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Solus KR21

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  • Size: P225/60R17
  • Sidewall Style: Blackwall
  • Serv. Desc: 98T
  • UTQG: 640 A B
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Tire Rack Test ResultsKumho Solus KR21

August 1, 2007

Tires Tested
Dunlop Signature (Standard Touring All-Season 205/55R16)

  • What We Liked: Overall road manners and compliant ride quality
  • What We'd Improve: Wet traction and responsiveness
  • Conclusion: Appears to emphasize road comfort over traction, especially in the wet
  • Latest Test Rank: 4th
  • Previous Test Rank: Not previously tested
General Altimax RT (Standard Touring All-Season 205/55R16)
  • What We Liked: Wet and dry traction with competitive ride comfort
  • What We'd Improve: A slight reduction in road noise
  • Conclusion: A Standard Touring All-Season tire with very good traction
  • Latest Test Rank: 1st
  • Previous Test Rank: Not previously tested
Kumho Solus KR21 (Standard Touring All-Season P205/55R16)
  • What We Liked: Competitive road manners and noise
  • What We'd Improve: Wet traction and predictability
  • Conclusion: Economical Standard Touring All-Season tires
  • Latest Test Rank: 3rd
  • Previous Test Rank: Not previously tested
Pirelli P4 Four Seasons (Standard Touring All-Season P205/55R16)
  • What We Liked: Responsive road handling, good dry grip and wet traction
  • What We'd Improve: A slight enhancement of road comfort and traction
  • Conclusion: A capable Standard Touring All-Season tire
  • Latest Test Rank: 2nd
  • Previous Test Rank: Not previously tested

Vehicles Used
2006 BMW E90 325i Sedan

Intended for use on sedans, coupes, minivans and crossover vehicles, Standard Touring All-Season tires are designed to combine good ride comfort, low noise levels, long wear and year-round traction, including in light snow. Standard Touring All-Season tires are typically available in the S- and T-speed rated sizes and place more emphasis on ride comfort and long treadwear compared to their higher speed rated Grand Touring All-Season tire cousins.

While the introduction of new tire designs isn't that uncommon, the fact that four tire manufacturers introduced Standard Touring All-Season tire lines at about the same time is unusual. Therefore the question we needed to answer was, "Did any of the manufacturers successfully build a better mousetrap or are these new tire lines simply four of a kind?" In order to find out how well these tires fit the Standard Touring All-Season tire category and determine any differences in their capabilities, Tire Rack team conducted a Real World Road Ride and Performance Track Drive of the Dunlop Signature, General Altimax RT, Kumho Solus KR21 and Pirelli P4 Four Seasons tires.

Our evaluation used a 2006 BMW 325i E90 sedan, with new, full tread depth 205/55R16 tires mounted on 16x7.5" wheels.

What We Learned on the Road

Our 5.6-mile loop of expressway, state highway and county roads provides a great variety of road conditions that include city and highway speeds, smooth and coarse concrete, as well as new and patched asphalt. This route allows our team to experience noise comfort, ride quality and everyday handling, just as you would during your drive to school or work.

All four tires delivered ride comfort that was appropriate for the Standard Touring All-Season tire category and helped absorb the expansion joint impacts and pothole repairs along our ride loop. The Dunlop Signature earned our team's respect for its ride quality, followed closely by the Pirelli P4 Four Seasons, Kumho Solus KR21 and General Altimax RT.

Computer-tuned tread designs help reduce tread noise from today's Standard Touring All-Season tires and all four tires delivered appropriate noise qualities. The Dunlop Signature again offered a small advantage, followed by the Kumho Solus KR21, Pirelli P4 Four Seasons and General Altimax RT.

Because Standard Touring All-Season tires are not asked to corner at their limits during normal service, they are typically designed to combine predictable handling with year-round traction. Again all four tires also delivered real-world handling qualities appropriate for their category, however this time it was the Pirelli P4 Four Seasons that offered a small advantage over the group thanks to its quicker response to the driver's steering input, followed by the Kumho Solus KR21, General Altimax RT and Dunlop Signature.

What We Learned on the Test Track

While the test track is where many of the performance tires confirm their capabilities, it isn't the natural habitat for Standard Touring All-Season tires. Our 1/3-mile per lap course includes 90-degree street corners, lane changes and simulated expressway ramps. Run in both dry and wet conditions, the test track allows our team to experience the traction, responsiveness, handling and drivability normally only encountered during abrupt emergency avoidance maneuvers.

In the dry, the General Altimax RT proved quickest overall, providing predictable handling and consistent grip. The Pirelli P4 Four Seasons and Kumho Solus KR21 lapped our course less than 2/10ths of a second slower than the General tires, however the Pirelli tires offered better balanced handling while the Kumho tires slid easier when braking and were easier to spin when pushed to their limits during acceleration. The Dunlop Signature tires that were most comfortable on the road felt the least responsive of the group and lapped 4/10ths of a second behind the General.

In the wet, the General Altimax RT also proved quickest overall by providing confident traction and predictable handling. The Pirelli P4 Four Seasons' handling was predictable, but it could not match the General tire's grip. The Pirellis were 1.2 seconds off the pace. The Kumho Solus KR21 couldn't match the Pirelli's traction or predictability and it was again ranked third, 1.6 seconds behind the General. The Dunlop Signature tire's low level of wet grip allowed our team members to reach its cornering and braking limits noticeably earlier than the other three tires in this test and the Signature turned laps a significant 3-seconds slower than the leader.

Product Details

Dunlop Signature (Standard Touring All-Season):
Signature tires are designed to combine touring ride comfort with long wear by providing the handling and confident cornering that enhances the connection between the driver and the road, along with the appropriate year-round traction, even in light snow. Read more.

General Altimax RT (Standard Touring All-Season):
The Standard Touring All-Season tire member of their Altimax family of flagship tires the Altimax RT is a stylish touring tire designed to combine reliability, comfort and tread life, as well as year-round traction, even in light snow. Read more.

Kumho Solus KR21 (Standard Touring All-Season):
The Solus KR21 utilizes Kumho's newest compounding technology and is designed to offer a balance of long wear, low noise and good ride, with competitive handling and all-season traction, even in light snow. Read more.

Pirelli P4 Four Seasons (Standard Touring All-Season):
The P4 Four Seasons is the newest Pirelli tire that is truly dedicated to perform in all four seasons and is designed to provide ride comfort, reduced noise and long treadwear with traction in wet weather and snowy conditions. Read more.

Read Full Report

Ratings & reviews Kumho Solus KR21

Based on 1,562 submissions of our online survey.
  • WET
  • Hydroplaning Resistance Wet Traction
  • 7.8 7.9
  • DRY
  • Cornering Stability Dry Traction Steering Response
  • 7.9 8.5 8.1
  • Light Snow Traction Deep Snow Traction Ice Traction
  • 7.3 6.6 6.3
  • Ride Quality Noise Treadwear
  • 8.0 7.7 7.0

Note: Consumer Survey Ratings are from 0-10 with 10 being the highest.

  •  Superior (8.6 - 10)
  •  Excellent (6.6 - 8.5)
  •  Good (4.6 - 6.5)
  •  Fair (2.6 - 4.5)
  •  Unacceptable (0 - 2.5)


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