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  1. Tire Chains
  2. pewag
  3. Tire Chains
  4. On Road Only
  5. Deep Snow
  6. Automatic
THIS ITEM IS NOT A FIT FOR
1993 Ford Van
pewag

pewag Servo RS Tire Chains - Diamond Pattern - Square Links - Self Tensioning - 1 Pair

Part Number: PWRS79
In Stock
$204.32
Retail:$229.95
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Tire Chains
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1993 Ford Van

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Just make connections and drive - these chains will automatically tension with the flip of a switch. Provides consistent traction in snow and light ice for your vehicle. Diamond pattern delivers a smooth ride and square links bite into ice. Great Prices for the best tire chains from pewag. pewag Servo RS Tire Chains - Diamond Pattern - Square Links - Self Tensioning - 1 Pair part number PWRS79 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (182)
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pewag Tire Chains - PWRS79

Highlights

  • Custom Fit for Your Vehicle: Chains made to match your tire size for a snug fit
  • Hands-Free Tightening: Flip the switch and drive—chains self-center and tension automatically.
  • Smooth, Steady Grip: Diamond pattern with 3.2 mm square links grabs snow and ice without a harsh ride.
  • Built for Tight Spaces: SAE Class S design fits vehicles with limited wheel-well clearance.
  • Corrosion-Resistant Strength: Titanium alloy steel stands up to winter salt and slush season after season.
  • Quick One-Stop Install: Make two connections, engage the ratchet, and you’re ready to roll under 30 mph.

Features to know about

Confident Traction in Snow and Ice: Diamond Pattern with Square Links Grips Firmly

When the roads turn slick with snow or light ice, these chains deliver steady traction that keeps you moving. The diamond pattern spreads the contact evenly for a smoother ride, while the 3.2 mm square links dig into the surface for a solid grip without the bounce you get from ladder-style patterns. It’s traction you can trust for tough winter climbs and slick commutes alike.

No Need to Stop and Retighten: Servo Self-Tensioning System Keeps a Perfect Fit

Once you make the connections and flip the servo switch to “drive,” these chains automatically tighten and center themselves as you roll. There’s no need to get out and readjust. The built-in servo ratchet keeps the chains snug and balanced, giving you a consistent fit and reliable performance every time.

Fits Tight Wheel Wells with Ease: SAE Class S Low-Clearance Design

If your vehicle doesn’t leave much space around the tires, these chains are made for it. They meet SAE Class S clearance requirements, so they fit where other chains can’t. The compact profile helps protect your wheels and still gives you the winter traction you need.

Built to Handle the Elements: Titanium Alloy Steel Resists Corrosion

Snow, slush, and road salt are tough on gear, but these chains are made from high-quality titanium alloy steel that stands up to corrosion. The strong links hold their shape and stay smooth season after season. Plastic wheel-rim bumpers add an extra layer of protection where it counts.

Ready When You Need Them: Compact and Lightweight for Easy Storage

You may never want to use them, but when snow hits, they’re quick to grab and go. The lightweight build and included durable storage case make it easy to keep them in your vehicle all winter. Having them ready means you’re covered whether you’re headed to town or through a mountain pass.

Specs

Fit

  • Fits: 15" - 20" tires (for exact sizes, see below)

Diagram showing SAE Class S tire chain clearance requirements with labeled measurements A and B indicating minimum distances between tire tread and wheel well and between tire sidewall and vehicle.

  • A: a minimum of 1.46" (37 mm) between the top of the tire tread and the wheel well
  • B: at least 0.59" (15 mm) between the tire's sidewall and the vehicle

Construction

  • Link thickness: 3.2 mm

Quantity

  • Quantity: 2 chains

Warranty

  • Warranty: 90-Day warranty

Note

  • Note: To determine whether you can use snow chains on your vehicle, and how they may affect your ABS/EPS functionality, consult your owner's manual.

Confirming Your Fit

If you know your tire size, you may think you won't need to test fit your new chains. But there are a lot of variables that can affect whether chains will fit your specific tires, including your tire type, the amount of air pressure in the tire, the amount of tread wear, and the tire manufacturer.

