Sanben WY 125 T-23 vs Gilera Runner

The Gilera Runner passes its MOT first time more often than the Sanben WY 125 T-23: 70.8% vs 57.3%, a 13.5-point lead.

MOT reliability, side by side

first-time pass rate, outright fail rate and tests analysed · 2005–2025

Metric	Sanben WY 125 T-23	Gilera Runner
First-time pass rate	57.3%	70.8%
Outright fail rate	36.1%	21.5%
Vs comparable bikes (age & mileage adjusted)	-15.8 pts	-0.7 pts
Engine size	125cc	124cc
Rank among all models	#5295 of 5428	#4675 of 5428
Median miles at test	7,532	11,381
MOT tests analysed	368	69,850
Most common failure	steering and suspension	lighting and signalling

First-time outcomes on normal tests, 2005–2025. "Most common failure" is the component group with the most recorded defects on failed tests. Read pass rates against test counts: a smaller sample is noisier. Source: DVSA anonymised MOT results.

"Vs comparable bikes" is the first-time pass rate minus the rate expected for each bike's own mix of age, mileage and test class, in percentage points: positive means better than comparable bikes. How this works.

Pass rate by test year

first-time MOT pass rate in each calendar year both bikes were tested

Test year	Sanben WY 125 T-23	Gilera Runner
2011	45.7%	67.6%
2012	64.1%	69.5%
2013	52.5%	69.5%
2014	70.2%	70.6%
2015	61.5%	72.1%

Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.

Pass rate by mileage

first-time MOT pass rate by miles on the clock at test

Mileage	Sanben WY 125 T-23	Gilera Runner
0k-10k miles	59.0%	76.2%
10k-20k miles	52.6%	67.5%

Bands with fewer than 30 tests for either bike are left out.

SANBEN WY 125 T-23 57.3% pass · 368 tests GILERA RUNNER 70.8% pass · 69.9k tests

See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.