TRIUMPH SPEED FOUR

599cc Petrol Class 2

#3291 of 5426 overall #164 of 175 TRIUMPHs #2095 of 2787 other bikes

81.4%

first-time pass rate

11.3%

failed outright

14,114

median miles at test

8,421

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2006–2025

The SPEED FOUR's first-time pass rate has fallen 2.1 points since 2006, 87.7% to 85.6%.

Pass rate by mileage

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

A low-mileage SPEED FOUR passes first time 87.3% of the time; by 50k that's 80.0%.

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 SPEED FOUR

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
lighting and signalling	434	23.8	0.9×
brakes	428	23.5	0.9×
steering and suspension	274	15	0.9×
lamps and reflectors	185	10.1	0.9×
tyres and wheels	169	9.3	0.9×
drive system	98	5.4	1.4×
structure and attachments	80	4.4	1.1×
suspension	76	4.2	1.1×
body and structure	45	2.5	1.0×
tyres	36	2	0.6×

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 SPEED FOUR beats 3 of its 4 closest rivals (KAWASAKI ZX-6R, SUZUKI GSF600, YAMAHA FZS600).

KAWASAKI ZX-6R 78.1% pass · 174k tests SUZUKI GSF600 77.3% pass · 143k tests YAMAHA FZS600 82.6% pass · 137k tests SUZUKI SV650S 80.6% pass · 84.6k tests

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 SPEED FOUR.

Pass rate by registration year

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

Best year to buy used: 2007 (86.2% pass). Weakest: 2002 (80.2%).

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 SPEED FOUR FAQ

answers computed from the data above · terms in the glossary

Is the TRIUMPH SPEED FOUR reliable?

The TRIUMPH SPEED FOUR is less reliable than average for its class: 81.4% of its 8,421 MOT tests (2005–2025) passed first time, against a class average of 84.9%. That ranks it #3291 of 5426 models.

What does a SPEED FOUR fail its MOT on most?

lighting and signalling — 24% of all defects recorded against failed SPEED FOUR tests.

What is the best year of SPEED FOUR to buy used?

By first-time pass rate, 2007-registered examples do best (86.2%) and 2002 worst (80.2%). Condition and history still trump the year.

How many miles will a SPEED FOUR last?

The median SPEED FOUR shows 14,114 miles at test, and examples around 50k miles still pass 80.0% of the time — mileage alone rarely kills one.