The 300SL name has been in the Mercedes stable for a long time, but the 50s-era Gull Wing models may be the best known, and for good reason. Along with the distinctive gull-wing doors, the 300SL had the world’s fastest top speed for its day and was the first car to offer fuel injection for consumer models.
The 300SL was an offshoot of the 1952 W194 race car, with “300” referring to its 3.0-liter engine and SL standing for “Sport Light.” The 300SL featured a tubular steel chassis for balance of strength and light weight. It was this frame that made the gull-wing doors necessary, with part of the chassis passing through the area where the lower half of a standard door would be. Without the gull-wing design, the 300SL would have been awkward to get in and out of; a tilt-away steering column wa ...[more]Read More
Rubber is a porous substance, and tires will inevitably lose some air over time due to seepage. Tire pressure is something that’s neglected by many drivers, as an “out of sight – out of mind” sort of condition. Low tire pressure, however, costs money in terms of increased rolling resistance and poorer gas mileage. Tires that are habitually run low on air also wear out prematurely, due to heat buildup and an uneven wear pattern.
The good news is that it’s an easy problem to fix.
For 100 years, tires have used the same valve design (known as a Schrade valve), identical to the valves on bicycle tires. They’re still the same design because the Schrade valve does its job well and there has never been a need to improve on it.
- Don’t rely on the ...[more]
You’ll notice that the stamp on your tire’s sidewall specifies inflation for HOT tires. Why is that?
Pretty simple physics, really. Gases expand with heat, meaning both the temperature of a friction-heated tire and ambient temperature of outside air. A rule of thumb is that for about for about every ten degrees Fahrenheit change in air temperature, your tire’s inflation will fluctuate by about one PSI. In most parts of the United States, the difference between winter and summer temperatures can be as much as a 50-degree spread, meaning a potential fluctuation of five PSI. That’s not even thinking about the 20-degree spread between hot afternoon temperatures and cooler nighttime or early morning temperatures in summer.
Tires that are low by 5 psi will hurt traction, steering re ...[more]Read More
If you live in an area that gets cold enough and sees enough winter precipitation to warrant buying winter tires, there’s no substitute for the traction they can provide. Winter tires have come a long way since the heavy-tread, noisy “snow tires” or “mud grips” that were on your dad’s station wagon a generation ago. Modern winter tires offer better ride, road manners and handling than they did in previous years. That doesn’t, however, mean that they are good year-round.
Winter tires are designed with a tread formulation that stays flexible at lower temperatures, which is their chief advantage over all-season tires. All-season tires tend to harden and stiffen at sub-freezing temps, compromising traction and control. The flip side ...[more]Read More
If you’ve ever felt your car “get away from you” on wet pavement, even for an instant, chances are you experienced hydroplaning. It’s scary at best, and can be downright lethal at worst.
Hydroplaning is what happens when your tires are overwhelmed by more water than they can scatter or channel away. The water pressure at the leading edge of the tire’s contact patch pushes water under the tire, and eventually enough water builds up that the tire loses contact with the road surface. The thin film of water between the rubber and road means a loss of braking, traction and steering control.
The first ten minutes of a light rain are actually the worst in terms of hydroplaning. In that ten minutes, the oil and rubber residue on the surface doesn’t have time to wash away, and inst ...[more]Read More
You’ve got a big set of mud tires on your truck or SUV, you should be able to go anywhere and do anything with those chunky, meaty treads, shouldn’t you? Not necessarily.
Mud tires can present several different problems when driving on snow or ice. The deep voids and chunky lugs of mud tires are designed to self-clean, meaning they eject soft mud, dirt and bits of gravel from their voids, just by centrifugal force. As tires self-clean, they have a fresh surface to bite into mud with every revolution. Think for a minute, though, about the consistency of snow that’s easy to pack into a snowball – that deep, powdery snow can easily pack its way into the voids and lugs of your mud tires and stay there, drastically cutting down on traction. When that happ ...[more]Read More
- Winter tires are designed with a rubber formulation that stays flexible in sub-freezing temperatures. That flexibility is important to traction in snow and slush, as a summer tire would stiffen and harden below freezing and compromise traction.
- Winter tires have a more aggressive tread pattern, with deeper voids to help evacuate slush and snow from the tread. They also often feature circumferential grooves to move slush and water away from the tire’s contact patch to avoid hydroplaning.
- Most tires now feature sipes, a network of tiny cuts in the tread that provide additional biting edges for tract ...[more]
We all have a toolbox in the garage or inside the house, but what about in the trunk of the car? What if you're on the road and you get a flat tire? Do you have everything you need to take care of it from the road?
It's even more important to keep some tools in the car when you're traveling a long distance because you never know what could happen along the way. Check out our list of essential tire tools to have with you at all times and you'll have a little more piece of mind every time you travel. All of these tools can be stored in the trunk or spare tire area of your vehicle.
If you need to remove nails and other foreign objects from a tire, pliers are your best friend. They also come in handy for grabbing small objects in a pinch. ...[more]Read More
A big reason why SUVs have become so popular is their versatility, especially in cold climates – even if your SUV never leaves the pavement, it’s pretty handy to have that traction when things get snowy. There are plenty of all-season tire options out there for SUVs, but we took the time to pull together some of our favorites for you:
· Michelin LTX M/S2 – Michelin’s LTX M/S2 is designed with Michelin’s long-wearing, all-season silica-enhanced tread compound, with Michelin’s MaxTouch construction. The rubber compound is molded into a symmetric tread design with stable independent tread blocks and high-density 3-D Active Sipes for all-season traction. Four wide channels, multiple lateral grooves and open slots at the shoulders help move water away from the tire’s contact patch. Internally, the LTX M/S2 features ...[more]Read More
Tread depth is crucial to your safety! Once the tires on your car get below a certain minimum tread depth, your steering, handling and traction are compromised seriously enough that your car is considered unsafe to drive. Most states cite 2/32” as a minimum tread depth, but the truth is that your traction in wet weather or snow can be treacherous long before the tread makes it to 2/32”.
Most tire brands have “wear bars” embedded in the tread grooves, at a right angle to the tread. Once the wear bars start to show through, it’s definitely time to replace the tires.
The oldest rule-of-thumb test is the “Lincoln head penny” test – insert a penny into the tread, with Lincoln’s head pointed down. If the tread doesn’t come to the top ...[more]Read More