i*********5
发帖数: 19210 | 1 http://triathlon.competitor.com/2013/11/gear-tech/5-causes-of-a
Q: I keep getting flat tire after flat tire and I can’t really figure out
why. Is it just bad luck or is there something wrong with my tire?
A: It’s possible that you keep getting punctures from new sharp things
poking through the tire, but that’s unlikely. There’s probably something
wrong with your tire, wheel or the way you are putting a new tube into the
tire. These are the things that could be causing your recurring flats and
how to fix them.
Option 1: Something sharp is stuck in the tire.
The problem: If you don’t remove the object that poked the hole in your
first tube, it will probably poke through the replacement tube as well.
The fix: After getting a flat, inspect the outside of the tire for the
offending object. Pull out any shards of glass or other sharp things that
are stuck in the tire. Next, run your hand along the inside of the tire to
check for small items that are poking through. The tire is ready for a new
tube once you have removed all the sharp things from it.
Option 2: Your tire is worn out.
The problem: If the tire rubber is extremely overused, the threads—fibers
that make the backbone of the tire—can be exposed. When that happens, the
tire is much more susceptible to tearing and puncture. If the casing does
tear, flat protection is reduced and the tube can stretch beyond its usual
dimensions. Both of these cases can lead to flats.
The fix: A tire is dead once the threads are exposed. Switch it. You will be
better off changing the tire well before it gets to that point. Swap your
tires when the rubber at the crest starts to crown and looses its round
shape. Your rear tire will always wear faster than the front, but swapping
them both at the same time is the best practice.
Option 3: The tube is getting pinched while it is being changed.
The problem: If the tire gets poked with the lever or caught between the
tire and the brake track, it can puncture before it is even inflated.
The fix: Inflate the new tube a tiny bit so it holds its round shape before
you put it on the wheel. Pass the valve through the valve hole and then
press the tube in between the brake track walls so it sits in the wheel. Do
not allow any part of the tube to rest outside the brake track while
reinstalling the tire. Once the tube is seated in the wheel, use your hands,
not a lever, to snap the tire back on the wheel. If you use a lever to lift
the tire onto the wheel, the lever itself can swing around and poke a hole
in the tube by pinching it against the metal sidewall. Reseating the tire
with your hands eliminates that possibility.
Option 4: Riding with low tire pressure or hitting objecting in the road.
The problem: Pinch flats. If you tire is under-inflated and you slam into a
pothole or other object in the road, the tire will bottom out against the
rim and puncture from the impact between the wheel and the road.
The fix: Inflate your tires regularly. Wide wheels and broad tires can run a
lower pressure–down to 80PSI or so depending on rider weight–but standard
narrow wheels with 23c tires (check the label) need to be inflated higher,
typically 100PSI or more. And keep an eye on the road. Avoiding potholes
and other obstacles is the best way to prevent pinch flats. If an object is
unavoidable, lift the front wheel off the road slightly to hop over the
object or stand on the pedals and lift your weight off the saddle to use
your joints as suspension to absorb the blow.
Option 5: Rim tape isn’t covering the spoke holes.
The problem: The spoke holes’ sharp metal corners jab against the tube and
can cause a puncture if they aren’t completely covered with rim tape. Old
rim tape can depress into the spoke holes even if they are completely
covered, again creating a sharp edge that can puncture the tube.
The fix: New rim tape goes for about $3 a wheel. Get two new rolls that are
wide enough to stretch across the entire tire bed. Lay it flat in the wheel
and make sure it covers the spoke holes entirely.
No more flats! | h*****a
发帖数: 1992 | 2 简单用中文说说：
1. 外胎磨薄了要换，越薄越容易flat (废话…)
2. 上内胎要小心，不要把内胎夹在外胎和rim之间(先打点气，然后捏一圈，再打满气)
3. 如果漏气了，换内胎前先用手把外胎内壁和外壁都摸一便，看还有没有异物存在
4. rimtap看看还完好不。另外有一种rim tape的replacement叫veloplug
out
【在 i*********5 的大作中提到】
: http://triathlon.competitor.com/2013/11/gear-tech/5-causes-of-a
: Q: I keep getting flat tire after flat tire and I can’t really figure out
: why. Is it just bad luck or is there something wrong with my tire?
: A: It’s possible that you keep getting punctures from new sharp things
: poking through the tire, but that’s unlikely. There’s probably something
: wrong with your tire, wheel or the way you are putting a new tube into the
: tire. These are the things that could be causing your recurring flats and
: how to fix them.
: Option 1: Something sharp is stuck in the tire.
: The problem: If you don’t remove the object that poked the hole in your
| i*********5
发帖数: 19210 | 3 谢谢何老大！
气)
【在 h*****a 的大作中提到】
: 简单用中文说说：
: 1. 外胎磨薄了要换，越薄越容易flat (废话…)
: 2. 上内胎要小心，不要把内胎夹在外胎和rim之间(先打点气，然后捏一圈，再打满气)
: 3. 如果漏气了，换内胎前先用手把外胎内壁和外壁都摸一便，看还有没有异物存在
: 4. rimtap看看还完好不。另外有一种rim tape的replacement叫veloplug
:
: out
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