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right tyre pressure

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  • August 5, 2013 at 10:14 pm #19546
    Shanefutcher

    Hi I’ve been riding for about 2 years now and always have my tyre pressure at 105psi.should I have more in there

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  • August 13, 2013 at 10:46 am #751071
    0
    700c

    Calculator is all well and
    Calculator is all well and good if you have decent tyres which will handle , for example, 140 psi on the rear, but when that exceeds the manufacturers recommendation, or even that specified for the rim, it’s probably not a good idea

    Handmade tubular type with high thread count will work, but not much else

    And no, I don’t think going up to a bulging 25 or 28 is what I want to do when I’ve spent loads on an aero wheelset!

    Still,, seems to justify my high pressures for the rear, though says my front needs to be reduced

    August 12, 2013 at 10:31 pm #751069
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    paulfg42

    I’m bemused by the science
    I’m bemused by the science and the calculator. 🙁

    I currently inflate both tyres to 90. What am I doing wrong?

    August 11, 2013 at 6:30 pm #751067
    0
    Sensible

    I am 86 kg and have an 8kg
    I am 86 kg and have an 8kg Giant TCR Advanced. I have 23c Giant P-SLR 1 tyres. (Giants top tyres with different compound front and rear) The max pressure is 120psi and I have been running at 110 psi. A few months ago I came off the bike in the wet when the rear end slid away from me. Still recovering from a wrist injury. Are my tyre pressures too high?

    August 11, 2013 at 6:22 pm #751065
    0
    Sensible

    Shanefutcher wrote:It says

    Shanefutcher wrote:
    It says that you should change the tyres.i slid off my bike with giant p-slr tyres and think they’re awful in wet conditions

    What is it that says I should change my tyres?

    I have only done 800 miles on them and they are almost worn down to the indicator, so will change them in the next few months anyway. Going to get Conti GP 4000S, having seen good reviews.

    I have just worked out what my pressures should be using the 15% drop chart. It saysvI should have my front at 90 and my rear at 140. Considering tge max is 120 I wont be going to 140.

    August 10, 2013 at 6:20 pm #751063
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    Shanefutcher

    It says that you should
    It says that you should change the tyres.i slid off my bike with giant p-slr tyres and think they’re awful in wet conditions

    August 9, 2013 at 8:25 pm #751061
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    BBB

    Hector Ch wrote:According to

    Hector Ch wrote:
    According to that, I’m supposed to have 9.5 Bar in my tyres. Only problem is, my Conti 4000 S tyres say max pressure of 8.5 bar…

    Wonderful…

    What this is clearly telling you is that you need wider tyres.

    August 9, 2013 at 2:35 pm #751059
    0
    Mr Will

    Here’s an online calculator
    Here’s an online calculator based on the 15% drop method: http://www.dorkypantsr.us/bike-tire-pressure-calculator.html

    Works well IME

    August 8, 2013 at 6:29 pm #751057
    0
    Hector Ch

    According to that, I’m
    According to that, I’m supposed to have 9.5 Bar in my tyres. Only problem is, my Conti 4000 S tyres say max pressure of 8.5 bar…

    Wonderful…

    August 8, 2013 at 2:10 pm #751055
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    goldtop

    BBB wrote:KiwiMike wrote:NO.

    BBB wrote:
    KiwiMike wrote:
    NO. Not unless you are on 23c’s and weigh 100kg. Follow this PDF, it’s science. Anyone else is wrong.
    http://www.bikequarterly.com/images/TireDrop.pdf
    Your arse, hands and times will thank you.

    +1

    That’s definitely the best method available, at least as a starting point but it seems like science isn’t very much in nowadays 😉

    Please stop blindly following manufacturers’ recommendations people.

    As a roadie noob I can also say I feel more comfortable following the pressures in this guide and haven’t noticed any loss in speed.

    The difference when applying the drop to my Bad Boy is much more pronounced and was a bit of a revelation for me. Much smoother and noticeably quicker than using mfrs recommended pressures!

    August 7, 2013 at 10:49 pm #751053
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    BBB

    KiwiMike wrote:NO. Not unless

    KiwiMike wrote:
    NO. Not unless you are on 23c’s and weigh 100kg. Follow this PDF, it’s science. Anyone else is wrong.
    http://www.bikequarterly.com/images/TireDrop.pdf
    Your arse, hands and times will thank you.

    +1

    That’s definitely the best method available, at least as a starting point but it seems like science isn’t very much in nowadays 😉

    Please stop blindly following manufacturers’ recommendations people.

    August 7, 2013 at 1:10 pm #751051
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    Simon E

    Al, I’d suggest your
    Al, I’d suggest your pressures sounds about about right for your weight. You and Shane should try 10 psi either side of what you run now and see how it feels, establish what suits you.

    August 6, 2013 at 10:09 pm #751049
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    pdows47

    Get the Vittoria Ityre
    Get the Vittoria Ityre pressure app, gives you ideal pressure based on the tyre and conditions. It is intended to work with vittoria tyres, but you can get it to work pretty well for other brands

    August 6, 2013 at 8:54 pm #751047
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    Al'76

    Hi KiwiMike,
    According to
    Hi KiwiMike,
    According to this I’m running my tyres with way too much pressure; combined weight of rider and bike is around 79kgs and, on 23mmm tyres, I run 100psi in the front and 110psi in the rear. Manufacturer recommends 115 to 125psi, so I’m below that already. Any idea why the manufacturer specifies such high pressures?

    August 6, 2013 at 11:14 am #751045
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    spongebob

    Vittoria do an app for their
    Vittoria do an app for their tyres, I think on the open corsa I ended up running 120/115 in dry smooth conditions and 5-10 lower in wet/rough

    August 6, 2013 at 11:12 am #751043
    0
    therevokid

    KiwiMike

    KiwiMike wrote:

    http://www.bikequarterly.com/images/TireDrop.pdf

    Read this, worked out what my bike would need …… and
    found the front would be below manufacturers recommended
    minimum (rear is just on the limit !!)

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