Do you run higher pressure in the rear or the front tyre?
Why?
Higher in the rear
Higher in the front
Same both ends
Depends
Don't know
on the wagon
Do you run higher pressure in the rear or the front tyre?
Why?
Meeeeeeeeeh
Because my rear tyre is bigger than the front one
Mememe
The pressures that you should run are higher in the rear as you generaly sit closer to the rear axle, ie. cruisers have a lot of weight while sport bikes will have a little more weight on the front (crouching position.)
I would think that due to the amount of weight on the rear wheel when under acceleration more is needed in the rear.
Can anyone clarify?
You name it, I can bin it!
cos the owners manual says to...
and it seems to handle well that way, so who am I to question it?
Originally Posted by thealmightytaco
sem fiddy pilot
That's what I reckon, as well
Member, sem fiddy appreciation society
on the wagon
Thats what i thought as well, until i was told by a rider who knows his shit i was wrong.
Hopefully he or someone as clued up will come along and post the science behind it all
Fully qualified Sifter.
That's probably on the button! Because of the size, the rear tyre probably distorts under load more than the smaller front, so needs a slightly higher pressure to stay in shape as compared to the front.Because my rear tyre is bigger than the front one
Hardcore Biker
Manual says same for both so I stick to it.
Fully qualified Sifter.
Obviously the maker knows best, but as far as road bikes go, I think they go on the high side with pressures. Maybe for resistance to flats or distortion for continued high speed runs. Most (road) race bikes will be running around 29-32 psi.
Forum whore
Perhaps, but surely the larger air quantity would mean that for the same pressure it is able to support a greater weight.
For example a typical car tyre which is supporting a lot more weight per wheel than a bicycle uses way less pressure than a bicycle tyre due to the greater air volume.
Weight distribution is often quoted by the manufacturer. In the case of the Fazer they quote 51% front 49% rear. I assume (though I realise assumption is the mother of all fuck ups) that is with a rider on board, if not, why quote it as it would be useless information as a bike can't be ridden without a rider. Therefore you have roughly equal weight distribution. The forces under decelleration are greater than accelleration, so were a variance in presure required for accelleration, surely they would be required for decelleration and require greater pressure in the front.
One reason however for the manufacurer suggesting more in the rear could be to ensure it handles max load acceptably.
Forum whore
Perhaps the greater air volume would mean greater increase in pressure when it is heated?Thats what i thought as well, until i was told by a rider who knows his shit i was wrong.
Hopefully he or someone as clued up will come along and post the science behind it all
Have you noticed the big tyres on rail cars or funny cars they run those things real flat. Bet they aren't at the end of the strip.
Don't read this.....
Depends what you are doing really.On road it'd be higher in the rear whereas on track lower on the rear cause its working harder and getting hotter.
Forum whore
While this subject is very dependant on riding style,bike type,set-up and use.
From your point of view as a very rapid road rider and also being fucking handy on a bike around a track...your after out right grip...and probally not as concerned about getting every last KM of life from your tyres.
They truely acurate way to get your tyre pressures right for you and your bike is using a pyrometer..these devices if your not familar with them measure temprature..and will measure the temp of your tyre hot..and with this info you can see if in the conditions you have been riding in, you have reached or are near the tyre manifactuers temp range for the tyre/compound etc..
and using that info you can adjust your tyre presures accordingly.. but it also comes down to feel and out right grip...running softer pressures will increase the contact patch of a radial tyre..but the trade off is loss of feel..and in the front can slow turn in..another side of the tyre presurre debate is carcuss temprature...the lower the pressure the more the carcuss can flex..but you don't want the pressures so low that the carcuss is able to deform..as this will cause a bike to be unstable and unpredictable in corners..but alowing this flex creates a bigger contact patch..and any fool can understand the benifits of that!!!
on a track day you could easily expect a front tyre to increase 2-4 psi from cold and 6-8 psi from cold on the rear depending on your starting pressure/temp but it is a marked increase regaurdless and can relate a heap to your feel and grip..and tyre life... manifacture's recommended pressures come from a balance of getting extended life from tyres..and are aimed almost directly at the typical I can't be bothered thining about this sort of shit sportsbike rider..which is obvious if your talking to riders and the tyre brand.type convosation comes up...no one ever talks pressures!!
another part of this debate is tyre side grip at high lean angles...at high lean angles your suspension is trying to put a vertical force through a semi horizontal plain..with huge resistance from the swingarm link ratio's and spring,damping curve..so the tyres do alot of work on tiny bumps while cranked right over..and you cant just run your suspension super soft to counter this.
between tyres,suspension,geometry,riding style,etc there is a good comprimse for everyone in there somewhere!...main thing is...different things will work better or worse for different people!! eg: slow person on a gsx1400 will benifit from a complely different set up from a fairly rapid dude on a R1 etc
your on supacorsa pros?? [I think u said] 32 rear , 34 front would be what I reckon you should start at and go from there.
on the wagon
Thank you Mr Poos
(yes, on super corsas and yes, they seem to work alot better with the rear lower)
Last edited by kiwifruit; 27th April 2008 at 15:30. Reason: rear lower, not front, TIMMAY!!!!
Forum whore
So, just to be sure, are you saying that increased pressures will generally extend tyre life?
There are currently 1 users browsing this thread. (0 members and 1 guests)
Posting Permissions
Reply With Quote
Bookmarks