Data as of: DVSA MOT results to 2025
TGB 304 vs Gilera Runner
The Gilera Runner passes its MOT first time more often than the TGB 304: 70.8% vs 70.2%, a 0.6-point lead.
MOT reliability, side by side
| Metric | TGB 304 | Gilera Runner |
|---|---|---|
| First-time pass rate | 70.2% | 70.8% |
| Outright fail rate | 20.0% | 21.5% |
| Vs comparable bikes (age & mileage adjusted) | -0.2 pts | -0.7 pts |
| Engine size | 124cc | 124cc |
| Rank among all models | #4717 of 5428 | #4675 of 5428 |
| Median miles at test | 11,781 | 11,381 |
| MOT tests analysed | 1,243 | 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.
What fails, side by side
| Component | TGB 304 | Gilera Runner |
|---|---|---|
| Lights & signalling | 7.7% | 12.3% |
| Steering & suspension | 8.7% | 10.6% |
| Brakes | 7.6% | 7.2% |
| Tyres & wheels | 5.6% | 5.1% |
| Fuel & exhaust | 2.1% | 2.6% |
| Structure & body | 1.4% | 2.0% |
A test that fails on two components counts once in each. Component links go to the bikes most likely to fail on it.
Pass rate by test year
| Test year | TGB 304 | Gilera Runner |
|---|---|---|
| 2010 | 73.6% | 67.9% |
| 2011 | 75.2% | 67.6% |
| 2012 | 74.2% | 69.5% |
| 2013 | 68.6% | 69.5% |
| 2014 | 63.4% | 70.6% |
| 2015 | 70.0% | 72.1% |
| 2016 | 67.7% | 73.3% |
| 2017 | 68.9% | 76.1% |
Each year mixes bikes of different ages, so a fleet that is getting older tends to slip.
Pass rate by mileage
| Mileage | TGB 304 | Gilera Runner |
|---|---|---|
| 0k-10k miles | 75.0% | 76.2% |
| 10k-20k miles | 67.7% | 67.5% |
| 20k-30k miles | 65.7% | 65.4% |
Bands with fewer than 30 tests for either bike are left out.
TGB 304 vs Gilera Runner FAQ
Which is more reliable, the TGB 304 or the Gilera Runner?
The Gilera Runner passes its MOT first time more often than the TGB 304: 70.8% vs 70.2%, a 0.6-point lead. Adjusted for age, mileage and test class the two are level (-0.2 vs -0.7 points against comparable bikes), so the raw gap is mostly down to how old and how used each fleet is. An MOT checks roadworthiness items, not engine or gearbox internals.
What does the TGB 304 fail its MOT on most?
Steering & suspension: 8.7% of TGB 304 MOT tests failed on it, then lights & signalling (7.7%).
What does the Gilera Runner fail its MOT on most?
Lights & signalling: 12.3% of Gilera Runner MOT tests failed on it, then steering & suspension (10.6%).
Which holds up better at high mileage, the TGB 304 or the Gilera Runner?
They are level: at 20k-30k miles the TGB 304 passes 65.7% first time and the Gilera Runner 65.4%.
See each bike's full report (trend, mileage curve, failure breakdown and rivals) on its own page.