MOT cost .

Triumph

Bonneville T 100 (865)

1,089 MOT tests analysed. sits above the UK fleet average — here's where Bonneville T 100 (865)s pass, fail, and end up on the retest sheet.

That's 14.4 points above the UK fleet average across our 1,988 tracked models — a confident result.

Pass

90.2%

Pass-after-fix

4.5%

Fail

5.2%

Avg miles

13,965

Pass + Pass-after-fix + Fail = 100%

The picture

Bonneville T 100 (865): a strong MOT record by UK norms

Across 1,089 MOT tests, the Bonneville T 100 (865) returns 90.2% first-time pass — comfortably ahead of the UK fleet average. The single most-logged Major fail is brake pads worn below 1.0 mm. Uneven braking force and tyre tread under the limit round out the top three. Average tested mileage sits at 13,965, which is the lens to read those failure rankings through. If you own one and the next test is close, the ranked list below is a sensible pre-test checklist.

Top ten reasons for rejection.

  1. 01

    Brake lining or pad worn below 1.0mm

    9 occurrences · 0.8% of tests

  2. 02

    Excessive fluctuation in brake effort through each wheel revolution

    9 occurrences · 0.8% of tests

  3. 03

    Tyre tread depth not in accordance with the requirements

    7 occurrences · 0.6% of tests

  4. 04

    A stop lamp(s) does not illuminate by the operation of both brake controls or remains on when the brakes are released

    6 occurrences · 0.6% of tests

  5. 05

    Significant brake effort recorded with no brake applied indicating a binding brake

    5 occurrences · 0.5% of tests

  6. 06

    Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning

    5 occurrences · 0.5% of tests

  7. 07

    A shock absorber not functioning or leaking severely

    4 occurrences · 0.4% of tests

  8. 08

    A footrest missing or insecure

    4 occurrences · 0.4% of tests

  9. 09

    A lamp missing or inoperative

    3 occurrences · 0.3% of tests

  10. 10

    A transmission belt, chain, sprocket or pulley excessively loose or worn

    3 occurrences · 0.3% of tests

Counts cover Major and Dangerous defects logged at test. Advisory items excluded so this shows why a car was rejected, not just what the tester flagged in passing.

Worst-case fix budget · top 3 failures

£148–£290

If every one of this Bonneville T 100 (865)'s most-logged Major fails hit at the same MOT, that's the real-world UK garage range. Reality is usually one or two items, not all of them. Open the estimator →

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Tools that pre-empt a retest.

Picked against this car's top failure patterns. Affiliate links to Amazon UK — we earn a small cut at no cost to you. Disclosed up-front, doesn't shape the data.

Item 01 · Amazon UK

Brake pad measurement gauge

Testers fail pads under 1.5mm. A wear gauge tells you if you've got two months left or two weeks.

Search Amazon UK

Item 02 · Amazon UK

Digital tyre-tread depth gauge

Five quid for a gauge beats £150 for a retest. UK MOT minimum is 1.6mm — most testers fail anything below 2mm to be safe.

Search Amazon UK

Item 03 · Amazon UK

H7 / W21W bulb pack

A spare-bulb kit lives in the boot. Test morning is not the time to find your stop-lamp's gone.

Search Amazon UK

Buying or keeping a Bonneville T 100 (865)?

Use the failure ranking as a pre-test checklist or a haggling lever. Treat the headline pass rate as a fleet-wide trend, not a guarantee on any individual car.

If you own a Bonneville T 100 (865) and your last MOT looked nothing like the ranked failures above, that's normal — individual cars vary widely. The ranking shows the patterns testers flag most often across the country.