SINNIS ZS 125-86 TERRAIN

125cc Petrol Class 1

#4673 of 5426 overall #5 of 16 SINNISs #349 of 734 commuter bikes

70.8%

first-time pass rate

21.3%

failed outright

7,930

median miles at test

2,152

MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2020–2025

The ZS 125-86 TERRAIN's first-time pass rate has fallen 15.4 points since 2020, 84.3% to 68.9%.

Pass rate by mileage

how the ZS 125-86 TERRAIN's first-time pass rate falls with the odometer · class average 73.4%

A low-mileage ZS 125-86 TERRAIN passes first time 75.6% of the time; by 20k that's 61.8%.

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 ZS 125-86 TERRAIN

failure defects by component group · advisories excluded

Component group	Defects	% of defects	vs all bikes
brakes	323	26.5	2.5×
structure and attachments	262	21.5	12.1×
lamps and reflectors	246	20.2	5.5×
suspension	159	13.1	7.9×
tyres	114	9.4	6.8×
steering	76	6.2	7.9×
audible warning (Horn)	19	1.6	4.8×
wheels	13	1.1	9.3×
Identification of the vehicle	5	0.4	1.0×

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 ZS 125-86 TERRAIN beats 0 of its 4 closest rivals (YAMAHA YBR 125, HONDA CG125, HONDA CBF125).

YAMAHA YBR 125 71.0% pass · 125k tests HONDA CG125 72.2% pass · 89.3k tests HONDA CBF125 73.3% pass · 84.4k tests GILERA RUNNER 70.8% pass · 69.9k 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 ZS 125-86 TERRAIN.

Pass rate by registration year

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

Best year to buy used: 2017 (73.6% pass). Weakest: 2019 (67.6%).

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.

SINNIS ZS 125-86 TERRAIN FAQ

answers computed from the data above · terms in the glossary

Is the SINNIS ZS 125-86 TERRAIN reliable?

The SINNIS ZS 125-86 TERRAIN is less reliable than average for its class: 70.8% of its 2,152 MOT tests (2005–2025) passed first time, against a class average of 73.4%. That ranks it #4673 of 5426 models.

What does a ZS 125-86 TERRAIN fail its MOT on most?

brakes — 27% of all defects recorded against failed ZS 125-86 TERRAIN tests.

What is the best year of ZS 125-86 TERRAIN to buy used?

By first-time pass rate, 2017-registered examples do best (73.6%) and 2019 worst (67.6%). Condition and history still trump the year.

How many miles will a ZS 125-86 TERRAIN last?

The median ZS 125-86 TERRAIN shows 7,930 miles at test, and examples around 20k miles still pass 61.8% of the time — mileage alone rarely kills one.