Tyre pressures?

[sapperj]

Having recently returned to bikes as primary transport, I am unsure what preasure to run.
My previous experiance with cars has left me unsure if the same 'rule of thumb' applies. For example my Holden Commodore has factory fitted 17" and recomended 28psi, yet thr tyre shop and various others advize 36F 34R, handles well and tyre wear is even (regular rotations etc) and primarily used on open road, mid to long distance trips.

So should I up my preasures on my bike? Most of my riding is welly - palmy etc, not around town.

Cheers all

[frogfeaturesFZR]

Was running 38 psi back, and 34 psi front on my FZR 400 ( Pirelli Sport Demons ), I weigh 90 kg's

[Sensei]

Your Holden if 235/45/17 should be a min of 38psi all round , run my 235/45/18 at 40psi cold . As far as bike pressures go it up to what you like & how the bike feels but as a baseline 36F/38R . Aprilia's with Oz race rims are 2.3F & 2.5R bar or 33.91F / 36.75R PSI cold

[sapperj]

Cheers all,

I will have a play with those numbers.

Jas

[geoffm]

A rule of thumb is to look for a 2-3psi rise from cold to hot. Measure the tyre pressure cold, take it out for a good run and immediately measure the pressure again.

[Mishy]

What bike are you riding ?

[quickbuck]

What bike are you riding ?
My pick is on a Hyosung 250.

As for pressures, I would look at 33 front and 36 rear. May even drop 3 psi off each of those on the little 250.

[Metastable]

Talk to your tire supplier. The pressures mentioned are usually pretty good.... but the can change a lot. DON'T over inflate them, as a really hard motorcycle tire is a bad idea.

FYI - some tires (track stuff) will run low 20s and often more psi on the front than the rear..... but for the street, you should be fine in the mid 30s.

[quickbuck]

FYI - some tires (track stuff) will run low 20s and often more psi on the front than the rear..... but for the street, you should be fine in the mid 30s.

Correct... Depends on the Brand as to what suits when it comes to the race bikes too... And the suspension.
What usually happens is we send it out on what we used last time, find the rider is riding different, see the temp of the day is different, and see the surface is different, then get Robert Taylor and Dennis over, all go ooohhh ahhhh, change a few settings on the shock, and then adjust the WARM tyre pressure.... Or at least ensure it is correct (kidding, we actually did that first, but sounds more entertaining this way...), like 25 PSI for the rear Dunlop on the 450, and 30 PSI for the rear Metzeler on the 600.....


All that said, I bet you a million dollars you aren't working the tyre anywhere near as hard on the road... And you will expect it to last more than 100km....

[sapperj]

My pick is on a Hyosung 250.

As for pressures, I would look at 33 front and 36 rear. May even drop 3 psi off each of those on the little 250.

Correct... And thanks again for the info.
Look forward to hitting the hill this weekend.

[quickbuck]

Correct... And thanks again for the info.
Look forward to hitting the hill this weekend.

No worries.
Off "Round The Block (http://www.kapiticyclechallenge.co.nz/default.asp?PageID=16763)" are you?

Will be down there Saturday, will wave if I see you....

[CookMySock]

The hyo has quite stiff suspension and the shinko tyres are really hard compound and take a while to warm up.

If you want to corner it really hard, then lower the pressures perhaps to 26-30 ish, but I'd be pretty careful with that combination over any undulating surfaces or square-edged bumps, coz it will skip a tyre free quite easily.

If you just want to tour or commute in the dry, then keep your pressures up and the bike will feel nice and light, but turning to slippery and unpredictable in the rain. Shinkos in the rain are fucking awful at the best of times.

Steve