Go Back  Bike Forums > Bike Forums > Road Cycling
Reload this Page >

60 psi ok for 28mm tires?

Notices
Road Cycling “It is by riding a bicycle that you learn the contours of a country best, since you have to sweat up the hills and coast down them. Thus you remember them as they actually are, while in a motor car only a high hill impresses you, and you have no such accurate remembrance of country you have driven through as you gain by riding a bicycle.” -- Ernest Hemingway

60 psi ok for 28mm tires?

Old 04-26-21, 11:54 PM
  #1  
Symox
Senior Member
Thread Starter
 
Join Date: Jul 2020
Posts: 651

Bikes: '07 Specialized Roubaix Comp Triple, '12 Gravity Fixie, '21 Liv Rove 4, '06? Giant EB Spirit

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 334 Post(s)
Liked 213 Times in 135 Posts
60 psi ok for 28mm tires?

I know there is no definitive answer to this but I'd like your input nonetheless...

I weigh 155lbs, bike is around 17lbs (probably less but haven't checked). I ride on tarmac only (dry or wet) and use 28mm Continental Gatorskins (yeah I know some hate 'em - I think they are fine for my needs) with Mavic Open Pro rims.

I used to ride at max pressure until reading on this very forum how lower pressures can help ride quality. Well the lower pressures certainly have. I have found that if I run 60psi on the front and 70psi on the rear I get excellent traction, comfort and no pinch flats (knock on wood). (most importantly, the bike isn't twitchy on fast downhills like it usually is at 110psi).

So, am I asking for trouble at these lowish pressures? I don't think its possible for the tire to dislodge from the rim as it is friggin' hard to remove the tires from the rim in the first place but that is one of my concerns

Thanks for your insight and/or recommendations
Symox is offline  
Old 04-27-21, 12:06 AM
  #2  
Badger6
Obsessed with Eddington
 
Badger6's Avatar
 
Join Date: Jun 2013
Location: Brussels (BE) 🇧🇪
Posts: 1,329

Bikes: '16 Spesh Diverge, '14 Spesh Fatboy, '18 Spesh Epic, '18 Spesh SL6, '21 Spesh SL7, '21 Spesh Diverge...and maybe n+1?

Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 531 Post(s)
Liked 620 Times in 368 Posts
You are potentially risking pinch flats, Gatorskins have a tough casing which is not very supple (but is the reason they are generally so durable), but it is unlikely you will get a roll off.

I assume they measure 28mm (outside dimension) when inflated. According to the Silca calculator (entering total weight as 170#), the starting pressures are rear at 77.5psi, and the front at 75.5. Those are starting points. I bet you could safely take 10% off those pressures, and bring them down into he low 70s, but 60 seems awful low.
Badger6 is offline  
Old 04-27-21, 12:17 AM
  #3  
HTupolev
Senior Member
 
Join Date: Apr 2015
Location: Seattle
Posts: 4,148
Mentioned: 41 Post(s)
Tagged: 0 Thread(s)
Quoted: 1912 Post(s)
Liked 1,191 Times in 576 Posts
Originally Posted by Symox View Post
I know there is no definitive answer to this but I'd like your input nonetheless...

I weigh 155lbs, bike is around 17lbs (probably less but haven't checked). I ride on tarmac only (dry or wet) and use 28mm Continental Gatorskins (yeah I know some hate 'em - I think they are fine for my needs) with Mavic Open Pro rims.

I used to ride at max pressure until reading on this very forum how lower pressures can help ride quality. Well the lower pressures certainly have. I have found that if I run 60psi on the front and 70psi on the rear I get excellent traction, comfort and no pinch flats (knock on wood). (most importantly, the bike isn't twitchy on fast downhills like it usually is at 110psi).

So, am I asking for trouble at these lowish pressures? I don't think its possible for the tire to dislodge from the rim as it is friggin' hard to remove the tires from the rim in the first place but that is one of my concerns

Thanks for your insight and/or recommendations
You're probably fine in terms of tire security. Low pressures generally aren't where blow-offs occur, and rolling a loose tire is largely a phenomenon that happens after a flat.

