What pressures are you running your 28mm's at?

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cunn1n9
Posts: 147
Joined: Sat Jan 15, 2011 1:24 am

by cunn1n9

I weigh 76kg. Run 28mm tyres at 60/65psi. Love it.


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by Weenie


backdoor
Posts: 22
Joined: Tue May 21, 2019 9:54 pm

by backdoor

85-86kg here and running 28mm Grand Sports on a set of 25mm wide Belgium+ rims. Th wider rims make a difference.

I run them at 85psi front, 90psi rear. Mostly run on chip seal. I've tried running them lower (down to 65) but it's a noticeably slower cadence or tougher pedal on long rides at my weight with the lower air pressure.

I will set em up at 90/95 and by the end of the week they are ~75/80 and I air them up again.

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Shrike
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Joined: Fri Jun 03, 2016 5:08 pm

by Shrike

Pretty big variation all round :shock:

I have a big ride on Thursday and no chance to test these before then so hoping to get it right. Some really scary, steep, windy and narrow descents that I don't know, so don't want them being squirmy. Also don't want them feeling 'bouncy' hitting rough stuff on the descents either.

Thinking 90/85 or 85/80 for first ride :idea:

But that's what I was running the 25's at really..

Rims are Campag Zonda disc brakes.. 22mm I think.

MisterNoChain
Posts: 177
Joined: Sun Nov 13, 2011 9:29 pm
Location: Belgium

by MisterNoChain

You can always leave some air out during the ride

As said it's also about the tire. I have Corsa and p zero in 25 (both measuring +27mm). On the corsa I go for 60 psi while on the p zero it's 70 psi. I weigh 65kg. When I go too low on the front the steering can feel a bit vague.
I also have Corsa in 28 but they measure practicly the same as the 25 on my rims.



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pdlpsher1
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Location: CO

by pdlpsher1

Shrike wrote: Thinking 90/85 or 85/80 for first ride :idea:

But that's what I was running the 25's at really...
Makes no sense. When you go up a tire size you need to drop pressure not increase pressure. You should drop 5-10psi. Try 80 front 85 rear and adjust down if needed.


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Shrike
Posts: 1632
Joined: Fri Jun 03, 2016 5:08 pm

by Shrike

Yeah exactly, should be running lower pressures going up a size. Just have some hangup about squirmy tyres and pinch flats. Alright will try 85/80 and see how it goes :P

jlok
Posts: 1044
Joined: Tue Jun 30, 2015 3:30 am

by jlok

Was 73kg running Fusion 5 Perf TLR 28c 55f/60r psi on 25mm int width rims.
Litespeed T1sl Disc / BMC TM02 < Giant Propel Advanced SL Disc 1 < Propel Adv < TCR Adv SL Disc < KTM Revelator Sky < CAAD 12 Disc < Domane S Disc < Alize < CAAD 10

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nycebo
Posts: 127
Joined: Fri Nov 13, 2009 8:04 pm
Location: New York, NY

by nycebo

I'm 2 kg heavier than you but run very similar pressure. 60 psi up front and 65-70 psi in back. Running it on Enve 5.6 Disc, Continental GP4000s2 28mm and Latex tubes...and yes, I have to refill every morning.

Good feel, good traction, good comfort and still seemingly very good rolling resistance on these tri-state roads.
cunn1n9 wrote:
Tue Aug 06, 2019 5:04 am
I weigh 76kg. Run 28mm tyres at 60/65psi. Love it.
Last edited by nycebo on Tue Aug 06, 2019 2:53 pm, edited 1 time in total.

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nycebo
Posts: 127
Joined: Fri Nov 13, 2009 8:04 pm
Location: New York, NY

by nycebo

Shrike wrote:
Tue Aug 06, 2019 9:50 am
Yeah exactly, should be running lower pressures going up a size. Just have some hangup about squirmy tyres and pinch flats. Alright will try 85/80 and see how it goes :P
Good choice. It should not be squirmy. But, you didn't provide your weight, so who knows.

