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Sumitomo High Performance HTR Z II Tire - 275/40-18 (05-14 All)

50 Reviews
Our Price


  • Item #63009
  • MPN# 5517780

  • Market Price $156.99
  • You Save 17% ($26.00)
  • Add FREE Mounting and Balancing?

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Product Videos Customer Photos
  • Uncompromising Traction and Handling
  • Excellent Anti-Hydroplaning Characteristics
  • Smooth Ride; Minimal Road Noise
  • Unique Flanged Lip Protects Rims
See our 2005 V6 Project Car Now

Sumitomo's HTR Z II series tire is an ultra high performance summer tire. The aggressively designed 275/40ZR18 delivers extraordinary performance in either wet or dry conditions, on and off the track.

Uncompromising traction and handling. The HTR ZII's extra wide, arched tread blocks deliver uncompromising racing slick-like dry traction and handling. Dual steel belts with spirally-wrapped Jointless Nylon Band reinforcements deliver high-speed stamina and predictable handling, while still minimizing weight and right uniformity. Single Strand Beads help improve wheel fit and retain rigidity under high stress cornering.

Excellent anti-hydroplaning characteristics. Multi Directional Water Channels push water to the sides and away from the center providing excellent hydroplaning resistance and road grip in adverse weather conditions.

Smooth ride; minimal road noise. In addition to outstanding performance, the HTR Z II Series Tires deliver a smooth ride with minimal road noise. That way you and your passengers can be treated to the sounds that really count, like the growl of your motor, the whine of your supercharger, or the bass thumping from your Mach 1000 stereo system!

Unique flanged lip protects rims. The HTR Z II Series Tires also feature a unique flanged lip on the lower sidewall that helps protect your expensive rims from curb damage while parallel parking.

5 Year Warranty. This Sumitomo Tire comes with a 5-year warranty from the date of purchase. Some limitations do apply. Please see the Full Sumitomo Warranty disclosure for details.

Best Fit: 18 x 10 Inch 2005+ Wheels

  • Wide block shoulder stabilizers strengthen shoulders for maximum dry grip and greater, more predictable, steering response for cornering control.
  • Full-width, high density steel belts promote stable, predictable handling, smooth ride, even tread wear, and superb uniformity .
  • PSP Technology optimizes overall casing durability throughout the life of the tire

NOTE: These are ultra high performance summer specific compound and tread tires. Use during the summer and warm temperature months will result in superior traction over “all season” tires. Use during the winter months/cold temperatures significantly reduces traction and increases stopping distance as the compound becomes less sticky.

Fitment: 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Details

Free Mounting & Balancing: Professional mounting & balancing is available on all wheels and tires when purchased together on the same order, so you can just swap your wheels in your driveway when they arrive. We even offer Free Nitrogen tire fill (see option above).

  • FREE Mounting and Balancing in 48 hours
  • State of the Art Onsite Tire Facility
  • Scratch-Free process + Hidden Weights
  • TPMS Sensors installed free on 07+ Mustangs (see wheel page for details)
  • Free Shipping on any order to the continental 48 states
  • Please allow an extra 1 to 2 business days on your wheel and tire package for mounting and balancing

Free Nitrogen Fill! AmericanMuscle is proud to bring you the option to fill your tires with pure nitrogen for FREE when we mount & balance your wheel and tire order. Filling your high performance tires with nitrogen has many benefits including:

  • Improves Fuel Economy
  • Cuts down weight
  • Preserves your tires for longer life
  • Tire Pressure is better equalized throughout the year
What's in the Box
  • (1) Tire
Tech Specs
  • Hydroplaning Resistance: 8.0
  • Wet Traction: 8.0
  • Dry Traction: 9.0
  • Snow Traction: N/A
  • Ice Traction: N/A
  • Steering Response: 8.6
  • Cornering Stability: 8.6
  • Ride: 8.2
  • Noise: 8.1
  • Tread Wear: 7.4

KEY: 10-8.6 Oh Yeah!, 8.5-6.6 Above Average, 6.5-4.6 Average, 4.5-2.6 Acceptable, 2.5-0 Unacceptable
Will it fit my Mustang?
  • Boss 302 - 12, 13
  • V6 - 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
  • Bullitt - 08, 09
  • GT - 05, 06, 07, 08, 09, 10, 11, 12, 13, 14
  • GT500 - 07, 08, 09, 10, 11, 12, 13, 14

Most Helpful Reviews

Buy from AmericanMuscle

These guys are great...superfast free shipping and the cheapest than anywhere else on the internet...In these times its nice to now that a company like American Muscle will look out for us and do the right ...

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Helpful (1)


Got tires and wheels already mounted. Tires are great. Super traction in dry or wet conditions and ride very smooth. They also look great on the Mustang, great deal would buy again.

Helpful (10)

Overall Rating 4.7 out of 5 stars
Read All 50 Reviews

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4 Questions / 1 Answers

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  • I assume you are running an 18x9 wheel on the tire size you are currently using. That is the largest size for an 18x9 that we recommend for proper fitment. This 275/40-18 tire would be too large and should be combined with an 18x10 wheel instead.


