Tyre pressure opinions please.

Discuss light weight issues concerning road bikes & parts.
JScycle
Posts: 225
Joined: Wed Mar 08, 2017 11:41 pm

by JScycle

Im riding Continental GP4000SII in 25mm. They measure out to approximately 28mm.
I am 67kg, bike is 7.3kg (sorry WW), other gear would proably be a kilo.
What is the ideal tyre pressure I should be running?
I currently use 90 front 95 rear

by Weenie


Geoff
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Joined: Sat Dec 13, 2003 2:25 am
Location: Canada

by Geoff

Sounds pretty good to me.

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boysa
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Joined: Sun May 04, 2008 10:03 pm
Location: Too far from my bike.

by boysa

I would think you could go lower, but it is all about what feels best to you.
"Deserve's got nothing to do with it." William Munny

shimmeD
Posts: 440
Joined: Thu Jun 28, 2012 10:52 pm
Location: eNZed

by shimmeD

:thumbup: all as above

+ read this at CyclingTips https://cyclingtips.com/2017/05/what-is ... ressure-2/
I love it, it is so weight weenies :wink: less is better
Last edited by shimmeD on Thu May 18, 2017 5:51 am, edited 2 times in total.
Less is more.

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mogwaiboi
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Location: Melbourne, Australia

by mogwaiboi

I'm 73kg, bike is around 7.4kg with HED Ardennes + and Vittoria Corsa 25c. I'd say mine would measure around 28mm and I currently run 65psi rear / 60psi front.
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Mr.Gib
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by Mr.Gib

That is impressively low psi. I find if I go below 80 psi my tires deflect/displace too much in hard cornering. I am 80 kg though so that is a factor but still...

Using mostly 25 or 28 mm on various wider rims.
wheelsONfire wrote: When we ride disc brakes the whole deal of braking is just like a leaving a fart. It happens and then it's over. Nothing planned and nothing to get nervous for.

natefontaine
Posts: 272
Joined: Wed Mar 31, 2010 3:37 am

by natefontaine

55/60 = bliss (75kg, 7ishkg bike, 28mm tubs)

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Delorre
Posts: 966
Joined: Sat May 24, 2014 12:09 pm

by Delorre

JScycle wrote:Im riding Continental GP4000SII in 25mm. They measure out to approximately 28mm.
I am 67kg, bike is 7.3kg (sorry WW), other gear would proably be a kilo.
What is the ideal tyre pressure I should be running?
I currently use 90 front 95 rear


I wouldn't go lower on the front, otherwise, when out of the saddle, the front end tend to feel 'soft', as if there was a fork with 1 or 2 cm of travel.

sawyer
Posts: 4508
Joined: Fri Dec 15, 2006 7:45 pm
Location: Natovi Landing

by sawyer

Sounds about right ... if roads are very smooth and dry you could go up a bit, and the converse for crap and/or wet roads
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fh8425
Posts: 141
Joined: Fri Dec 04, 2015 3:20 pm

by fh8425

68kg, vittoria corsa 25C, 50 mm profile rims. 70 psi, it helps to damper the sometimes uneven road surface. Rides great !
Last edited by fh8425 on Fri May 19, 2017 1:31 pm, edited 1 time in total.

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nycebo
Posts: 78
Joined: Fri Nov 13, 2009 8:04 pm
Location: New York, NY

by nycebo

I'd go as low as you can until you bottom out on bumps and then increase 5 psi, 10 max. I'm 80kg and ride those exact tires on my bike at 75 psi front and 85 psi rear depending on road condition of where I'm riding. Spectacular feels and exceptional handling in the corners.

GothicCastle
Posts: 138
Joined: Mon Jul 04, 2016 1:52 am

by GothicCastle

Depends quite a bit on the wheel profile. I'm heavier than you and run those same tires on wheels with 20.5mm internal width. Generally I'm around 70 psi. The same wheels with 23c tires, I'll run around 80.

With narrower wheels, I'd increase the pressure proportionally.

totalcompactroad
Posts: 32
Joined: Tue Jan 31, 2017 11:12 pm

by totalcompactroad

I'm about 65kg, use about 65psi on 25c Vittoria corsa's (17mm internal rim)

Super smooth on the rubbish roads around here, haven't got any pinch punctures. Only time I notice them being squishy is in the back when climbing

jlok
Posts: 676
Joined: Tue Jun 30, 2015 3:30 am

by jlok

73kg, Schwalbe Pro One 25mm on 21mm internal width rims, running 65/75psi F/R.

I tried higher psi like 75/85 or even 80/90 but found that it's too much for the relatively rough road surfaces in HK.
Giant Propel Advanced SL Disc 1 < Propel Adv < TCR Adv SL Disc < KTM Revelator Sky < CAAD 12 Disc < Domane S Disc < Alize < CAAD 10

Marin
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Joined: Wed Jan 22, 2014 11:48 am
Location: Vienna Austria

by Marin

Tbh, ride quality on Conti Gp4k doesn't really improve with lower pressure, so run them as hard as you like. They're fast though.

by Weenie


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