Cruiser · 2024

BMW R 18 ergonomics: seat height, rider triangle & fit

The BMW R 18 has a 27.2 in seat. Here’s how riders of different sizes fit, and what you can change.

Seat height: 27.2 in
Wet weight: 761 lb
Wheelbase: 68.1 in
Power: 67 kW

Specs: ManufacturerBars & pegs: EstimatedSeat width: Estimated

Try it with your measurements

Units

Your measurements

Height (in)

Inseam (in)

Arm length

Seated shoulder height

Boot sole

Preferred posture

Motorcycle

Modifications

Try common parts and see how they change your fit. The picture shows your setup over the stock bike.

Seat

Seat height0

Thicker or thinner seat. Lower makes it easier to reach the ground.

Lowering kit0

Lowers the whole bike. Easier to reach the ground, a little less legroom.

Handlebar

Bar risers0

Raises the bars. You sit more upright with less weight on your wrists.

Bar pullback0

Brings the bars closer to you. Shorter reach, good for shorter arms.

Footpegs

Lower pegs0

Lowers the footpegs. More knee room, less cramped legs.

Move pegs back0

Moves the pegs back (or forward). Further back feels sportier.

Windscreen

Windscreen height0

Taller or shorter screen. Changes how much wind hits your chest and helmet.

83Good fit

Specs: ManufacturerBars & pegs: Estimated

Boxer twin · 1802 cc · Hold W or Space to accelerate, ↑ / ↓ to change gear · Synthesised from the engine layout and firing order. Not a recording.

Original illustration, motorcycleergonomics.com

Fit score

83/100

Good fit

Knee 75°

Within range

Comfort 72–120°

Hip 79°

Tighter than comfortable

Comfort 85–130°

Elbow 150°

Within range

Comfort 125–176°

Back lean 5°

Within range

Comfort -12–10°

Ground reach

4.4 in to spare

Both feet flat, knees bent

Seat height with sag: 26.5 in
Leg length needed: 28.3 in
Your inseam + boots: 32.8 in

Wind

Full wind on chest and helmet

Suggested fixes

Handlebar risers +0.8 in

Fit score 83 → 86

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Estimate. Handlebar and peg positions for this bike are estimated. Always sit on a bike before you buy it.

Fit by rider size

Shorter riders: at 5′4″ with a 29.5 in inseam, expect both feet flat, knees bent.
Taller riders: at 6′4″, knee angle is about 68°; fit score 73/100.

Rider	Inseam	Fit	Ground reach	Knee	Lean
5′1″	28.1 in	82	Both feet flat	88°	11°
5′4″	29.5 in	83	Both feet flat, knees bent	83°	9°
5′7″	30.8 in	83	Both feet flat, knees bent	79°	7°
5′10″	32.2 in	82	Both feet flat, knees bent	75°	5°
6′1″	33.5 in	80	Both feet flat, knees bent	71°	4°
6′4″	35 in	73	Both feet flat, knees bent	68°	2°

Reference riders with average proportions and 20 mm boot soles. Your proportions may differ.

Spec sheet

Drawn to scale from this bike's geometry.

Geometry & specifications

Geometry & specifications	Value	Source
Seat height	27.2 in	Manufacturer
Seat width at the front	12.6 in	Estimated
Handlebar grip	20.5 in ahead of the seat, 10.6 in above it	Estimated
Footpeg	15.0 in ahead of the seat, 11.8 in off the ground	Estimated
Wheelbase	68.1 in	Manufacturer
Wet weight	761 lb	Manufacturer
Rake	32.7°	Manufacturer
Trail	5.9 in	Manufacturer
Engine	Boxer twin · 1802 cc	Manufacturer
Power	67 kW	Manufacturer
Tyres	120/70-19 / 180/65-16	Manufacturer
Category	Cruiser	Manufacturer