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Kingboss G866

Ultra High Performance Summer Tested by Tire Reviews

The Kingboss G866 is a Ultra High Performance Summer tire designed to be fitted to Passenger Cars.

The quick answer

Owners say No owner reviews yet. Review this tire
Tests say 8th average finish across 1 independent tests Latest: P8 of 8 · 2026 See every test
Strengths & weaknesses Value, Wet Comfort Relative to its rivals across every test we hold

Built from every independent test result and vetted owner review we hold for this tire - the evidence is all further down the page. Data updated March 2026.

  • 1professional tests
  • 132sizes available
Kingboss G866 2 photos

Tire Reviews Score

Kingboss G866

4.4/10

Better than 10% of summer tires

  • Limited Confidence
  • 1 test
Scores of the 406 summer tires we have tested

How this score is built

Better than Weight
Independent tests1 test · 1 publication · 2026 10% 100%
Owner reviewsNo owner reviews yet – 0%
Combined 10% 4.4

A fixed curve turns the combined figure into the 0 to 10 score, so roughly the top 10% of a group score 9 or more.

Category by category

How it compares with other summer tires in each area, and how much each area counts. 50 is the middle of the group.

Category Better than Weight Tests
WetBraking, handling and aquaplaning in the wet 14% 44% 1
DryBraking and handling on dry roads 11% 40% 1
ValueWear, efficiency and cost 59% 9% 1
ComfortNoise and ride comfort 9% 7% 1

Faded bars rest on one or two tests.

By discipline

The same results grouped by what the tire was doing. They are not counted a second time.

HandlingEvery handling test, on any surface 11% 1
BrakingEvery braking test, on any surface 10% 1

Confidence

  1. Limited
  2. Medium
  3. High

Its own test results decide 89% of the test figure. The other 11% is the average for its group, and it shrinks as more tests arrive.

High needs at least 3 tests, with its own results deciding 90% or more. Medium needs 2 tests and 70%. Anything less is Limited: expect the number to move as tests arrive.

The tests behind it

  1. 2026 The BEST Performance Summer Tires for 2026 Tested! Tire Reviews · 235/35 R19 P8 / 8
All Tests
View Test Results
1 Tests
0 Test Wins
8th Average
8th Best
8th Worst
The latest test

The BEST Performance Summer Tires for 2026 Tested! P8 of 8

Not much to say about the King Boss G866. If you're an enthusiast, do not fit this tire. Come to think of it, if you're a regular person, do not fit it either. It's just bad in the wet.

Strong: Subj. Comfort, Rolling Resistance Weak: Dry Braking, Dry Handling, Subj. Dry Handling, Wet Braking, Wet Handling, Subj. Wet Handling, Straight Aqua Winner: Pirelli P Zero R

YearTestResultAward
2026The BEST Performance Summer Tires for 2026 Tested!Tire Reviews · 235/35 R19P8 / 8Tested by Tire Reviews

Videos

Kingboss G866 Video
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Rim Protection
Small

A modest lip. Enough for a slow scrape against a kerb, but it will not save a wheel from a real hit.

Assessed by eye on the tires we tested, in the sizes listed. No manufacturer publishes rim protection as a specification, so treat this as a guide rather than a measurement.
Dimensions & Label Scores
View All

Size Range116 sizes available

195-315Width30-65Profile15-22Rim82-120 V-YLoad/Speed Index2021First On Market

EU LabelAcross 116 sizes - the grade depends on the size you buy.

Noise

71-75dB

Popular sizes195/45 R15195/45 R16205/45 R16205/50 R16215/45 R16225/55 R16
Frequently Asked Questions
How good is the Kingboss G866 in the wet?
Across the 1 wet-braking test it has featured in, the Kingboss G866 stops 21.8% longer than premium rivals and 19.7% longer than mid-range rivals. It has a Tire Reviews wet score of 14/100.
How good is the Kingboss G866 in the dry?
Across the 1 dry-braking test it has featured in, the Kingboss G866 stops 17.1% longer than premium rivals and 14.3% longer than mid-range rivals. It has a Tire Reviews dry score of 11/100.
How fuel efficient is the Kingboss G866?
Across the 1 test measuring rolling resistance, the Kingboss G866's rolling resistance is 8.3% lower than premium rivals and 8.3% lower than mid-range rivals.
What is the Kingboss G866's EU tire label rating?
Across its range, the Kingboss G866 most commonly carries EU label ratings of D for fuel efficiency, C for wet grip and 72 dB for noise.
Does the Kingboss G866 have a rim protector?
Yes. Rim protection on the Kingboss G866 is small, measured in 235/35 R19. No manufacturer publishes rim protection as a specification; this is assessed by eye when the tires are mounted for our own testing. The BEST Performance Summer Tires for 2026 Tested!
More questions about the Kingboss G866 (1)
What sizes does the Kingboss G866 come in?
The Kingboss G866 is available in 132 sizes, ranging from 195-315/30-65 R15-22.
Owner Questions
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