BIKERELIABILITY Reg check
League table/ TRIUMPH/T150
Model report · 2005–2025

Data as of: DVSA MOT results to 2025

TRIUMPH T150

750cc Petrol Class 2
#1332 of 5428 overall #94 of 175 TRIUMPHs #816 of 2788 other bikes
88.8%
first-time pass rate
3.4%
failed outright
19,775
median miles at test
821
MOT tests, 2005–2025
+3.2pp
vs expected · age & mileage

The pass rate is the MOT first-time pass: a roadworthiness check of the items an MOT covers (brakes, lights, tyres, steering, structure, emissions), not a full mechanical inspection of engine or gearbox internals. It is a reliability signal, not a complete measure of mechanical reliability. What this measures.

“vs expected” adjusts for age, mileage and test class, so a cherished classic and a hard-used commuter are compared fairly. How this works.

Pass rate over time

first-time pass rate by test year · 2006–2017

The T150's first-time pass rate has held steady since 2006 (88.1% → 87.3%).

78%87%96%2006: 88.1% pass (59 tests)2007: 91.2% pass (57 tests)2008: 85.7% pass (56 tests)2009: 81.1% pass (53 tests)2010: 93.2% pass (59 tests)2011: 92.6% pass (68 tests)2012: 86.2% pass (58 tests)2013: 85.9% pass (78 tests)2014: 89.3% pass (75 tests)2015: 86.3% pass (80 tests)2016: 93.2% pass (59 tests)2017: 87.3% pass (55 tests)20062017

Pass rate by mileage

how the T150's first-time pass rate falls with the odometer · class average 84.9%

A low-mileage T150 passes first time 91.8% of the time; by 30k that's 90.0%.

87%90%93%0k: 91.8% pass (170 tests)10k: 88.8% pass (240 tests)20k: 87.5% pass (192 tests)30k: 90.0% pass (110 tests)0k20k30k

First-time pass rate by odometer reading at test, 10,000-mile bands for this model. Mileage is the strongest reliability signal. See the full curve.

What fails on a T150

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects vs all bikes
lighting and signalling
15 31.2 0.3×
steering and suspension
13 27.1 0.4×
brakes
11 22.9 0.3×
tyres and wheels
5 10.4 0.2×
fuel and exhaust
2 4.2 0.3×
body and structure
1 2.1 0.3×
driving controls
1 2.1 0.5×

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects. "vs all bikes" is how often this model's tests record a defect in the group, as a multiple of the all-bike rate.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the T150 beats 4 of its 4 closest rivals (KAWASAKI ZX-6R, SUZUKI GSF600, YAMAHA FZS600).

KAWASAKI ZX-6R 78.1% pass · 174k tests Compare head-to-head →
SUZUKI GSF600 77.3% pass · 143k tests Compare head-to-head →
YAMAHA FZS600 82.6% pass · 137k tests Compare head-to-head →
TRIUMPH SPRINT 85.6% pass · 133k tests Compare head-to-head →

Rivals share this bike's type and sit within ±30% of its engine capacity, ≥ 5,000 tests. Card colour = better/worse first-time pass rate than the T150.

Compare with any bike

rival not listed above? pick any model to see it head-to-head with the T150

More TRIUMPH models

other TRIUMPH bikes ranked by MOT pass rate
TRIUMPH BONNEVILLE 89.0% pass · 195k tests
TRIUMPH TIGER 89.6% pass · 161k tests
TRIUMPH SPRINT 85.6% pass · 133k tests
TRIUMPH DAYTONA 83.6% pass · 113k tests
TRIUMPH SPEED TRIPLE 85.6% pass · 74.6k tests
TRIUMPH THUNDERBIRD 87.8% pass · 56.3k tests

See all TRIUMPH models →

Pass rate by registration year

how each model-year cohort fares · registration year from first use date

Highest pass rate: 1969 (94.5%). Lowest: 1972 (86.5%). Every T150 year compared →

85%91%96%1969: 94.5% pass (55 tests)1971: 90.8% pass (195 tests)1972: 86.5% pass (104 tests)1973: 91.0% pass (133 tests)1974: 88.9% pass (99 tests)1975: 87.9% pass (140 tests)196919731975

First-time pass rate by the year each bike was first registered (cohorts with ≥ 50 tests). Older cohorts are survivors: the worst examples have already left the road, which tends to lift the earliest years.

TRIUMPH T150 FAQ

answers computed from the data above · terms in the glossary

Is the TRIUMPH T150 reliable?

The TRIUMPH T150 is more reliable than average for its class: 88.8% of its 821 MOT tests (2005–2025) passed first time, against a class average of 84.9%. That ranks it #1332 of 5428 models.

What does a T150 fail its MOT on most?

lighting and signalling: 31% of all defects recorded against failed T150 tests.

What is the best year of T150 to buy used?

By first-time pass rate, 1969-registered examples do best (94.5%) and 1972 worst (86.5%). Condition and history still trump the year.

How many miles will a T150 last?

The median T150 shows 19,775 miles at test, and examples around 30k miles still pass 90.0% of the time, so mileage alone rarely decides the result.

Embed this bike

Free to embed on your site, blog or forum: a live Triumph T150 reliability card that stays up to date and links back here. More on the free API page.