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Primewell PS850

Primewell Tires Touring All Season

The Primewell PS850 is a Touring All Season tire designed to be fitted to Passenger Cars.

6.2
Tire Reviews Score Based on User Reviews
Limited Confidence View Breakdown
Dry Grip
58%
Wet Grip
60%
Road Feedback
42%
Handling
38%
Wear
48%
Comfort
50%
Buy again
35%
6 Reviews
47% Average
39,400 miles driven
Primewell PS850

Primewell PS850

All Season Budget
BETA
6.2 / 10
Based on User Reviews · Limited Confidence · Updated 23 Feb 2026

The Tire Reviews Score is the most comprehensive tire scoring system available. It aggregates professional test data from multiple independent publications, user reviews, and consistency analysis using Bayesian statistical methods, weighted normalisation, and recency-adjusted scoring to produce a single, reliable performance rating.

Learn more about our methodology
Score Components
Professional Tests
Weight: 80%
Tests: 0
Publications: 0
User Reviews
Weight: 15%
Reviews: 6
Avg Rating: 47.4%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 2.48
History Points: 10
Methodology & Configuration
Scoring Process
  1. Collect Test Data: Gather results from professional tire tests across multiple publications. Minimum 1 test(s) required.
  2. Normalize Positions: Convert test positions to percentile scores using exponential weighting (factor: 1.2).
  3. Apply Recency Weighting: More recent tests are weighted higher with a decay rate of 0.95.
  4. Incorporate User Reviews: Factor in user review data (minimum 5 reviews). Weight: 15%.
  5. Bayesian Smoothing: Apply Bayesian prior (score: 7, weight: 1.5) to prevent extreme scores with limited data.
  6. Calculate Final Score: Combine all components using normalization factor of 1.1. Max score with limited data: 9.5.
Component Weights
Test Data
80%
User Reviews
15%
Consistency
5%
All Configuration Parameters
ParameterValueDescription
safety_weight 0.7 Weight multiplier for safety-related metrics
performance_weight 0.55 Weight multiplier for performance metrics
comfort_weight 0.4 Weight multiplier for comfort metrics
value_weight 0.45 Weight multiplier for value-for-money metrics
user_reviews_weight 0.15 How much user reviews contribute to the final score
test_data_weight 0.8 How much professional test data contributes to the final score
consistency_weight 0.05 How much score consistency contributes to the final score
recency_decay_rate 0.95 Rate at which older test results lose influence (higher = slower decay)
min_test_count 1 Minimum number of professional tests required
min_review_count 5 Minimum number of user reviews required
score_version 1.9 Current version of the scoring algorithm
score_normalization_factor 1.1 Factor used to normalize raw scores to the 0-10 scale
confidence_factor_weight 0.2 How much data confidence affects the final score
position_penalty_weight 0.2 Penalty applied for poor test positions
gap_penalty_threshold 12 Score gap (%) that triggers additional penalties
min_metrics_count 2 Minimum number of test metrics needed per test
limited_data_threshold 2 Number of tests below which data is considered limited
single_test_penalty 0.75 Score multiplier when only one test is available
critical_metric_penalty 0.7 Penalty for poor performance on critical safety metrics
critical_metric_threshold 70 Score below which a critical metric penalty applies
position_exponential_factor 1.2 Exponent used to amplify position-based scoring
position_exponential_threshold 0.9 Position percentile below which exponential scoring applies
gap_multiplier_critical 3 Multiplier for critical gap penalties
max_category_weight 2 Maximum weight any single category can have
max_score_limited_data 9.5 Score cap when data is limited
bayesian_prior_weight 1.5 Weight of the Bayesian prior in smoothing
bayesian_prior_score 7 Prior score used for Bayesian smoothing
evidence_test_multiplier 1.9 Multiplier for test evidence in confidence calculation
evidence_metric_divisor 3 Divisor for metric count in evidence calculation
evidence_review_divisor 10 Divisor for review count in evidence calculation
combined_penalty_floor 0.2
All Tests

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Top 3 Primewell PS850 Reviews

Given 53% while driving a Triumph Spitfire 1500 (155/80 R13) on mostly town for 1,000 average miles
Got these on an older classic car. Previous owner mentioned they were ok, but I'd probably want to change them. Boy, was he right. They're tires in the academic sense - they're black, round, and made of rubber. You can put air in them and drive the car. But the sidewall flex on these things is absurd. Going around normal intersection turns, the back end felt like it was squishing around on water balloons to the point that passengers with no deep car knowledge commented on it. The tires being still relatively new, I thought the rear suspension was in need of a refresh, but when I started getting into it, I discovered it had recently been already done. So I gave the car a hip bump on the side, and was surprised at how much lateral movement occurred from the sidewalls of these tires. I'm not terribly hard to please when it comes to a car that only sees occasional use, but I'll be replacing these in the spring for any tire at all that doesn't make me feel like the whole back end of the car is coming loose.
Helpful 685
November 8, 2022
Given 36% while driving a Volkswagen (225/45 R17) on a combination of roads for 10,000 spirited miles
Budget tire put on by a previous owner to pass an MOT. Totally ruined the cars handling characteristics and wet grip not great. Wore out on front very quickly, very little feedback/progressiveness. Cheap tire and it shows.
Helpful 562
September 14, 2015
Given 74% while driving a Dodge Caravan (215/70 R15 T) on mostly country roads for 3,000 average miles
Good tire.
Helpful 565
January 4, 2013

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Latest Primewell PS850 Reviews

Given 86% while driving a Citroën berlingo (225/45 R17) on a combination of roads for 15,000 easy going miles
When I purchased my car 18 months ago these were fitted and new. When I drive I don't try to brake any land speed records, they perform well for the average driver. Dry, wet and snow they perform as they should. My previous car with premium branded tires in the snow could not get me up the to my house, my new car with these fitted has no problems handling the snow and ice on the hill that I live on. I have driven 15,000 miles and the fronts still have 5.5 - 6mm of tread left on them. I would think about using these tires again.
Helpful 568
July 25, 2012
Given 16% while driving a Fiat Panda (155/80 R13 T) on a combination of roads for 10,000 spirited miles
Fronts worn out after 10k on a Fiat Panda - very unimpressed.

Extremely noisy and very uncomfortable. Even at £30 a pop they#re a lot of money - avoid.
Helpful 498
January 15, 2012
Given 13% while driving a Vauxhall Astra 1.7 CDTI (225/45 R17) on a combination of roads for 400 average miles
OK for the chuckle brothers.
Helpful 509
April 16, 2011
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