tyre pressure, The noobest Question ever
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 Jun 21 2011, 02:59 PM
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Junior Member
122 posts Joined: Mar 2009  
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Haha...got one time after i finished pumping air to my bike, then got one car waiting behind (cute girl)
 so i gave the pump to her...i already increased the pressure to 32 psi...she looked at me (gave a weird reaction)... she increased the pressure to 40 psi  for here myvi  i just left after that, she made me look like orang bodoh that time, i hoped that she doesnt involve in accident... |
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Jun 21 2011, 05:11 PM
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VIP
3,055 posts Joined: Jan 2003
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QUOTE(onyxzoom @ Mar 24 2011, 09:15 PM) Average just pump 31-33psi. I'm not sure if that is exactly accurate.If u wan more comfort, then pump abit less. Will be better for braking too because more tyre surface contact with the road. If u wan better fuel consumption, then pump abit more. Less tyre surface contact with road means less friction. But don't overpump, or it will compromise braking. Normally if I'm pumping on a hot day or if I've driven to the petrol kiosk, then I'll pump a little bit more to compensate for expansion. So maybe abt 34-35psi.  http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=1 QUOTE Disadvantages of Underinflation An underinflated tire can't maintain its shape and becomes flatter than intended while in contact with the road. If a vehicle’s tires are underinflated by only 6 psi it could lead to tire failure. Additionally, the tire’s tread life could be reduced by as much as 25%. Lower inflation pressure will allow the tire to deflect (bend) more as it rolls. This will build up internal heat, increase rolling resistance and cause a reduction in fuel economy of up to 5%. You would experience a significant loss of steering precision and cornering stability. While 6 psi doesn’t seem excessively low, remember, it usually represents about 20% of the tire’s recommended pressure. Disadvantages of Overinflation An overinflated tire is stiff and unyielding and the size of its footprint in contact with the road is reduced. If a vehicle's tires are overinflated by 6 psi, they could be damaged more easily when running over potholes or debris in the road. Higher inflated tires cannot isolate road irregularities well, causing them to ride harsher. However, higher inflation pressures usually provide an improvement in steering response and cornering stability up to a point. This is why participants who use street tires in autocrosses, track events and road races run higher than normal inflation pressures. The pressure must be checked with a quality air gauge as the inflation pressure cannot be accurately estimated through visual inspection. http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=2 QUOTE The next test was run on our test course to confirm the influence of tire pressure on the tire's performance at its limit. While the drivers thought that the properly inflated tires provided responsiveness and predictable handling, they quickly realized that the same tires in an underinflated state left a lot to be desired. The underinflated tires required more steering input to initiate maneuvers and were slower to respond. The underinflated tires also felt out of sync during transitions; instead of moving in unison, the rear tires' reactions lagged behind the front tires, resulting in a detached sensation being transmitted to the drivers http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=3 QUOTE While driving at the edge of a tire's ability in wet conditions is challenging, the car with the properly inflated tires provide handling that was predictable. Driving the car with the underinflated rear tires proved to be much more difficult to drive and forced the driver to slow down to retain control, producing lap times that were several seconds slower than the properly inflated car. While tire manufacturers can develop tires with great hydroplaning resistance and wet traction, poor maintenance of tire inflation pressures can make a great tire awful. --------------------------------------------------------------------------------------- QUOTE(rcracer @ Mar 24 2011, 10:37 PM) er i mean you can inflate a lorry tyre to 32 psi and a bicycle tyre to 32 psi both have same pressure but amount of air is different It doesn't really matter. As long as you got the correct pressure, the correct amount of air will be in the tire. The question is, what should be the correct pressure?This post has been edited by +Newbie+: Jun 21 2011, 05:12 PM |
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Jun 23 2011, 11:03 AM
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Junior Member
64 posts Joined: Jan 2007 From: Kuala Lumpur
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What is your suggestion for 215 45 17 tyres ?
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Jun 23 2011, 11:44 AM
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Senior Member
9,048 posts Joined: Jan 2003
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I normally pumped 250 for all 4 tires on my truck. Saw 1 aunty pumped 310 for her Honda Jazz. Wanted to tell her but she drove away.
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Jun 23 2011, 02:21 PM
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Senior Member
4,999 posts Joined: Jan 2003
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I pump 235, because it will last longer between air pumping intervals.
Added on June 23, 2011, 2:21 pm I pump 235, because it will last longer between air pumping intervals. This post has been edited by Drian: Jun 23 2011, 02:21 PM |
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Jun 23 2011, 03:03 PM
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Junior Member
175 posts Joined: Jun 2011
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QUOTE(Joseph Hahn @ Mar 24 2011, 10:57 AM) Haha i prefer kPa and digital pump. Ya, for me also... last time i like to use manual but now i more like to use digital pump.  Easy and understanding.  |
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