I also don't think you're really pushing the limits in terms of sidewall damage from excessive deformation.

If you aren't suffering pinch flats, then you're probably fine.
HTupolev is online now  
Likes For HTupolev:
Old 04-27-21, 03:00 AM
  #4  
ooga-booga
lead on, macduff!
 
ooga-booga's Avatar
 
Join Date: Apr 2009
Location: insane diego, california
Posts: 7,767

Bikes: 85 pinarello treviso steel, 88 nishiki olympic steel. 95 look kg 131 carbon, 11 trek madone 5.2 carbon

Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1471 Post(s)
Liked 2,571 Times in 1,410 Posts
do people still ride '28's? asking for a friend.
ooga-booga is offline  
Old 04-27-21, 05:19 AM
  #5  
Ghazmh
Senior Member
 
Ghazmh's Avatar
 
Join Date: Jan 2014
Location: The banks of the River Charles
Posts: 1,951

Bikes: 2022 Salsa Beargrease, 2020 Seven Evergreen, 2019 Honey Allroads Ti, 2018 Seven Redsky XX, 2017 Trek Boon 7, 2014 Trek 520

Mentioned: 18 Post(s)
Tagged: 0 Thread(s)
Quoted: 663 Post(s)
Liked 811 Times in 446 Posts
Originally Posted by ooga-booga View Post
do people still ride '28's? asking for a friend.
Wait, are we going back to 23’s?
Ghazmh is offline  
Old 04-27-21, 05:24 AM
  #6  
ooga-booga
lead on, macduff!
 
ooga-booga's Avatar
 
Join Date: Apr 2009
Location: insane diego, california
Posts: 7,767

Bikes: 85 pinarello treviso steel, 88 nishiki olympic steel. 95 look kg 131 carbon, 11 trek madone 5.2 carbon

Mentioned: 25 Post(s)
Tagged: 0 Thread(s)
Quoted: 1471 Post(s)
Liked 2,571 Times in 1,410 Posts
^hopefully not. may ye all continue to pay more for '28's since it's the cool kid and ride "faster." knock thyselves out.
ooga-booga is offline  
Old 04-27-21, 05:48 AM
  #7  
eduskator
Senior Member
 
eduskator's Avatar
 
Join Date: Aug 2019
Location: Québec, Canada
Posts: 1,379

Bikes: TCR Pro, Revolt Adv

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 591 Post(s)
Liked 336 Times in 259 Posts
Originally Posted by Symox View Post
I know there is no definitive answer to this but I'd like your input nonetheless...

I weigh 155lbs, bike is around 17lbs (probably less but haven't checked). I ride on tarmac only (dry or wet) and use 28mm Continental Gatorskins (yeah I know some hate 'em - I think they are fine for my needs) with Mavic Open Pro rims.

I used to ride at max pressure until reading on this very forum how lower pressures can help ride quality. Well the lower pressures certainly have. I have found that if I run 60psi on the front and 70psi on the rear I get excellent traction, comfort and no pinch flats (knock on wood). (most importantly, the bike isn't twitchy on fast downhills like it usually is at 110psi).

So, am I asking for trouble at these lowish pressures? I don't think its possible for the tire to dislodge from the rim as it is friggin' hard to remove the tires from the rim in the first place but that is one of my concerns

Thanks for your insight and/or recommendations
Is your setup tubeless or are you using inner tubes? If tubeless, you should be good IMO.

I am 180lbs, running 28mm TL tires on 19.4mm internal width hookless rims and I run 68PSI front & 70PSI rear (ish).
eduskator is offline  
Likes For eduskator:
Old 04-27-21, 06:23 AM
  #8  
rm -rf
don't try this at home.
 
rm -rf's Avatar
 
Join Date: Jan 2006
Location: N. KY
Posts: 5,624
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 857 Post(s)
Liked 276 Times in 202 Posts
Pinch flats
It's a combination of speed and the shape of the rock or pothole. I've gotten a few pinch flats on downhills, hitting a large chunk of sharp edged gravel that had been kicked out onto an otherwise smooth road.
At moderate speeds, the tire would have bounced over those rocks with no problems.
Moderately deep, rounded edge potholes are way less of a problem than very deep or sharp edged potholes.

