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

[cunn1n9]

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


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[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]

Pretty big variation all round

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

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

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

[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.

[pdlpsher1]

Thinking 90/85 or 85/80 for first ride

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]

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

[jlok]

Was 73kg running Fusion 5 Perf TLR 28c 55f/60r psi on 25mm int width rims.

[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.

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

[nycebo]

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

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:

[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?

[welchy]

S Works Turbo Cottons

90KG

85/80 PSI Training
95/90 PSI Race

[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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[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.

[rides4beer]

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.