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Tyre pressures [message #289597] Wed, 22 April 2015 11:32 Go to next message
Kermit is currently offline  Kermit   United Kingdom
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(22) Giacomo Agostini
Going to get new tyres for the blade soon but think I can eek out another 500 miles on the current ones (Racetec Ksomething road compound) but despite us probably covering tyre pressures on here dozens of times over the years I'm still not sure what are good pressures for the road.

I know on track most people drop from 36/42psi to 30/36 or even less but what about on the road assuming short rides (20-30mins), commuting, temps 15-20C with opportunities along the way to let the bike off the leash?

at the mo I run approx 35/40 with my 120/190's so just a tad under book pressure mostly as I'm allowing for the fact its not freezing cold (not when I ride anyway Blush ), dry and I don't have to allow for a pillion but don't have a lot of confidence in the front but possibly thats more me being out of the saddle for 6 months than any degree of Rossi/Marquez understanding of what the front is actually doing Sad

[Updated on: Wed, 22 April 2015 11:37]

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Re: Tyre pressures [message #289600 is a reply to message #289597] Wed, 22 April 2015 12:44 Go to previous messageGo to next message
Kakugo is currently offline  Kakugo   Italy
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(18) Geoff Duke
All modern tyres are designed to work on the road according to manufacturers' specs, which are now all pretty much the same (36/42 psi apart from some heavier bikes requiring 42 psi front pressure). There's no need to experiment.

Track pressures are another matter completely. Just to give an example most last two generations Michelin's run at 2.1bar front and 1.9bar or even 1.5bar rear depending on track temperature. Yes, the rear is a measly 1.5 if temperature is above 15C. eek
Re: Tyre pressures [message #289602 is a reply to message #289600] Wed, 22 April 2015 16:03 Go to previous messageGo to next message
Kermit is currently offline  Kermit   United Kingdom
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(22) Giacomo Agostini

PSI or BAR[ 8 votes ]
1. I think and work in PSI 6 / 75%
2. I think and work in BAR 0 / 0%
3. I'm ambidextrous and can use either 2 / 25%

Your probably right although I will hold out for others views and what they run to get a general opinion given pressure is temperature dependant as shown by on track generally lower track pressures being run and while I don't treat the road as a track, I think in general my tyres get more of a work out and heat into them than the average biker I see commuting to work or taking it steady on back roads.

re BAR, don't know why it is but like with MPH, PSI is one the last measurements were I can't get used to Euro/Metric units. Bar of course makes more sense as I know (I think) 1 BAR = atmospheric pressure, 2 BAR is 2 atmospheres and so on and these days never think in terms of pounds for weight (Stones maybe) or hardly ever inches for length (apart from ahem RollEyes ) but when it comes to tyre pressures charts I also skip straight to the PSI value.

[Updated on: Wed, 22 April 2015 16:12]

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Re: Tyre pressures [message #289612 is a reply to message #289602] Thu, 23 April 2015 07:06 Go to previous messageGo to next message
gone2 is currently offline  gone2   Netherlands
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(15) Kenny Roberts
For road, all year round I use 2.2bar front (32.3psi) and 2.5 rear (37psi). Never the slightest whiff of an unwanted slide, but to be fair I only lean as far as necessary to get rid of the chicken strips on the back, I still have 1 cm chicken strip on the front. And don't plan to reduce it. On track that would drop to 2 (29)front, 2.2 (32.3) rear. That's using rubber like Pilot power or Pirelli DRC's. I did once get an almighty highside on track when I put 2.7bar into the rear on a Metzeler K3. Dunno whether it was the contact patch was too small or the tyre couldn't build up enough heat.

[Updated on: Thu, 23 April 2015 07:09]

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Re: Tyre pressures [message #289613 is a reply to message #289612] Thu, 23 April 2015 09:06 Go to previous messageGo to next message
Swiss T   United Kingdom
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(16) Barry Sheene
I think it somewhat depends on the tyre. I find (& have read somewhere) that B Stone & D Lop have a stiffer carcass than Mich & Pir & so respond to lower pressures in different ways (Road tyres).

Last year I fitted a set of Mich PR3 to my Blade with a 55 rear & cannot recommend them highly enough; amazing feel on the road & I would even take them to a trackday. I run with 34F & 38R with these tyres.

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Re: Tyre pressures [message #289749 is a reply to message #289613] Thu, 30 April 2015 11:25 Go to previous message
RWB929 is currently offline  RWB929   United Kingdom
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(13) MotoGP Champion
I'm using an old set of supercorsa's left over from TD's and a set of Michelin 2ct's, run both these at 34F / 38R on the road, but I do tend to only ride in the dry nowadays so have no need to worry about lower pressure effecting water dispersal properties.

Ps: On track I run the Supercorsa's at 27F / 30R hot temps..
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