We recommend that you order chains as early in the season as possible to give yourself plenty of time to test fit the chains and reorder if needed. This way, you won't be stuck out in the cold later with snow chains that don't fit.

You can test fit these chains in your garage or driveway, but you'll want to wait until there's snow on the ground to actually drive with them. Likewise, if you're out in the snow and come across bare pavement, you'll want to pull over and remove the chains. These chains can cause damage to the bare pavement, your garage floor, or your vehicle if they break from the wear of riding on a harsh surface.

RS 79 pewag Servo RS Self-Tightening Chains - Passenger Car Vehicles - 15" - 20" Tires - Qty 2

Replaces pewag 02940




These chains fit the following tire sizes:

  • 205/75-17.5
  • 205/75-17.5S
  • 215/80-16
  • 215/80-16S
  • 225/65-17
  • 225/65-17S
  • 225/65-17X
  • 225/70-16
  • 225/70-16S
  • 225/75-16
  • 225/75-16S
  • 225/80-15
  • 225/80-15S
  • 235/55-18
  • 235/55-18S
  • 235/70-15
  • 235/70-15S
  • 235/75-15
  • 235/75-15S
  • 245/50-18
  • 245/50-18S
  • 245/55-17
  • 245/55-17S
  • 255/50-17
  • 255/50-17S

Customer Satisfaction Score:

Ratings & Reviews

4.5

182 reviews
Review sort icon
Just make connections and drive - these chains will automatically tension with the flip of a switch. Provides consistent traction in snow and light ice for your vehicle. Diamond pattern delivers a smooth ride and square links bite into ice.

by:

If you have the 2024 Honda CRV 2WD buy these bad boys (I have the sport-l 18" rim version). These reinforced my decision and confidence to buy 2WD vs AWD. I live in a mild climate area and used these on my last trip to Big Bear, CA. I had to sign a waiver at the dealership to only use cables, but because these are S rated they hug your tires just the same. I saw plenty of cheap broken cables on my way up the mountain and glad I spent the money on these instead. I was able to drive without issue in a snow storm on un-plowed roads. No real slippage was experienced. These were easy to drive with on, quiet in snow, and tolerable on dry road. I kept my speed to 30MPH or below. Some suggestions:

- Do practice putting the chains on each wheel and taking them off before your trip.

- Have gloves handy, preferably snow rated as they will get wet. I would even get a plastic mat for your knees.

- Take a screenshot recording of etrailor's video of putting the chains on in case you need a refresher and don't have service.

- You may struggle getting the plastic components to uniformly fit on the sidewall of the tire. Some of mine were closer to the tread. I re-adjusted the cable a few times but was pleasantly surprised after a bit of driving that the autotensioner was able to pull them up into a better position.

- Take a picture of the chains when you initially put them on so you can park your car with them in the same position. This will allow you to get to the back of the chain to disconnect it when there is snow/ice piled on your wheel well (see my pic). I didn't do this and found it difficult to remove the chain efficiently.

- You may still need to roll over the chain to get it off your tire so just make sure all of the plastic components and metal connectors are out of the way of your tire.

- Be cautious when connecting or disconnecting the back clip. My advice is to hold onto the chain to avoid it falling on your wheel components and potentially getting snagged.

- After one trip I can already see some rust on parts of the chain. They did use salt on the roads so just make sure you rinse the chains off when you get back and let them fully dry before long term storage.



by:

Didn’t fit the winter tires of my Subaru Forester 2018.
But since I but the chains in autumn it was too late to return them anymore.
Customer service was also useless. Asked tu about adequate sizing and they said I should call Pewag.
Actual chains are great quality and easy system.



by:

We used these chains going up to Truckee and they were the easiest chains we’ve ever installed. Highly recommended!



by:

The 2nd time I used the chains, the tensioner on one chain would not release, so I could not flip the chains off, and I had to pay a roadside chain removal guy to cut them off. The 90-day warranty seems unreasonable for the price of these chains. I'm not going to buy Pewag chains to replace them.



by:

