BIKERELIABILITY
MOT DATA · GREAT BRITAIN · 2005–2025
League table/ HARLEY-DAVIDSON/FLHRXS ROAD KING SP 1745 18
Model report · 2005–2025

HARLEY-DAVIDSON FLHRXS ROAD KING SP 1745 18

1745cc Petrol Class 2
95.3%
first-time pass rate
2.0%
failed outright
10,236
median miles at test
344
MOT tests, 2005–2025

Pass rate over time

first-time pass rate by test year · 2021–2025

The FLHRXS ROAD KING SP 1745 18's first-time pass rate has risen 1.8 points since 2021, 98.2% to 100.0%.

88%94%100%2021: 98.2% pass (55 tests)2022: 90.7% pass (75 tests)2023: 90.7% pass (75 tests)2024: 98.3% pass (59 tests)2025: 100.0% pass (69 tests)20212025

Pass rate by mileage

how the FLHRXS ROAD KING SP 1745 18's first-time pass rate falls with the odometer · class average 84.9%

A low-mileage FLHRXS ROAD KING SP 1745 18 passes first time 97.1% of the time; by 20k that's 83.9%.

81%91%100%0k: 97.1% pass (170 tests)10k: 96.1% pass (128 tests)20k: 83.9% pass (31 tests)0k10k20k

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 FLHRXS ROAD KING SP 1745 18

failure defects by component group · advisories excluded
Component group Share of defects Defects % of defects
lamps and reflectors
5 62.5
Identification of the vehicle
1 12.5
suspension
1 12.5
tyres
1 12.5

Defects recorded against failed normal tests, 2005–2025, grouped by DVSA inspection section. One test can record multiple defects.

How rivals compare

same type, similar capacity, high test volume

On first-time pass rate the FLHRXS ROAD KING SP 1745 18 beats 4 of its 4 closest rivals (HARLEY-DAVIDSON FLSTF, HARLEY-DAVIDSON FLSTC, HARLEY-DAVIDSON FXDWG).

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 FLHRXS ROAD KING SP 1745 18.

Pass rate by registration year

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

Best year to buy used: 2018 (96.9% pass). Weakest: 2017 (92.1%).

91%95%98%2017: 92.1% pass (89 tests)2018: 96.9% pass (192 tests)2019: 94.6% pass (56 tests)201720182019

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.