Should I check the MOT history before buying a 2021 Triumph Bonneville Street Twin?

Yes. Look for recurring advisories — slow-building issues like corrosion or brake wear patterns show up years before they become failures. A full MOT history analysis will highlight patterns that a single test result won't reveal.

What corrosion should I look for when inspecting a 2021 Triumph Bonneville Street Twin?

Check brake pipes, sills, subframes, and chassis legs. Surface rust is normal at this age; structural rust is a serious problem that is expensive to fix and can fail an MOT.

How are tyres and brakes typically on a 2021 Triumph Bonneville Street Twin?

Tyres and brakes are the most common advisory items on vehicles of this age. Budget for replacement if they are near the limit, and factor this into your offer price.

Is the 2021 Triumph Bonneville Street Twin reliable?

Based on MOT data from 213 vehicles, the 2021 Triumph Bonneville Street Twin has a first-time MOT pass rate of 96.2%, indicating generally reliable for its class. Always check the full MOT history of any specific vehicle before buying.

Do I need an HPI check when buying a 2021 Triumph Bonneville Street Twin?

Yes. The MOT history will not show outstanding finance, insurance write-offs, or stolen status. An HPI check covers these areas and should be part of any used car purchase.

CarHunch

Get Started

Triumph Bonneville Street Twin (2021)

213 real MOT outcomes analysed • 96.2% first-time pass rate

2021 Triumph Bonneville Street Twin

CarHunch analysed 213 real MOT records for the 2021 Triumph Bonneville Street Twin. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
Which year to buy? →

On this page

AI Analysis Reliability Overview Check a Specific Reg Buyer's Checklist Pass Rate by Fuel Mileage Distribution MOT Averages Colour Breakdown Compare Models

The 2021 Triumph Bonneville Street Twin is a genuinely reliable machine, with a 92.6% first-time pass rate that sits well above the UK average of 80%—and dangerous defects are rare, affecting just 2.4% of the fleet. This is a motorcycle that's built to last, so long as you're buying one in decent condition.

These bikes are running light at under 5,600 miles on average despite being three years old, which means you're likely to find one that's been properly maintained rather than thrashed. With only 0.11 failures per vehicle and just 0.4 advisories, the Bonneville Street Twin demands minimal remedial work—so when you're viewing one, focus your inspection on age-related wear and service history rather than structural problems.

We have limited data for the 2021 Triumph Bonneville Street Twin — treat the figures below as indicative rather than definitive.

First-time pass

96.2%

UK average ~80%

Better than average

Dangerous (ever)

2.4%

At least once in MOT history

Check this vehicle

Avg failures / car

0.11

Over 1.9 tests on record

Low

Typical mileage

Middle half: 3k–8k

For context

These stats describe 213 vehicles as a group. The specific vehicle you're looking at could be the one good example or the one outlier. Run its registration to find out.

A solid choice — agree?

See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 213 Triumph Bonneville Street Twin cars.

Before you buy a 2021 Triumph Bonneville Street Twin

Based on MOT data from 213 vehicles — here's what to check.

📋 Check the full MOT history. 2.4% of these vehicles have had a dangerous defect recorded - recurring advisories often signal problems years before they become failures.
Search the reg on CarHunch for the full MOT history, reliability stats and a free AI-powered analysis of that exact vehicle.
🔍 Brake pipes, sills and subframes are the key areas on a vehicle this age — structural rust is hard to spot without getting underneath. A mechanic will check all of this before you commit, and give you a concrete basis to negotiate on price. Inspection →
📄 Outstanding finance, insurance write-offs and clocking won't appear in the MOT records — a dedicated history check covers all of this. Our link gets you 20% off automatically. History Get 20% off via CarHunch

Pass Rate by Fuel Type

Fuel type	Vehicles	Pass rate	Avg failures
Petrol (98%)	209	96.1%	0.11

Colour Breakdown

Based on 722 Triumph Bonneville Street Twin vehicles registered in the UK — across all years. From DVLA registration records.

Blue 26.3%

190

Black 21.9%

158

Gold 18.3%

132

Silver 18%

130

Red 6.2%

Grey 6%

White 1.7%

Bronze 1.7%

Mileage Distribution

Most 2021 Triumph Bonneville Street Twin vehicles sit in the blue band. If the vehicle you're looking at is outside it, it's either unusually low or high mileage for its age.

4,759

typical

2,686

low mileage

7,738

high mileage

Half of all 2021 Triumph Bonneville Street Twin vehicles fall between 2,686 and 7,738 miles.

Is the mileage you're seeing normal?

✓ Under 2,686 miles — lower than most. Could be great, or could be a vehicle that rarely moved. Check test frequency and mileage progression in the MOT history.

✓ 2,686–7,738 miles — normal for age. This is where most 2021 Triumph Bonneville Street Twins sit.

⚠ Over 10,446 miles — higher than typical. Not necessarily a problem, but check service history and look out for advisory build-up on tyres and brakes.

MOT History Averages

1.9

Avg MOT tests per vehicle

0.11

Avg failures per vehicle

0.4

Avg advisories per vehicle

Other model years — Triumph Bonneville Street Twin: All Bonneville Street Twin years → Which year to buy? →

2022

Or browse all models: Triumph →

Compare with another model

See how the 2021 Triumph Bonneville Street Twin stacks up against a rival.

A solid choice — agree?