Tyre Pressures

Mojo_666

ayamkampung wrote:

anyway you can use a tool to check those pressures ?

I use a topeak D2, I pump up my tyre with a track pump to approx 30psi as per the pumps gauge then attach the d2 and release air down to the pressure I want...it means I get the exact pressure each time and I can make better comparisons. I have been doing this for 8 weeks or so now, I used to just guess before and could never get a consistent grip or feel.

Jolly Swagman

15.5st, two weeks I decided to let the front and rear down - which I accidentally did, twat, to 10psi in the woods (2.1 tyres) and far outpaced the person I normally ride with in the mud and crap. Then we hit the paved road for back home and I am surprised I am not still out there, a bloody good work out though and I might use that ploy again when I am short on time for a quick session. So, I decided that if 32 psi is good enough for my car it is fine for the bike. Seems ok but I am not exactly going to be on the WC circuit any time soon.

mcnultycop

At 18.5 stone I run about 55psi in my Ritchey Z-Max Classics, which was advice from my LBS to avoid punctures. It has worked, I've not had a pinch puncture since doing this, and the teeth rattling is no worse than my old Type-R!

delcol

120psi front and rear.. less drag and roll faster,, but zero comfort,

d00m

delcol wrote:

120psi front and rear.. less drag and roll faster,, but zero comfort,

On a road bike right? I thought it was bone jarring running 70psi in my mtb road slicks

The Rookie

cooldad wrote:

I am about 14st and run around 30psi front, 35 rear, so what CWNT said a few posts up.

12stone, same pressures in winter (1.8's), run harder in summer when grip is easier to come by and speeds a little higher.

Simon

delcol

yep on road bike 23-700c roll fast zero drag but rattle the 5h1t out of you..

mtbs i tend to run 30-40 psi depending were i ride and time of year.

Northwind

Decrease pressure til you pinch flat, then pump back up a bit

The Rookie

delcol wrote:

yep on road bike 23-700c roll fast zero drag but rattle the 5h1t out of you..

On my commute (very rough surface - the road was 'top dressed' about 5 years ago and now 50% has worn away) I dropped my front (26x1.50) from 80 to 60 to take some 'sting' out of it, the rear runs at 80.

Simon

mercedism

Pumped mine up after reading this to 50 back and 45 front (well within manuf. specs). Never, ever again. Went and done a 25 mile round trip yesterday and still aching today, front felt like it was going to slip out all the time, felt every little bump. No fun whatsoever. Putting back to the low pressure and will be making little increments in future.

Also didn't feel i was any faster on flat road sections.

KacperN

My setup:

About 40psi on the back and around 35 on the front..

robertpb

This could be of interest http://mtb.ubiqyou.com/

Tested it against my various tyre sizes, setups, conditions etc and seemed not far out, usually within a couple of psi.

cooldad

robertpb wrote:

This could be of interest http://mtb.ubiqyou.com/

Tested it against my various tyre sizes, setups, conditions etc and seemed not far out, usually within a couple of psi.

I'm actually surprised - gave me 31/34, I normally run 30/35. Close enough.

mercedism

Thanks, nifty site. Gonna try a 31/34, not experienced rider but i like the sound of it better.

PaulC7

Ive just got...

27psi front 30psi rear

both are currently pumped upto 45psi

and the info on sidewall is between 45psi and 65psi

couldnt imagine what 65 is like nor would i want to try it... 45 is more than enough

Sprool

robertpb wrote:

This could be of interest http://mtb.ubiqyou.com/
Tested it against my various tyre sizes, setups, conditions etc and seemed not far out, usually within a couple of psi.

Now isn't that so much more helpful than those 'Depends on rider weight, tyre size, experience, terrain, full moon, sandwich flavour, favourite insect' or those 'try lots of stuff and see what you like best' answers?
People need a starting point guideline to work from.
Thanks Rob

The Northern Monkey

Lol... 18psi on the Canyon, but I have DH tubes and high volume tyres.

30psi on the 456.

Different bikes, different needs.

welshkev

I run around 40 psi on both my bikes. always have done. it may be a little bit more twitchy on the downs, but I prefer the lesser rolling resistance when I'm climbing - I need all the help I can get!!

rockmonkeysc

I run my xc tyres at 28psi front and rear. Just enough to keep the rim off the ground but still lets the tyre deform nicely for plenty of grip. I occasionally pump them up to 32psi for a long distance xc ride where I want less drag.
My downhill tyres are always at 25-28psi depending on track conditions.

Thewaylander

Yeh probably a bit below 25 psi here, but im fairly light

Lower is good until the tyre rolls IMO.

rockmonkeysc

I did read something about lower pressures rolling faster off road in most conditions.

Northwind

Yeah, definitely sometimes a soft tyre can be faster- can deform round things instead of bouncing over. Like suspension, in that regard. But I think it's all pretty damn complicated tbh.

chrisw333

Sprool wrote:

robertpb wrote:

This could be of interest http://mtb.ubiqyou.com/
Tested it against my various tyre sizes, setups, conditions etc and seemed not far out, usually within a couple of psi.

Now isn't that so much more helpful than those 'Depends on rider weight, tyre size, experience, terrain, full moon, sandwich flavour, favourite insect' or those 'try lots of stuff and see what you like best' answers?
People need a starting point guideline to work from.
Thanks Rob

These calculators are utter rubbish how can they possibly work?

It got mine to within 1psi of what I currently run front and rear!

welshkev

RockmonkeySC wrote:

I did read something about lower pressures rolling faster off road in most conditions.

I can understand that on descents or soft ground, but is that still the same on hardpack stuff like a fireroad?

cooldad

Doubt it, that's more like road riding. But over bumps, roots etc, especially climbing.

BloggingFit

I tend to run fairly low with tubeless - 22 front and 25 rear.

njee20

25ish both ends for me, bit less if it's wet.

Dayz

maybe my gauge reads wrong but Ive got just over 20 in the rear, just under 20 on the front, although I only weigh 70kg... very rarely ding the rim, only if i get a fast gap or drop wrong or hit a large unsighted root or rock...