Buell XB12S vs BMW R1150

The BMW R1150 passes its MOT first time more often than the Buell XB12S: 88.5% vs 86.2%, a 2.3-point lead.

MOT reliability, side by side

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

Metric	Buell XB12S	BMW R1150
First-time pass rate	86.2%	88.5%
Outright fail rate	6.7%	6.8%
Vs comparable bikes (age & mileage adjusted)	-0.9 pts	+6.7 pts
Engine size	1,203cc	1,130cc
Rank among all models	#2148 of 5428	#1449 of 5428
Median miles at test	8,538	33,151
MOT tests analysed	5,087	170,963
Most common failure	lighting and signalling	brakes

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

share of each bike's MOT tests that failed on the component · lower is better

Component	Buell XB12S	BMW R1150
Lights & signalling	3.7%	2.4%
Brakes	1.1%	2.9%
Steering & suspension	1.5%	1.4%
Tyres & wheels	1.2%	1.7%
Structure & body	0.8%	0.2%
Fuel & exhaust	0.4%	0.1%
Drive system	0.1%	0.0%

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

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

Test year	Buell XB12S	BMW R1150
2018	91.9%	88.1%
2019	88.3%	88.3%
2020	87.5%	88.0%
2021	89.6%	87.9%
2022	89.6%	88.6%
2023	87.4%	89.1%
2024	90.5%	88.1%
2025	90.6%	89.1%

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	Buell XB12S	BMW R1150
0k-10k miles	87.9%	92.9%
10k-20k miles	84.2%	92.1%
20k-30k miles	84.8%	90.1%
30k-40k miles	78.5%	88.6%

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

Buell XB12S vs BMW R1150 FAQ

answers computed from the data above · terms in the glossary

Which is more reliable, the Buell XB12S or the BMW R1150?

The BMW R1150 passes its MOT first time more often than the Buell XB12S: 88.5% vs 86.2%, a 2.3-point lead. Adjusted for age, mileage and test class, the BMW R1150 still comes out ahead: -0.9 points vs comparable bikes for the Buell XB12S, +6.7 for the BMW R1150. An MOT checks roadworthiness items, not engine or gearbox internals.

What does the Buell XB12S fail its MOT on most?

Lights & signalling: 3.7% of Buell XB12S MOT tests failed on it, then steering & suspension (1.5%).

What does the BMW R1150 fail its MOT on most?

Brakes: 2.9% of BMW R1150 MOT tests failed on it, then lights & signalling (2.4%).

Which holds up better at high mileage, the Buell XB12S or the BMW R1150?

At 30k-40k miles the BMW R1150 passes first time more often: 78.5% for the Buell XB12S vs 88.6% for the BMW R1150.

BUELL XB12S 86.2% pass · 5,087 tests BMW R1150 88.5% pass · 171k tests

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