105 votes

Does kicking a tire off your car from underneath it while it's held up by a stable jack pose safety threats?

The ONLY time you should crawl under a car is when it is supported by a jack stand or on a lift. A jack is used to jack the car up and let it down. It is a huge safety concern to use it to support the ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
77 votes
Accepted

Why don't we rotate tyres but you rotate tires?

tl dr: Kwik Fit is full of crap. It's good to rotate tyres (and tires, too :o). The entire idea of rotating tires is to keep the wear relatively similar (or even), front to rear. If rotation is done ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
60 votes

Why don't people hand pump their tires?

There is no theoretical reason why you couldn't use a bicycle pump to fill car tyres. Indeed I used a double barrel foot pump to pump the tyres on my wifes' bicycle last night that I usually use for ...
Steve Matthews's user avatar
56 votes
Accepted

Is it safe to drive my car to a repair shop with a bolt in the tire? (picture)

Honestly, it would be best to put on a spare. Chances are you could make it to the shop with no problem, but there's an increased risk. The tire could rip and rapidly deflate, or it could leak fast ...
JPhi1618's user avatar
  • 13.2k
56 votes
Accepted

Why use snow tires on all 4 wheels on 2-wheel-drive cars?

What you are failing to realize is the non-drive axle provides stability. Yes, the two tires with power going to the ground needs traction to motivate the vehicle down the road, however, you still ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
50 votes

Why don't we rotate tyres but you rotate tires?

Just thought it was an interesting topic, so googled around a bit for actual sources. First of all, some (or maybe all) BMW's actively recommend NOT rotating tyres. Cartalk covered this in one of ...
David Mulder's user avatar
47 votes
Accepted

Normal to leave nail in tire after a flat?

Nope, not normal You do not leave a foreign object in a tire under any circumstances. The object can dislodge itself during higher speeds and lead to deflation creating a very high risk event. If ...
DucatiKiller's user avatar
  • 32.9k
45 votes
Accepted

Why don't people hand pump their tires?

People do that. Sometimes, at least. I have a high quality (high volume) bike pump at home, and occasionally I use it to check the pressure on the car, or to top off if it's obviously missing ...
AnoE's user avatar
  • 800
41 votes
Accepted

Why are wheels labeled "R16" when the 16" is actually the diameter?

Tires (or tyres) are marked as www/hhRdd where www is the tread width in mm, hh is the sidewall height as a percentage of width and dd is the inner diameter in inches. I.e. 245/75R16 has a width of 24....
psaxton's user avatar
  • 492
39 votes

What is my friend's wife not telling him (about this tire)?

This tire was driven on long after the blowout When there is sidewall separation from tread carcass like this it had to have been driven on longer than claimed. When a tire suffers pressure loss and ...
DucatiKiller's user avatar
  • 32.9k
38 votes
Accepted

What are these metal clips where my wheel rims meet the tires and what are they for?

They are exactly what you stated: wheel weights. They are used to balance the tire so when you are going down the road you don't get an out of balance condition. These are VERY important for several ...
Pᴀᴜʟsᴛᴇʀ2's user avatar
38 votes

Does kicking a tire off your car from underneath it while it's held up by a stable jack pose safety threats?

Yes, you do have something to worry about. Even with a lot of weight on a jack, the jack could move, either back and forth, or side to side, and the whole shebang could pivot down until the car rests ...
DavidRecallsMonica's user avatar
38 votes
Accepted

I got this screw in my tire, should I plug or replace?

That one looks too close to the sidewall. Bring $$ and replace. Reference Here Apparently that tire repair guidance originates from the guidelines set by the USTMA (U.S. Tire Manufacturer Assoc.) ...
zipzit's user avatar
  • 6,539
36 votes
Accepted

Why only one spare wheel

Many modern cars have no spare wheel at all. BMW have recently started implementing run-flat tyres across the range. Tyres which can, even with a puncture and no air pressure, be used at a reduced ...
Steve Matthews's user avatar
33 votes

What is the small metal square attached to the wheel or tire?

Those appear to be wheel weights. When mounted on the rims, tires are often not totally and absolutely balanced. When you drive, it may cause all sorts of shaking issues if it is badly out of balance....
Blackbeagle's user avatar
30 votes

Are tyre repair kits a viable alternative for a spare wheel?