The self tensioning feature was what made these chains attractive. After watching the installation video and practicing the installation in dry conditions a few times, I was able to easily install these chains on my Subaru in a ski resort parking lot in South Lake Tahoe, CA in the midst of a snow storm with 8 inches of snow already on the ground. Just needed to clear some of the snow away from around each front tire. Gave me lots of traction to get up and down the mountain roads.



by:

I just received the tire chains and the tag on the container that spells out the tire sizes they fit doesn't include the tire size I ordered. Its 225/75R 16. What now? We are leaving on a trip shortly and I needed those chains. Please call me asap. Thanks!!



by:

Purchased these chains for a trip to the snow and for future use after buying a new vehicle. The chains were received promptly in a well designed carrying case, with a mat, gloves, and instructions for mounting the chains. I haven't had to use them = a Subaru Forester is a great AWD vehicle and handled some pretty dicey conditions with no issue - but carry them and feel confident I can mount and dismount them quickly. Instructions are clear and simple to follow.



by:

These are for a 2005 Ford Thunderbird and are fantastic! Having had four and all-wheel drive cars for years, these make snow and ice conditions of small issue only needing good driving skills.The ease of installation is perhaps most remarkable taking under ten minutes and drive immediately without any further adjustment. Fit is superb with no impingement in what are very low clearance wheel wells.



by:

These chains are so easy to use and got me out of a few sticky situations last winter - we had an unusually high amount of unforecasted snowfall, and these chains were perfect. I gave this vehicle and the chains to my stepdaughter. Unfortunately, these chains didn't come in my new SUV's size. If they did, I would have bought these again. I did, however, buy my new self-tensioning chains in a similar pattern from the etrailer. I haven't used them yet but great service from etrailer.



by:

I have never been more pleased with a purchase decision than I am with these snow chains. They fit my car perfectly and were easier to install than I expected. If you have ever used on-ground cable chains, you know there are three connections that must be made, plus any adjustments to the tension device. With these chains, the connections are easy and the self-tightening tension device is impressive. At first I was not interested in this feature, but after using it I can appreciate how it will keep the chains tight and secure. I was also impressed by the design of the carrying case. I expected it would be difficult to replace the chains in the case once removed. Wrong. They easily fit back into the handy plastic case. Further, the chains came with plastic gloves to slip over your your hands (even with winter gloves) to keep your hands and lower arms clean. It's a bit odd to be so excited about a product that I hope NOT to use. But I drive to ski resorts all over the West and encounter chain restrictions often. Although I have all-wheel drive, I don't have snow tires and recent chain restrictions in Mammoth, CA require chains or 4-WD with snow tires on all wheels. Now, I'm actually looking forward to using the chains. I'm so pleased, I may purchase a second set for my wife's car. Finally, etrailer.com was great too work with. Their rep ( thanks Donna!) helped me find the right size chains for my wheels. Thanks so much!



by:

I got to test them out for the first time after 4 inches of snow going up a long, steep gravel road full of switchbacks and ice patches in Blue Ridge Mountains. They performed wonderfully and were pretty easy to put on. My only concern are the blue plastic parts that could be a weak point.



by:

While installing the chains for the first time, the tensioner on one of the chains broke. Thankful it happened before I was in a snow storm on a mountain. etrailer was great to work with. Issued my return and refund.



by:

It was my first time buying tire chains, and I'm glad I got them when I did. Practicing three times was enough to learn to put them on and off quickly. I drove through two blizzards with the chains. I also risked going through snow without them and got stuck, so I had to shovel my way out and try to put the chains on, which was not easy. Eventually, when I got them on, I quickly got out of the parking lot I got myself stuck in. I recommend getting them if you're expecting heavy snow because you can feel the traction, and your confidence level when on the snow is very high.



by:

These chains are amazing to say the least. 2012 GMC Terrain never needed to put chains on it, but we decided to take it on a snow trip. I have used chains in the past on other vehicles and all have been so hard to put on, on so many different levels. It made me hate to have to use them. Now the Pewag Snox Pro are the best chains I have ever used. WOW!!! They were on in less than 5-10 minutes and then taking them off was even easier. One snap of the lock, a few rough tugs, and pulled forward. Shook them of and packed them back up in the awesome case. Smooth ride considering I had chains on and great traction on snow and ice! I did not know I could love chains so much!



by:

Am an elder, live in So Cal mountains. Easy for me, at 74yrs, to install on my 2020 Subaru Forester. Thank you for good product, understandable video and great customer service.



by:

Easy to put on! I have a 2023 Toyota Sienna with original tires 235/60R18 and the pewag RS80 fit perfectly. The pictograph instructions were easy to follow and the chains were quick to get on during my test fit. The instructions being in plastic could be helpful if they get wet and I really like the self tensioning aspect of these chains.