Pressures
I've since raised the tire pressure 5 or 8 psi. But I do wonder if that small change makes much difference in getting the pinch flat!
At 170 pounds, I'm running GP5000 at 65-68 front and 78-80 rear psi on 28mm tires with wider rims, 20.5 mm internal width.

More air volume in the tire allows lower pressures. So I have quite a bit more air volume than your narrow Open Pros. You could try a little more pressure on each wheel and see how it feels on rough roads, and go from there. When I raised my tire pressures to my current setup, it still had similar rough road comfort.

(It must be an amazing change if you were running 110 psi on 28s! Rock hard.)

Last edited by rm -rf; 04-27-21 at 06:29 AM.
rm -rf is offline  
Old 04-27-21, 06:27 AM
  #9  
datlas 
Should Be More Popular
 
datlas's Avatar
 
Join Date: Dec 2007
Location: Malvern, PA (20 miles West of Philly)
Posts: 39,932

Bikes: 1986 Alpine (steel road bike), 2009 Ti Habenero, 2013 Specialized Roubaix

Mentioned: 539 Post(s)
Tagged: 2 Thread(s)
Quoted: 19594 Post(s)
Liked 6,245 Times in 3,024 Posts
I think you are ok but slight risk of pinch flats. It really depends on your roads, if it were me I would go to 65-70F and 75R. But go with what works best for your situation.
__________________
Originally Posted by rjones28 View Post
Addiction is all about class.
datlas is offline  
Old 04-27-21, 06:34 AM
  #10  
WhyFi
Senior Member
 
WhyFi's Avatar
 
Join Date: Jan 2010
Location: TC, MN
Posts: 39,330

Bikes: R3 Disc, Haanjo

Mentioned: 353 Post(s)
Tagged: 1 Thread(s)
Quoted: 20610 Post(s)
Liked 9,280 Times in 4,595 Posts
If these pressures have worked well in practice, why worry about what others think might in theory? If they're not squirming when you corner and you're not getting that "wait... do I have a flat?" bounce when you pedal, you're probably fine.

FWIW, I run a little over 60psi on the rear and a little under 60psi up front... but I'm 30lbs heavier, have 23mm int width rims, run tubeless, have more supple tires, etc, etc. Regardless, I don't think that your 60F/70R is out of the range of sensibility.
WhyFi is offline  
Likes For WhyFi:
Old 04-27-21, 07:22 AM
  #11  
DaveSSS 
Senior Member
 
Join Date: Sep 2008
Location: Loveland, CO
Posts: 6,936

Bikes: Cinelli superstar disc, two Yoeleo R12

Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 916 Post(s)
Liked 476 Times in 383 Posts
Most tire pressure calculators only recommend 2-5 psi more for the rear. Rim internal width also matters. Last year I ran what I thought was 80 psi with 25mm tires on 17mm internal width rims and got two pinch flats from not very large rocks. I only weigh 135-140. It also turns out that my pump gauge was off and I really only had 72 psi in the tires. Gauges are often inaccurate. I now have a new 0-100 psi liquid filled gauge with a much larger face so it's easier to read.
DaveSSS is offline  
Old 04-27-21, 07:46 AM
  #12  
msu2001la
Senior Member
 
msu2001la's Avatar
 
Join Date: Mar 2006
Location: Midwest
Posts: 2,318
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
Quoted: 1114 Post(s)
Liked 1,114 Times in 659 Posts
I have never heard of a clincher tire coming off the rim because someone was running too low PSI. I suppose it's possible, but unless you're trying to ride a completely flat tire I don't see how this would be a common problem.

