instead.

Need reading glasses to change a flat anymore apparently... Did not have any with me.. Something else to carry along...

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PLee
Joined: 08 Dec 2003
Posts: 3651
Location: Brooklyn, NY

9/29/19 12:49 PM

These are recommendations for tubeless tires. Do tubeless tires take lower pressures?

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Sparky
Joined: 08 Dec 2003
Posts: 17510
Location: Portland, OR

9/29/19 1:59 PM

I run 75/80 psi with tubless 23s fwiw. I also have tubless 28s run same cause they just feel right there to me.

So yes for me.

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stan
Joined: 14 Feb 2004
Posts: 453

9/29/19 10:02 PM


quote:
These are recommendations for tubeless tires. Do tubeless tires take lower pressures?


The main thing is tubeless are much more flat resistant, especially for snakebikes. So you can safely run them with less pressure.

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Sparky
Joined: 08 Dec 2003
Posts: 17510
Location: Portland, OR

10/13/19 12:27 PM

I rode the disc Strong just under 40 miles, and hard pace [FTP/+FTP ?] for a lot of it.

Tires: Hutchinson Override 35mm tubeless on 21x622 rims @ 65 PSI. These run a touch small, 34.5mm on those fat rims, I'd call then 33s. They sport a solid smooth center ridge, my winter tires pretty much. Now I've had a good year, weigh a lot less and fitness is VG. They did not feel heavy @ the ride finish, and I pushed up to maybe 2 miles from end. I am sure I'd have noticed mass more with less fitness/more girth [I remember well]. IIRC, 365 grams, plus sealant weight.

I definitely would have needed to put out more watts to do the 2-3 MPH faster AVG speed I roll my road [go fast] bike [carbon rims, 215gr tires]. And if I had tried I am sure the distance would have had me wasted when done.

Had been using 70/75 PSI in 2018, but as someone pointed out to me in one of our PSI threads, I have 35 lb less gross weight, I should drop pressures, something that escaped me oddly enough.

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Brian Nystrom
Joined: 26 Jan 2004
Posts: 4530
Location: Nashua, NH

10/14/19 6:22 AM

Even 65psi seems high in tires that fat.

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Sparky
Joined: 08 Dec 2003
Posts: 17510
Location: Portland, OR

10/14/19 10:14 AM

I may be stuck in older thinking a little, but don't agree. Even looking at the rear saddled, I see some bulge @ my current weight. By some I mean noticeable to the point if I did not know for sure I might check the tire.

My bigger 'adjustment' for the 'winter' setup is the bars. I have lowered them each of the last two uses of the bike. After a good summer of go fast bikes with a reasonable aero position, 1-1/2" drop seems to have me put more rear weight than I guess I have had since last year. Perhaps the rear bulge being more is a product of that to a degree.


Last edited by Sparky on 10/14/19 10:39 AM; edited 1 time in total

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Brian Nystrom
Joined: 26 Jan 2004
Posts: 4530
Location: Nashua, NH

10/14/19 10:28 AM

You should have some bulge in the tire and it will be more noticeable in wider tires than in narrower ones. Gauge the pressure by the ride quality, not the appearance of the tire.

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Sparky
Joined: 08 Dec 2003
Posts: 17510
Location: Portland, OR

10/14/19 10:49 AM

So you think I should go/try as low as 55 PSI rear?

I am kind of thinking if I am getting the nice ride already, lower PSI and what ever additional CRR, why?

I think I will actually do some sag measuring saddled at current and lower PSI. You may well be right due to them being tubeless.

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PLee
Joined: 08 Dec 2003
Posts: 3651
Location: Brooklyn, NY

10/15/19 7:32 AM

Given the number of potholes in my usual riding routes in New York City, I think I'll run higher pressures in my old school tubed tires.

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Brian Nystrom
Joined: 26 Jan 2004
Posts: 4530
Location: Nashua, NH

10/15/19 11:44 AM

Run whatever pressure you're comfortable with. IIRC, when I was using the 35s on vacation, I ran them at 45/50 f/r on 17mm internal rims, compared with my usual 70/80 with 25s on 13.6mm internal rims.

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Sparky
Joined: 08 Dec 2003
Posts: 17510
Location: Portland, OR

10/15/19 1:04 PM

What is your weight, else the numbers are kinda moot??

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dan emery
Joined: 11 Jan 2004
Posts: 6294
Location: Maine

10/15/19 3:43 PM

Hell with pressure

Letís talk about color. Offered strictly FWIW:

https://janheine.wordpress.com/?utm_source=Retail+Customer+Newsletter&utm_campaign=bfbac4b30a-EMAIL_CAMPAIGN_2017_11_29_COPY_01&utm_medium=email&utm_term=0_f74fbd5ca8-bfbac4b30a-108703741&mc_cid=bfbac4b30a&mc_eid=1124689c2b

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Brian Nystrom
Joined: 26 Jan 2004
Posts: 4530
Location: Nashua, NH

10/15/19 7:02 PM

I'm typically 170-172#.

Years ago ,I had some Conti tubulars with orange tread. I never noticed any difference in traction or tread wear, but I wasn't racing or pushing my cornering limits anyway. I have a pair of black and red knobbies that look really sweet on my red/black/white Pinarello 'cross bike. I don't ride it anymore, so I have no idea if there's much of a traction difference. Come to think of it, how could you tell when riding off-road anyway?

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KerryIrons
Joined: 12 Jan 2004
Posts: 3002
Location: Midland, MI

10/18/19 8:57 AM

Silica

Colored tires mean that fumed silica rather than carbon black was used as a filler. This gives a rubber that has less wear resistance and poorer traction. The data is out there.

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Sparky
Joined: 08 Dec 2003
Posts: 17510
Location: Portland, OR

10/18/19 10:24 AM

A known as far as I know. If I have colored tires it is not where carbon black meets the road. ;)

Beside, how long will the tread stay that pretty disco color anyway?

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Brian Nystrom
Joined: 26 Jan 2004
Posts: 4530
Location: Nashua, NH

10/18/19 12:05 PM

That's interesting, Kerry. I'm familiar with fumed silica for other applications. It's commonly used a thickener for epoxy in boat building. It also adds abrasion resistance and I use it when epoxy-coating paddle tips. It's so light that it almost floats out of the can!

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Sparky
Joined: 08 Dec 2003
Posts: 17510
Location: Portland, OR

10/18/19 1:59 PM

My fav MTN tires for years were the green Michelins. Fast and light, and spit mud like champs.. Still have a pair on the wall...

It seems I have settled into 650b for off road. Including on the ride I just finished, old disc 29er hardtail, the smaller wheels/tires help untruckify...

EDIT:
For the ride it was some coarse paved MUT and wet hardpack single track. One section to and from the single track was dumped mulch for a few hundred feet. Looks like they used chipper fodder from some brushwork to raise an access carriage road surface above waterline of some low spots.

The 47x650b floated nicely, about 35 PSI with tubes [although tubeless]. I aimed my line to the edge just because it was less work than drudging thru the soft thick layer of freshly laid mulch. I 'tire' of dealing with sealant maintenance frankly, so be lazily just tubing a lot of installs of late.

The tires; WTB Horizon Gravel, pretty slick centers with edge bitey bits. A little slippin and sliding, but it was not mucky as much as just wet. The hard pack surface was slimy though. My Moto-CX genes did some auto pilots in sections, yada.


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