A few notes from the Toyota Sienna manual

1. "Vehicles with 17-inch or 18- inch tires Use SAE Class “S” type radial tire chains....Vehicles with 20-inch tires Tire chains cannot be mounted. Snow tires should be used instead."
-These Pewag tire chains are "s" type and the low clearance fit my 18" wheels easily.

2. "The tire pressure warning valves and transmitters may not function correctly when tire chains are fitted."
-If your vehicle cant read your tire pressure and you have chains on...no big deal.

I really liked the ease with which these chains went on and I'm looking forward to seeing how they perform in the snow.



by:

Fit snugly. Will be a little difficult in the snow but with a pair of gloves on it is doable. The red plastic rim protectors would protect rim from metal on metal contact. However, with my M-sport rims and Pirelli Cinturato P7 tires, the red plastic doesn't even come into contact with the rim due to the extended lip of the tire...but this does mean that the chain touches the outside surface of the tire--see pics. A little off putting scarring the sticky looking surface of the tire...but it is inevitable.

On the inside of the wheel/tire, my concern was contact with the knuckle, strut, end link, stabilizer, etc. It does get close to the stabilizer end link, but doesn't touch...my pictures are shown before self centering while driving...so the spacing to end link would only get greater as I installed in worst case scenario to compare.



by:

I have yet to actually use them but the installation isn't too tricky or complex. Just make sure to follow the instructions on a dry run or two before you think you'll need them ;-)



by:

I drive a 1996 Corvette and have for the past 20 years - year round. And that makes driving near impossible in Connecticut winters and hilly terrains. Until I got my Pewag chains. When the snow accumulates, on go my Pewags and away I go. Snow covered roads, no problem, up and down hills, no problem. I can put my Pewags on both tires in less than ten minutes and I am good to go. Great product! I highly recommend Pewag chains.



by:

These are not easy to install with the wheel on the ground on a VW Jetta. I jacked up the car so there was plenty of room to work, and I could spin the tire to make the needed adjustments. Still not easy, but not bad. They work well, or at least as well as I need them to.



by:

My Mazda 3's tires are right at the top of the size range, 215/45/R18, and the tire chains fit! It was a bit hard to get them on, though. After fitting the chains loosely, we were struggling to lock the final hooks.

To lock the hooks, we ended up using one of the spare chains that came in the packaging to bridge that final 1-2 inches. Then, we drove a couple inches forward (until the we could hear the self tensioner click a couple times), and that gave us enough slack to connect the hooks without the spare chain.

I do not recommend using the spare chain to actually drive, unless they're professionally welded/attached, but they were super helpful for fitting the chains properly.

Image shows the chains mounted and the hooks properly attached, but with the auto-tensioner off.



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by:

I bought, hoping never to use. But, if in a pinch, I wanted something that was simple to install and self tightening. I installed once just for practice, and to insure it was the proper fit. The Town & Country does not have a lot of front wheel well clearance, and this choice fits well.



by:

I am not very handy and have no intention of installing my chains on the side of the interstate myself if I can help it. I chose these because they are self-tensioning and can be put on without laying on the ground to install them. I tested installing them twice at home, so I am ready in case of emergency when I visit the seirra's this winter.