I think the only risk here is potentially more chance of pinch flatting.
msu2001la is offline  
Likes For msu2001la:
Old 04-27-21, 08:37 AM
  #13  
eduskator
Senior Member
 
eduskator's Avatar
 
Join Date: Aug 2019
Location: Québec, Canada
Posts: 1,379

Bikes: TCR Pro, Revolt Adv

Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 591 Post(s)
Liked 336 Times in 259 Posts
Originally Posted by DaveSSS View Post
Most tire pressure calculators only recommend 2-5 psi more for the rear. Rim internal width also matters. Last year I ran what I thought was 80 psi with 25mm tires on 17mm internal width rims and got two pinch flats from not very large rocks. I only weigh 135-140. It also turns out that my pump gauge was off and I really only had 72 psi in the tires. Gauges are often inaccurate. I now have a new 0-100 psi liquid filled gauge with a much larger face so it's easier to read.
+1 on that. I tried a few combination (65F/70R, 69F/70R and 70F&R) and I'm good at 68/70. Even 70/70 is OK. My hands don't mind extra stiffness, but my arse likes it as soft as possible.
eduskator is offline  
Likes For eduskator:
Old 04-27-21, 10:07 AM
  #14  
Iride01 
more daylight today!
 
Iride01's Avatar
 
Join Date: Jul 2017
Location: Mississippi
Posts: 12,236

Bikes: Tarmac Disc Comp Di2 - 2020

Mentioned: 43 Post(s)
Tagged: 0 Thread(s)
Quoted: 5011 Post(s)
Liked 3,520 Times in 2,443 Posts
If you get pinch flats, then put more air in or avoid the places that make you pinch flat.

Is that the right pressure for you? Trust what your legs and data show you for the same ride, multiple times at differing PSI for six to a dozen times each.
Iride01 is offline  
Old 04-27-21, 09:05 PM
  #15  
Symox
Senior Member
Thread Starter
 
Join Date: Jul 2020
Posts: 651

Bikes: '07 Specialized Roubaix Comp Triple, '12 Gravity Fixie, '21 Liv Rove 4, '06? Giant EB Spirit

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 334 Post(s)
Liked 213 Times in 135 Posts
Originally Posted by eduskator View Post
Is your setup tubeless or are you using inner tubes? If tubeless, you should be good IMO.

I am 180lbs, running 28mm TL tires on 19.4mm internal width hookless rims and I run 68PSI front & 70PSI rear (ish).
No it is tubed foldable clincher. I'm finding 65psi front 75psi rear to be my sweet spot
Symox is offline  
Old 04-27-21, 09:19 PM
  #16  
cxwrench
Senior Member
 
cxwrench's Avatar
 
Join Date: Jul 2013
Location: Nor-Cal
Posts: 3,767

Bikes: lots

Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 1954 Post(s)
Liked 2,925 Times in 1,488 Posts
If it works for you it works for me. I've always felt that I will run the pressure that feels good and not worry at all about pinch flats. If I get one once or twice a year so be it, but I will like my tire pressure the other 99.9% of the time.
cxwrench is offline  
Likes For cxwrench:
Old 04-27-21, 09:38 PM
  #17  
Joearch
Junior Member
 
Join Date: Jun 2020
Location: Los Angeles
Posts: 143

Bikes: Bianchi Infinito CV Disc Ultegra

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 45 Post(s)
Liked 53 Times in 28 Posts
I am 170lbs and find that my 28’s w tubes feel good at 78r and 72f.
Joearch is offline  
Likes For Joearch:
Old 04-28-21, 07:31 AM
  #18  
phrantic09
Fat n slow
 
Join Date: Oct 2013
Location: Saratoga, NY
Posts: 3,519

Bikes: Cervelo R3, Giant Revolt

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 2624 Post(s)
Liked 1,599 Times in 757 Posts
Originally Posted by Symox View Post
No it is tubed foldable clincher. I'm finding 65psi front 75psi rear to be my sweet spot
I don’t know if I’d do it in a tubed tire, but I run 60/65 on 28mm tubeless tires with 19 internal width at 170# just fine
phrantic09 is offline  
Old 04-28-21, 09:09 PM
  #19  
Symox
Senior Member
Thread Starter
 
