Do u pump till 300kpa?

[Blackyv]

well, infact, im not really sure is it advisable but i know mine recommended is 230F/210R and i always pump to 240F/220R on my 16".... what really shock me is the other day, saw one guy pump 300 for all 4 tyres for his 15"... .. i was behind him and saw him pump it till it hits 300kpa... if im not wrong, tyre has a limit and anyone here pump till that level??...

 

actually, that is not all ... after me, one guy with a bicycle waiting after me for air pump also... when i board my car, saw him adjust till 300kpa also and pump his bicycle happily and the tyre seems can take it...... not too surprise about the car but a bicycle tyre also can take 300kpa?..

[Meloble]

Haha, bro, FYI, Bicycles can pump much higher than cars... Road bikes can pump up to 600++KPA ! Don't be surprised, 300KPA is probably a norm for mountain bikes...

[Friendstar]

ya i agree

i use to pump 270 for my mountain bike also

[Dwoon]

I've never followed the recommended pressures stuck on the car door area. Yes, I've pumped to 300Kpa on my stock 16" previously (although recommended was 230F/200R (I think). I usually gauge that the tyres have about 1 baby's foot contact with the ground.

 

For my 17" now, I don't have to go to 300Kpa. About 260 will achieve that. Moreover, there's a warning on the tyre not to exceed 275KPa anyway.

 

Dunno whether advisable or not.... but I've been doing this.

[Watwheels]

Actually for tyres they can max take up to 4~5 times more than their working pressure.

 

300kPa = almost 3 times the atm pressure ( 1 atm pressure = 101.325 kPa, at sea level)

 

 

I pump 300kPa for my company's van also. It's like 3 times the normal atm pressure around us.

 

Google and read up in wiki if u wanna know more. The numbers look very big but in fact in atmospheric pressure is not a lot.

[Nhrisuzu]

i pump 245F/235R on 15".. recommended is 220F/200R..

Edited April 17, 2007 by Nhrisuzu

[Robin]

i only do about 230kpa on my 15" .. i think if u over-infate also not good

[Kozen]

Just to check, what gas/air do we usually use for tyre? I heard from my colleague that pumping nitrogen gas to tyres are the best, is it true?

[Nine_eleven]

correct tire pressure is related to load index of the tire, not the size....

[Boyboy]

not too surprise about the car but a bicycle tyre also can take 300kpa?..

 

mountain bike knobby tire can take up to 60 PSI

 

MTB slick (road) tire can take up to 80 PSI.

 

Road bike thin slick tyre, 100 over PSI.

 

now, i believe 30+ psi= to 200+ kPa.. not too surprising now eh?

 

i've seen van driver pump over 300 kPa also. in fact, my prev ride, a kangoo, had recommended inflation pressure at just under 300kPa for rear tyres.. abt 280/290? if running on full load.

 

however, for normal car, i believe it's too high. unless toyota alphard or ssyanong stavic

[Cactus]

I think its beter to follow the recommended settings.. at least for my case.

Whenver I pump 230 and above.. the ride gets very bumpy and choppy, and any road imperfection can be felt, very uncomfy.

 

So usually pump 210F. For rear.. i dont even bother to pump frequently, so long as I see they are still "full".

[Boyboy]

what's ur reason for overinflating by that much? i'm sure it compromises grip and comfort.

 

FC and steering response (due to reduced sidewall flex) may improve.. but still i keep to within 20kpa of recommended pressure..

 

btw, what pressure do u use for track (as compare to daily use)? i'm new to it so learning where i can . some say use a bit lower pressure cos tyres heat up.

[Route88]

Shouln't be a problem when the tyre is hot (expanding)....the pressure will reduce if the tyre is cold.

[Blackyv]

never knnow bike's tyre can take such load....

[Dwoon]

It does to a certain extent compromise on the comfort, if I really over pump. But with one baby's foot contact (flattened length about 8cm), it is still quite alright, unless I hit humps or bumps.

 

Reasons.... hmmm... it gets me better FC. I'm lazy to inflate tyres often. I also hope to wear the tyres out at the centre (as my tyres seem to wear more at the edges). Maybe I'm totally wrong for the last part and someone can enlighten me how to get more even wear.

 

I usually have quite a full load (but when I pump tyres, I'm usually alone). So although I pump so full, when I load up with stuff and passengers and then observe the tyre's contact area, you'll notice that the contact is now more.

 

As mentioned, I do not claim this to be a correct practise .... just that I've been doing it, that's all.

[Victorco]

260 when heated when driving will be over 275 plus your drive load. sure more then that. maybe u wan to lower the amt u pump in.

[Dwoon]

Errr.... but my tyres are already heated up when I pump leh.... Normally do it on my way home from work. I don't pump them when cold.

 

So actually, will the pressure increase since the tyres contract slightly upon cooling???

[Russ]

I overinflate as well but only 20kpa over the recommendation.

300 kpa is a bit on the high side IMO