Sport · 2023

Yamaha YZF-R125 ergonomics: seat height, rider triangle & fit

The Yamaha YZF-R125 has a 32.5 in seat. Here’s how riders of different sizes fit, and what you can change.

Seat height: 32.5 in
Wet weight: 317 lb
Wheelbase: 53.3 in
Power: 11 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.

89Great fit

Specs: ManufacturerBars & pegs: Estimated

Single · 125 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

89/100

Great fit

Knee 59°

Within range

Comfort 52–85°

Hip 96°

Within range

Comfort 65–98°

Elbow 141°

Within range

Comfort 118–165°

Back lean 23°

Within range

Comfort 18–45°

Ground reach

0.5 in short of flat feet

Balls of both feet

Seat height with sag: 31.7 in
Leg length needed: 33.3 in
Your inseam + boots: 32.8 in

Wind

Clean air at your helmet, body sheltered

Suggested fixes

Boots with a thicker sole +0.4 in

Fit score 89 → 93

Find parts ↗
Lowering links -0.8 in

Fit score 89 → 92

Find parts ↗
Low seat or reshaped foam -0.6 in

Fit score 89 → 91

Find parts ↗

Lowering changes handling and side-stand lean; check with a specialist.

Compare

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 one foot flat, hips shifted.
Taller riders: at 6′4″, knee angle is about 54°; fit score 89/100.

Rider	Inseam	Fit	Ground reach	Knee	Lean
5′1″	28.1 in	63	Tiptoes on one foot	68°	29°
5′4″	29.5 in	73	One foot flat, hips shifted	65°	27°
5′7″	30.8 in	82	One foot flat, hips shifted	62°	25°
5′10″	32.2 in	91	Balls of both feet	59°	23°
6′1″	33.5 in	91	Both feet flat	56°	22°
6′4″	35 in	89	Both feet flat, knees bent	54°	20°

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	32.5 in	Manufacturer
Seat width at the front	—	Estimated
Handlebar grip	21.5 in ahead of the seat, 3.3 in above it	Estimated
Footpeg	1.0 in ahead of the seat, 15.6 in off the ground	Estimated
Wheelbase	53.3 in	Manufacturer
Wet weight	317 lb	Manufacturer
Rake	25°	Manufacturer
Trail	3.5 in	Manufacturer
Engine	Single · 125 cc	Manufacturer
Power	11 kW	Manufacturer
Tyres	100/80-17 / 140/70-17	Manufacturer
Category	Sport	Manufacturer