Join Date: Jul 2020
Posts: 651

Bikes: '07 Specialized Roubaix Comp Triple, '12 Gravity Fixie, '21 Liv Rove 4, '06? Giant EB Spirit

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 334 Post(s)
Liked 213 Times in 135 Posts
I am finding 65psi Front and 85psi rear is working great.
Symox is offline  
Old 04-29-21, 01:12 AM
  #20  
Parkyy16
Senior Member
 
Join Date: Oct 2013
Location: Texas
Posts: 92

Bikes: All steel... Breadwinner, Ritchey, Soma, VO, etc.

Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 56 Post(s)
Liked 36 Times in 25 Posts
At your weight, and choice of tire, 65psi front and rear should be fine. I used to run 32mm gatorskins on a commuter, usually ran 65psi front and back, never had a pinch flat.

I'm running 80psi both front and rear on my 28mm on 21mm ID rims; they're about 30mm when pumped up. I've tried all variations from 60 - 90 psi front and back, found 65 front and 75 rear to be the most comfortable in most conditions, but my city is doing a lot more road work recently, so I upped the pressure a bit to prevent pinch flats and/or bottoming out my carbon rims on some pretty bad potholes caused by the construction traffic.

Currently at 165lbs, 5'9". I'm running Hutchinson Fusion 5 28mm tires with regular butyl tubes.
Parkyy16 is offline  
Likes For Parkyy16:
Old 04-29-21, 06:32 AM
  #21  
Kabuki12
Senior Member
 
Join Date: Jan 2016
Posts: 2,681
Mentioned: 30 Post(s)
Tagged: 0 Thread(s)
Quoted: 640 Post(s)
Liked 1,464 Times in 859 Posts
I like 28’s and run them on a few of my bikes. I am about 155lbs and ride vintage steel bikes so some have 27” x 1” wide tires. Our roads are really bad in some places and I run 80 in the front and 95 on the back tire. I ride two to three times a week and only get a couple of flats a year from thorns. I have one bike that I run 27” x 1 1/4” Michelin ProTek but I still put 80/ 90lbs in those.
Kabuki12 is offline  
Old 04-29-21, 10:34 AM
  #22  
xroadcharlie
Full Member
 
Join Date: Apr 2019
Location: Windsor Ontario, Canada
Posts: 469

Bikes: 2018 Giant Sedona

Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 151 Post(s)
Liked 99 Times in 83 Posts
According to an online calculator you should run 60 psi front and 75 rear. But I question the logic behind lower front tire pressure with 28 mm tires that have very little room for error. The problem is when you hit a pothole or big shift on cement the full weight of the bike drives the soft front tire into the sharp edge, resulting in a pinch flat.I might run 68 psi front and 75 rear for a little extra insurance.

These are a good place to start IMO. Tires with a stiffer side wall, Like the cheap Kenda's on my comfort bike require less pressure, the more supple sidewalls on a good tire the same size may require slightly more.

With the 50mm tires on my comfort bike, I run 30 - 35 front and 40 - 47 rear. But those 50mm tires have a lot more room before a pinch flat then 28mm do.

Last edited by xroadcharlie; 04-29-21 at 10:44 AM.
xroadcharlie is offline  
Old 04-30-21, 10:52 AM
  #23  
ZHVelo
Senior Member
 
Join Date: Apr 2020
Location: Zurich, Switzerland
Posts: 824
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 489 Post(s)
Liked 221 Times in 154 Posts
On my GP5000s I am in the low 60s (28mm). Doesn't seem to be an issue. But generally roads are good here.
ZHVelo is offline  
Likes For ZHVelo:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell or Share My Personal Information -

Copyright © 2023 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.