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Bridgestone Battlax BT 021

The Bridgestone Battlax BT 021 is a High Performance Summer tyre designed to be fitted to Motorcycles.

6.2
Tyre Reviews Score Based on User Reviews
Limited Confidence View Breakdown
Dry Grip
86%
Wet Grip
71%
Road Feedback
76%
Handling
74%
Wear
79%
Comfort
79%
Buy again
59%
10 Reviews
75% Average
72,250 miles driven
Bridgestone Battlax BT 021

Bridgestone Battlax BT 021

Summer Premium
BETA
6.2 / 10
Based on User Reviews · Limited Confidence · Updated 23 Feb 2026

The Tyre Reviews Score is the most comprehensive tyre 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: 10
Avg Rating: 74.7%
Min Required: 5
Consistency
Weight: 5%
Score Std Dev: 0.11
History Points: 10
Methodology & Configuration
Scoring Process
  1. Collect Test Data: Gather results from professional tyre 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

Sorry, we don't currently have any magazine tyre tests for the Bridgestone Battlax BT 021

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Questions and Answers for the Bridgestone Battlax BT 021

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May 21, 2016

What should the tyre pressure be for a ducati multistrada 1000ds 2005, ducati list 32 front & 36 psi rear

Always start with the bike manufacturers suggested pressure, then try adjusting them a few PSI either way to see if there's a better balance for your riding style.
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Top 3 Bridgestone Battlax BT 021 Reviews

Honda CB600FA Hornet (180/55 R17) on mostly motorways for 18,000 average miles
Since i bought my cb600 Hornet 2012 it was fitted with those heavy tyre, I did change it at 18000 (1500 after i bought the bike) central of the tyre was almost flat but still a lot on left and right side, Im going to change it again after almost a year know and 32000ml on a clock, not bad 14000miles with it but still the same problem both sides still very good and central flat, due of taking the motorway every day but still going for the same I'm quiet happy with those
October 6, 2017
Given 76% while driving a Honda New Civic SI Brazil (160/60 R17) on mostly town for 13,750 spirited miles
Grip great - wet or dry. Found that the tire was a bit of a hard ride though. Had excellent wear - 22000km mostly commuting in heavy traffic!
October 9, 2017
Given 66% while driving a Suzuki SV650S (160/60 R17 W) on a combination of roads for 12,000 average miles
Horrible just horrible. I fitted these to the SV650S I had thinking they would be as good as the BT020's. They were not, avoid at all costs. No wet grip and barely any dry, feedback was bad then they would let go. The turn in was hard and seemed like they tried to fight it till it then flopped over. I had no confidence in these tyres at all. Unfortunately they lasted 12000 miles and I had to put up with them. Buy something else!
May 1, 2015

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Latest Bridgestone Battlax BT 021 Reviews

Given 69% while driving a Honda cb 600 f hornat (120/70 R17 W) on a combination of roads for 4,000 spirited miles
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March 20, 2014
Given 84% while driving a Suzuki Bandit 1200 S (180/55 R17 W) on a combination of roads for 0 spirited miles
I never read the opinions about these so my feelings are unaffected by what others think - I ride a big bandit and I ride it hard. I used 021 on the front and rear. The bike never seemed unstable or unpredictable. The grip is excellent in corners even when it's cold the rear would not slip when I throttled out. I ride aggresively and try to push the limits - never had serious situation. the front however was eaten up quite quickly - I did 3,5kkm and the sides got slick. The top of the tyre was still ok.
I didn't get another set as I went for 023 instead. I would recommend 021 for heavy bikes and for riders who want a good grip in the corners and decent wear. I never go extreme in the rain so I can only tell that when you use your head while riding on wet there's little probability that these tyres will surprise you.
October 8, 2013
Given 96% while driving a Suzuki GsxR 600 (180/50 R17) on a combination of roads for 2,000 spirited miles
i"ve only been riding for 2 years now,but i have done some miles,i"ve done around 45k,and it"s Bridestone every time for me,they have never let me down yet(touch wood)....Ha,they do what there meant to do and that means stick to the road and keep you on the bike,i ride very hard and i use all of the tire,i go out with a lot of experienced riders who also like to ride hard,and with Bridgestone 21s i feel just as confident as they do,and also to be honest i don"t really ride that much in the rain,but when i do i take it easy (i think) Ha and again there doing a perfect job ...............Defo recommend this tire
February 28, 2013
Given 100% while driving a Aprilia SL1000 Falco (225/45 R17) on mostly motorways for 6,000 spirited miles
I bought these because of the Mixed compounds as I am forced to do a lot of motorway riding. But when I can I love the lanes. I have a pair of BT021's and although maybe I haven't pushed them to their absolute limit, I don't hang about and they have given me nothing but confidence. And just to point out, there are no chicken strips on the sides!
I recently took part in a BikeSafe day with the Met Police and it rained and rained all day. I have never pushed a bike so hard in the rain before, even very very late braking, nearly missing a turning and the tyres never gave a hint of trouble.
On the motorways, well I don't hang about and the rear tyre has lasted well considering, only just starting to square off, but dont let that put you off.
Overall a great allrounder that I would buy again.
September 2, 2012
Given 77% while driving a Kawasaki ER6F (160/45 R17) on mostly country roads for 4,500 average miles
I've seen a lot of reviews of these tyres and they have been pretty shocking. I think this is partly down to people running the wrong pressures. The Kawasaki manual recommends 32psi front and 36psi rear. Running these pressures the tyres are shocking, to the point of not wanting to ride at all. However I emailed bridgestone and they told me the pressures I should be running. This has transformed the bike beyond belief. Lots of grip wet or dry, and I'm looking to hopefully get 5500 miles out of them. I wouldn't get them again as I want to try roadsmarts, but if I bought a new bike and 021s were fitted I'd leave them on.
June 26, 2012
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