The "Flying Brick" is the insider tip among custom bike bases: affordable, four-cylinder performance (K75: three-cylinder), smooth-running, and with an unmistakable, industrial look. The K-custom scene is growing – but it's not yet overcrowded.
Long dismissed as "uncool," the K-models (K75, K100, K1100) are now one of the smartest choices for a unique custom build with performance and a small budget.
Why the K-model is a smart custom base
- More power: smoother-running four- or three-cylinder engine instead of a two-cylinder boxer.
- Affordable base: very attractive entry-level prices for good vehicles.
- Unique look: the industrial "Flying Brick" character sets you apart from the boxer mainstream.
⚠️ Important: The K-series has a longitudinally mounted engine and a different design than the boxer. K-custom parts are therefore not identical to boxer parts – make sure to choose the appropriate K-components.
K-model custom styles
K100 Café Racer
The classic: clean tail, clip-on handlebars, sporty lines – the four-cylinder makes it powerful.
K100 Streetfighter / Scrambler
Raw, uncompromising aesthetics or an off-road-capable custom – the K-base handles both.
K-model custom parts
You can find all custom parts, chassis, and engine components for the K75, K100, and K1100 gathered in our K-collection:
Other areas: K-model chassis tuning & service · K-models exhaust & engine.
📖 Reference: K-model custom parts with TÜV from Sport Evolution
Frequently asked questions about the K-model (FAQ)
Yes – affordable, powerful, and unique in its look. Ideal for anyone who wants to stand out from the boxer mainstream.
The K75 (three-cylinder) is slightly lighter and cheaper, the K100 (four-cylinder) has more power.
No – the K-series is its own world of parts. Use the appropriate K-components.
Still unsure? → Customizing a BMW – which model? · Boxer alternative: R80
Sport Evolution – your BMW custom workshop from Neuwied.