For points of comparison, check out this table from Enve's site:
Attachments
Enve Pressure.JPG

kode54
Posts: 1608
Joined: Tue May 23, 2006 9:39 pm

by kode54

also, depends on tubed or tubeless. above chart is based on tubeless.

68kg, 28mm tires on 25mm wide rims...55 psi. tubeless.
80-85 psi on tubed tires.

also, my front tire loses air much more often than the rear overnight. does this mean that I need to top up some more sealant in the front tire?
- Factor 02 Disc + DA9170 + Enve 4.5AR CK CL hubs
- Moots Vamoots Disc RSL Titanium + DA9170 + Enve 3.4AR CK CL hubs
- Parlee Altum + DA9150 + Enve SES 4.5 Ene carbon hubs
- Argonaut Spacebike 2.0 + DA9170 + Enve SES 5.6 DT Swiss 240 CL hubs

welchy
Posts: 263
Joined: Wed Jul 01, 2015 4:04 pm

by welchy

S Works Turbo Cottons

90KG

85/80 PSI Training
95/90 PSI Race

Multebear
Posts: 1318
Joined: Sat May 02, 2015 10:11 pm

by Multebear

It really doesn´t make sense, to move to wider tires, if you don´t want a more comfortable ride. This means, if you run the same pressure as before with narrower tires, you don´t really get any advantage. You just get a heavier tire than before. I´m aware, that the air chamber is bigger, which gives you marginally more comfortable ride than with 25 mm, but nothing of any importance.

There´s no need to go wider, if you don´t drop the pressure. AND if you drop the pressure, you might as well go significantly lower. I run my 32 mm with 2.8 bars (40 psi). I´m 90 kg. I ride all sorts of rides with those tires. Gravel, road, mountains, mountain descents e.g. Those rare occassions I run 28 mm, I´m doing 3.5 bars (50 psi). With wider tires you get better grip, especially when riding lower pressure.

But riding 80ish psi with 28 mm tires, IMHO that´s just totally missing the point of going wider. Might as well just go 23 mm and stay there. It´s faster and lighter. Don´t jump on the marketing BS about wider being faster.

Multebear
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Joined: Sat May 02, 2015 10:11 pm

by Multebear

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guyc
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Location: Hampshire, England
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by guyc

Tubed (Turbo Cottons with Latex tubes)

83kg

Front 80/Rear 85psi

And I most definitely want a more comfortable ride with the shitty roads around here.

by Weenie


rides4beer
Posts: 172
Joined: Wed Nov 28, 2018 5:27 am
Location: SC

by rides4beer

Multebear wrote:
Wed Aug 07, 2019 12:51 pm
It really doesn´t make sense, to move to wider tires, if you don´t want a more comfortable ride. This means, if you run the same pressure as before with narrower tires, you don´t really get any advantage. You just get a heavier tire than before. I´m aware, that the air chamber is bigger, which gives you marginally more comfortable ride than with 25 mm, but nothing of any importance.

There´s no need to go wider, if you don´t drop the pressure. AND if you drop the pressure, you might as well go significantly lower. I run my 32 mm with 2.8 bars (40 psi). I´m 90 kg. I ride all sorts of rides with those tires. Gravel, road, mountains, mountain descents e.g. Those rare occassions I run 28 mm, I´m doing 3.5 bars (50 psi). With wider tires you get better grip, especially when riding lower pressure.

But riding 80ish psi with 28 mm tires, IMHO that´s just totally missing the point of going wider. Might as well just go 23 mm and stay there. It´s faster and lighter. Don´t jump on the marketing BS about wider being faster.
Are you running tubes or tubeless? I just mounted up a set of 28mm GP5Ks on my road bike, they measure at 30mm with the 21c rims. I've been running 80/90 on the same tires on my other bike (10psi lower than what I run on tires that measure about 27mm), I'll try going a lil lower and see how it feels.

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