    Good Answer (0) (2)

Question Resolved

Will these tires fit? Will these tires fit on 18 x 10 wheels on the rear of a 1991 mustang gt with 1.5 inch lowering springs without modification? If not, any recommendation on what size tire i would need? Also the size tire i would need for 17 x 9 on the front? I have a 5 lug conversion set up too if that helps.


Answer This Question I need this answered (0) (0)

Can you advise on the Speed Rating Value of these Tires? Are they W, Y???? Also, can you advise on typically how long the tread life is on these tires assuming someone is not track racing, auto cross racing and or doing burn outs?


Answer This Question I need this answered (0) (0)

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Customer Reviews (50) Write a Review

Overall Rating 4.7

out of 5 stars

  • Dry Traction 4.710526 4.7
  • Wet Traction 4.361111 4.4
  • Tread Apperance 4.947369 4.9
  • Ride Quality 4.5 4.5
  • Bang For Your Buck 4.736842 4.7

  • 5/5

    July 08, 2012

    Buy from AmericanMuscle

    These guys are great...superfast free shipping and the cheapest than anywhere else on the internet...In these times its nice to now that a company like American Muscle will look out for us and do the right thing and save us some money thanks AM...As for the tire theyre great and I own a Vette not a Mustang but tires are all the same...Thanks again AM I'll be back when i need front tires.


    Year: 2004 Model: Other Farmingville, NY, USA

    Helpful (1) (0)

  • 5/5

    October 14, 2007


    Got tires and wheels already mounted. Tires are great. Super traction in dry or wet conditions and ride very smooth. They also look great on the Mustang, great deal would buy again.

    Sam Kilby

    Helpful (10) (0)

  • 5/5

    September 01, 2010

    Nice tires

    Got these mounted with a rear set of 2010 gt500 wheels, looks great, great traction and a great price. Well worth it, thanks AM


    Year: 2010 Model: GT

    Helpful (7) (0)

  • 5/5

    March 30, 2009

    Awesome Tires

    Purchased 4 of these brand new for 18x9.5 wheels. Work amazing on them. Great improvement over stock tires in both wet and dry conditions. No hydroplaning at all. Will buy again when time to replace tires. Great deal on the tires, with free shipping from AM.

    Kyle Britton

    Helpful (9) (2)

  • 5/5

    July 19, 2011

    Great Tires

    Outstanding tires for cheap! 235/50/18 in the front & 275/40/18 in the rear. They look beast on my 06 GT, Thanks American Muscle!


    Year: 2006 Model: GT Driving Style: Daily Driver

    Helpful (5) (0)

  • 5/5

    June 12, 2012

    Amazing Dry Traction! Best Cornering Tire!

    I purchased 275 40 18 HTR Z II about 3 weeks ago I have been pushing thes tires in the corners to test how good they are. I'm able to take corners that I know the rearend would have kicked out on me with my Perelli tires that where brand new when I purchased my mustang with only 25,000 Miles on it. I have found that the wet traction is good but I did slid once on a wet painted line when I was driving to fast and had to stop fast. So tried several 50 mph hard stop in pouring down rain and the have not slid at all and was able to stop just as fast as in the dry. these tire have the best cornering grip of any tire have ever driven on


    Year: 2005 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 2 Washington State

    Helpful (5) (2)

  • 3/5

    August 31, 2013

    Sumitomo's just ok

    To start off, I ordered these tires along with a set of 2010 GT500 black machined rims for my 2011 v6. They were a lot better than the stock Michelin tires that came with the car. They felt great except for that I was getting vibrations above 70 mph. I thought at first this was maybe due to the dynotech driveshaft that I installed on my v6. This was not the case however, because when I switched back to the stock tires I had no vibrations. Long story short, I traded in my 6 banger for a 2014 GT recently and remounted the Sumitomos. Got the same vibrations at over 70 mph. I did some research online and found out this issue was caused to my tires not being balanced properly. I took my new GT to a local tire shop and had the tires rebalanced. Now all vibrations are gone. There is one other issue I have now, traction. The new GT's have a lot of torque and it is really easy to break these tires loose in first. I feel like they are on par with the stock pirellis, even with the wider contact patch (275 in the rear). Don't get me wrong, these tire look nice, and perform well in both dry and wet conditions. But if you get on the throttle, they will just spin. I wish I would have spent the extra money to get Nitto's or Mickey Thompsons.


    Year: 2014 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 Chicago, IL

    Helpful (2) (0)

  • 5/5

    January 22, 2013


    Big sticky tires add an aggressive look as well as wonderful functionality. For someone as frugal as I am, I can say I have not the slightest regret purchasing these tires.


    Year: 2006 Model: V6 Driving Style: Daily Driver 'Stangs I have owned: 1

    Helpful (2) (0)

  • 5/5

    January 22, 2013

    best bang for your buck

    went from nitto 555's these are almost same on bry and better on wet


    Year: 2006 Model: GT Driving Style: Daily Driver 'Stangs I have owned: 2 San Jose, CA, USA

    Helpful (2) (0)

  • 5/5

    September 01, 2010

    Great Deal

    Great tires and equally great deal. They ride nice with great traction. No vibration or road noise. Pretty firm in corners (though I havent put them to the test yet). Great tire for the money


    Driving Style: Daily Driver

    Helpful (3) (1)

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