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

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 Bobber?

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 Bobber?

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 Bobber reliable?

Based on MOT data from 229 vehicles, the 2021 Triumph Bonneville Bobber has a first-time MOT pass rate of 93.1%, 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 Bobber?

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.

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Triumph Bonneville Bobber (2021)

229 real MOT outcomes analysed • 93.1% first-time pass rate

2021 Triumph Bonneville Bobber

CarHunch analysed 229 real MOT records for the 2021 Triumph Bonneville Bobber. Real test outcomes — pass rates, defect profiles, mileage data — from verified DVLA records. Updated as new MOTs are recorded.
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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 Bobber passes its MOT at 84.2%, which is a solid 4.2 percentage points above the UK average—suggesting this bike is genuinely reliable out of the box. Dangerous defects are rare at just 1.8%, so safety concerns are minimal for potential buyers.

At just 3,490 miles median mileage, these bikes are still relatively young and barely run-in, which explains the low failure rate of 0.16 per vehicle. The 0.4 advisories per bike indicate minor wear items rather than serious issues, so focus your pre-purchase inspection on service history and whether the previous owner actually used the warranty rather than worrying about lurking defects.

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

First-time pass

93.1%

UK average ~80%

Better than average

Dangerous (ever)

1.8%

At least once in MOT history

Check this vehicle

Avg failures / car

0.16

Over 1.8 tests on record

Low

Typical mileage

Middle half: 2k–5k

For context

These stats describe 229 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.

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See this vehicle's full MOT history & AI hunches

Spot recurring advisories, hidden issues, and how it compares to 229 Triumph Bonneville Bobber cars.

Before you buy a 2021 Triumph Bonneville Bobber

Based on MOT data from 229 vehicles — here's what to check.

📋 Check the full MOT history. 1.8% 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 (99%)	227	93.1%	0.16

Colour Breakdown

Based on 1,282 Triumph Bonneville Bobber vehicles registered in the UK — across all years. From DVLA registration records.

Black 41.4%

531

Red 27.4%

351

Grey 22%

282

Purple 5.5%

Green 2.3%

Gold 0.8%

Blue 0.5%

Mileage Distribution

Most 2021 Triumph Bonneville Bobber 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.

3,490

typical

1,794

low mileage

5,349

high mileage

Half of all 2021 Triumph Bonneville Bobber vehicles fall between 1,794 and 5,349 miles.

Is the mileage you're seeing normal?

✓ Under 1,794 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.

✓ 1,794–5,349 miles — normal for age. This is where most 2021 Triumph Bonneville Bobbers sit.

⚠ Over 7,221 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

1.8

Avg MOT tests per vehicle

0.16

Avg failures per vehicle

0.4

Avg advisories per vehicle

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

2022 2023 2024 2025

Or browse all models: Triumph →

Compare with another model

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

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