Yes, but personally, I wouldn't risk it. The only time I've ever needed my spare was [cue spooky music] on a dark, stormy night, on a two lane highway through a dense forest. I was doing ~50 mph when ...
MooseLucifer's user avatar
  • 6,007
28 votes
Accepted

"Fill nitrogen in tires" poster - are the claims credible or just hot air?

Summary The difference for passenger cars is pretty small, but it seems to be quite real. The less you maintain your tires the bigger the effect is. In large fleets of vehicles, the effect can be ...
MichaelS's user avatar
  • 607
27 votes

What is the small metal square attached to the wheel or tire?

This is a wheel balancing weight. This type is held onto the inner side of the wheel with double-backed foam type adhesive tape. The the "1/4" stands for one quarter of an ounce. The "FE" denotes ...
Fred Wilson's user avatar
  • 11.6k
26 votes

Why do tyres go flat after a few weeks of non-usage?

Your wheel is obviously leaking somewhere. There are a few places that you can have a leak related to the wheel The Schrader Valve - The schrader valve within the valve stem where you refill the air ...
DucatiKiller's user avatar
  • 32.9k
26 votes
Accepted

What is this wire in my tyre?

These wires are probably the wires in the steel belt of your radial tire. If you see those wires, the tire is worn out. You should replace it today! No, you should have replaced it yesterday! For ...
juhist's user avatar
  • 14.5k
25 votes

"Fill nitrogen in tires" poster - are the claims credible or just hot air?

Nitrogen molecules are bigger than normal air - Air isn't a molecule, it's a compound consisting of 78% Nitrogen, 20% Oxygen, 2% other. So that's a ridiculous comparison. Less leakage - See above. ...
justinm410's user avatar
  • 1,722
25 votes

Cheap winter tires vs high quality all seasons

I have on my Toyota RAV4 summer tires that are described as "all-season tires". They are not safe to use in winter. Recently, I drove using these summer tires in light snow extremely carefully, and ...
juhist's user avatar
  • 14.5k
25 votes

"Iron wires" showing through sidewall

The "wires" you mention are likely the tire cords - essentially bands of steel wire that are major structural elements of the tire's construction. If they are exposed this is an indicator of imminent ...
motosubatsu's user avatar
24 votes
Accepted

Are trims (Hubcaps) on a car tires necessary?

No, hubcaps are purely cosmetic and do not need to be fitted. Some designs improve fuel economy and reduce wind noise by having a fairly flat surface but a car with one or more missing hubcaps is ...
Steve Matthews's user avatar
24 votes

Does kicking a tire off your car from underneath it while it's held up by a stable jack pose safety threats?

What you did was dangerous, there are Darwin Awards for just this type of thing! The likelihood of something going wrong is low, but the consequences are terrible if it does. There are many failure ...
GdD's user avatar
  • 16.9k
22 votes
Accepted

Tire sidewall damage, replace immediately?

Sidewall damage is a serious issue. Sidewall is the structural part of the tire, and damage to it can result in dangerous consequences. Replace your tire immediately. If you know how to put the spare ...
juhist's user avatar
  • 14.5k
21 votes
Accepted

Are tyre repair kits a viable alternative for a spare wheel?

Do you carry a toolset, lights, spare belts and hoses, and OBD-II decoder and electrical patch cables? If not, then you're not taking on much more risk by leaving the spare at home, provided you ...
Brian B's user avatar
  • 326
21 votes
Accepted

Hit a curb; chewed up rim and took a chunk out of tire. Will they need replacement?

tl;dr: Sadly, that tire appears to be a goner. The wheel is likely fine, though. You might be able to replace just the one tire. If you look at the divot cut out of the side of the tire, you'll see ...
Bob Cross's user avatar
  • 24.4k
20 votes
Accepted

Winter tires and summer tires

As Pᴀᴜʟsᴛᴇʀ2 said, saving the rims turns out to be a better solution. Usually, we keep two sets of rims: one with our winter tires, one with our summer tires. A very rough average lifespan (with my ...
anonymous2's user avatar
  • 5,225

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