Tyre Pressure

PandA wrote:

Hi all

I'm sure this has been asked before, but I couldn't find any questions in
the previous posts about it.

I have a pretty crappy touring bike (Repco Traveller), on the tyres it says
that the max PSI is 85.

I usually use a hand pump which gets me no where near this, but since I am
essentially lazy, have taken it to the local servo to use their compressor.

Should I be filling the tyre to the max 85 PSI (will this cause harm to the
tyre, e.g. more likely to puncture?), or to something lower (about 40 is
what I can get with the hand pump)

I have tried consulting web sites on bicycle maintenance but they seem to
talk of putting 120PSI in. My tyres must be pretty crappy to match the bike
to have a low max....

Anyhow, your suggestions are appreciated.

Andrew.

At 40psi your are more likely to get punctures, especially ones caused
by running over objects and pinching the tube against the rim. 75-85
would be much safer. It will prevent the tyre roling off the rim during
tight/fast cornering.

That said, if the tyres are stuffed, get new ones.

Peter
--
Peter McCallum
Mackay Qld AUSTRALIA

Hi all

I'm sure this has been asked before, but I couldn't find any questions in
the previous posts about it.

I have a pretty crappy touring bike (Repco Traveller), on the tyres it says
that the max PSI is 85.

I usually use a hand pump which gets me no where near this, but since I am
essentially lazy, have taken it to the local servo to use their compressor.

Should I be filling the tyre to the max 85 PSI (will this cause harm to the
tyre, e.g. more likely to puncture?), or to something lower (about 40 is
what I can get with the hand pump)

I have tried consulting web sites on bicycle maintenance but they seem to
talk of putting 120PSI in. My tyres must be pretty crappy to match the bike
to have a low max....

Anyhow, your suggestions are appreciated.

Andrew.

On Fri, 27 May 2005 at 01:17 GMT, PandA (aka Bruce)
was almost, but not quite, entirely unlike tea:
Should I be filling the tyre to the max 85 PSI (will this cause harm to the
tyre, e.g. more likely to puncture?), or to something lower (about 40 is
what I can get with the hand pump)

I have tried consulting web sites on bicycle maintenance but they seem to
talk of putting 120PSI in. My tyres must be pretty crappy to match the bike
to have a low max....

120 is for road bikes. The 85 limit is more like a touring bike
(1.5"). Some mountain bike tires are far lower.

I can barely get 40 with my hand pump - quite dissapointed after
seeing the performance of a couple of the tiny hand pumps on the BR
rides. Foot pump gets me up to the necessary 70 on my thicker touring
tires, and 90 or so on the thinner tire. My foot pump doesn't have a
guage though, so I have to rip the pump off, and then apply my hand
pump with guage, and quickly release it once I have read the guage,
before too much air has escaped.


I found when I first decided to pump one of my tires up to its limit,
I got a flat very quickly. Taking a look at the tire, I realised the
canvas was showing through - definitely a sign to replace the tire.
The only time you should get a flat (or blowout) when pumping up to
the limit, is when the tire is too old, and when the outside
temperature is so hot that the air inside the tube has increased
pressure significantly.

--
TimC -- http://astronomy.swin.edu.au/staff/tconnors/
Like most computer techie people, I'll happily spend 6 hours trying to figure
out how to do a 3 hour job in 10 minutes. --Rev. James Cort, ASR

TimC wrote:

I found when I first decided to pump one of my tires up to its limit,
I got a flat very quickly. Taking a look at the tire, I realised the
canvas was showing through - definitely a sign to replace the tire.
The only time you should get a flat (or blowout) when pumping up to
the limit, is when the tire is too old, and when the outside
temperature is so hot that the air inside the tube has increased
pressure significantly.

I've found that running very high pressures (110-120psi) increase my
chances of getting punctures from glass intrusion... Lower pressures
(~100psi) seems to allow the tyre to deform around the glass (or similar
sharp object), rather than holding it's shape and allowing the sharp
edge to cut through the case

YMMV

--
BrettS

For my MTB commute I go hard but stay 10% shy of max. Hard tyres save
punctures as the tyre surface is pretty stiff & can deflect some pesk
hole inducing debis.

For my dirt MTB the tyres are rated up to 80psi, but I find tha
45-50psi is best for handling & traction. higher psi offroad makes i
bounce all over the shop (hardtail),l not sure about pinch-flats as
have not expereinced any

--
Marx SS

How cool - my first ever 'road bike' was a Repco Traveller, saved up my
pocket money and part-time wages for ages to get it. Had those groovy
'brake lever extensions' across the handlebars so you could still brake
while riding 'upright'.

Aaah, the memories...

Absent Husband

"Marx SS" wrote in message
...

For my MTB commute I go hard but stay 10% shy of max.

Waaay to much information! And stop bragging anyway. :-)

Cheers
Peter

Peter Signorini wrote:

"Marx SS" wrote in message
...

For my MTB commute I go hard but stay 10% shy of max.

Waaay to much information! And stop bragging anyway. :-)

Cheers
Peter

****, we're verging on aus.brothel now!

"Tamyka Bell" wrote in message
...
Peter Signorini wrote:

"Marx SS" wrote in
message
...

For my MTB commute I go hard but stay 10% shy of max.

Waaay to much information! And stop bragging anyway. :-)

Cheers
Peter

****, we're verging on aus.brothel now!

It's one of those days, I suppose. Winter is upon us and with it, the urge
to snuggle. Snuggle is a word with a potentially broad spectrum of use too,
before anyone say anything.

"Absent Husband" wrote in
oups.com:

How cool - my first ever 'road bike' was a Repco Traveller, saved up
my pocket money and part-time wages for ages to get it. Had those
groovy 'brake lever extensions' across the handlebars so you could
still brake while riding 'upright'.

Aaah, the memories...

Absent Husband


Anyone know if you can still get brake levers with those groovy 'brake
lever extensions'? I'd really like a set for a little project I have
(restoring my first 10 speed).

Cheers

BrettM