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See what our Experts say about this pewag Tire Chains

  • Recommended Tire Chains for 2018 Subaru Outback Wagon
    I took a look at the online version of the owner's manual for your 2018 Subaru Outback and it does state that the vehicle has very limited wheel well clearance. This means you will want to go with a tire chain set that is Class S compatible, which simply indicates that they are specifically designed for vehicles like yours and will require very little clearance to install. It also states that traction devices should only be used on the front tires. I do recommend checking your copy of...
    view full answer...
  • Tire Chains for 2017 and 2022 Subaru Outback With 225/65R17 Tires
    Hi Roger; all of these are Class S compatible so while clearance varies slightly it will be comparable between the ones you're looking at. If you're looking for something that will work in an emergency, and you are getting these because they're required, the Titan Chain Cable Tire Chain # TC343DC is the best choice. These are actually cables which is why the cost is so low. Most people get cable because they have to have them but really don't intend on using them. If you plan to use them...
    view full answer...
  • What is The Difference Between pewag Servo RS Tire Chains # PWRSV79 & # PWRS79 for 2023 Outback Wild
    The pewag Servo RS Tire Chains # PWRSV79 have a thicker chain link of 3.5mm where the Chains # PWRS79 are 3.2mm thick. Both sets are going to be S-class rated which according to the owners manual for your 2023 Subaru Outback Wilderness will allow them for use on your front wheels only.
    view full answer...
  • Tire Chains Recommendation For A 2022 Subaru Outback Wagon
    For your 2022 Subaru Outback Wagon, I recommend the pewag Servo RS Self-Tensioning Snow Tire Chains # PWRS79. These chains are self tensioning, meaning it will self tighten during installation, so there is no manual tensioning needed. These chains will also work great in deep snow, that will provide superior traction and a smooth ride.
    view full answer...
  • Recommended Snow Tire Chains for 2019 Subaru Outback with 225/65R17 Tires
    When the law requires use of snow chains, it trumps the manufacturer. So in these cases, I recommend using Class S chains which are minimal clearance chains to give you traction and yet avoid issues with internal clearances. For your 225/65R17 tires on your 2019 Subaru Outback, I recommend the Pewag Servo RS Self-Tensioning Snow Tire Chains - 1 Pair # PWRS79. These chains will install easy and will require only 15 mm or .59 inches of internal clearance between the tire's sidewall and...
    view full answer...
  • Do Tire Chains for 2022 Subaru Outback Wagon Work with ABS and AWD
    The tire chains part # PWRS79 that fit the tire size of 225/65-17 that you have on your 2022 Subaru Outback Wagon are totally fine to use with AWD vehicles with ABS systems. Like with any winter driving your ABS system is probably going to be working differently in the snow but the chains will give you a ton more traction. AWD is not an issue at all. I attached an install video for these chains on a similar Outback for you to check out as well.
    view full answer...
  • What Tires on 2019 Subaru Outback Should Tire Chains be Used on
    I used a search engine to look up the owner's manual of your 2019 Subaru Outback and it stated on page 8-12 to use a traction device on the front wheels only, so you do not need chains for all four wheels. It also states you need to use a Class S traction device to ensure clearance and that you can't use normal steel chains, but you can use self-tensioning chains (these will be tight around your tire which means they will give you the clearance needed not to hit your Outback's wheel well). The...
    view full answer...
  • Recommended Snow Cable Tire Chains for 2018 Subaru Outback Wagon
    The owner's manual for your 2018 Subaru Outback specifically states that traditional chain link style Tire Chains should not be used because of the lack of clearance to the wheel well and between the inside of the wheel well and the suspension/braking components. It goes on to say that Class S cable chains are acceptable, and should only be used on the front wheels. I'd recommend going with the Titan Chain # TC343DC Diagonal allow Cable Snow Chains, which is a fit for your tire size. The...
    view full answer...
  • Do Pewag PWRS79 Servo Tire Chains Carry a Speed Restriction
    You wouldn't want to drive any faster than 30 mph with Pewag # PWRS79 Pewag Servo installed. The same would hold true with any tire chain. One of the main reasons for this speed prohibition is the fact that if the chain should fail, it would sling around and severely damage the vehicle. I've linked to a demonstration video for the Pewag # PWRS79 Servo Snow Chains.
    view full answer...

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Lindsey S
Edited by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
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Employee Shelly K
Written by:
Shelly K
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
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Employee Mark S
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Employee Kurt W
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