Tall riders get burned. You research a bike for weeks, show up at the dealer, sit on it — and your knees are jammed into the tank. MotoTriangle calculates your ergonomic fit before you make the trip.
370
Bikes in DB
5
Fit dimensions
Free
Always open
01
Measure yourself
Inseam, torso, arm length, shoulder width. Takes 5 minutes with a tape measure.
02
Pick a bike
Search our database of motorcycle geometry. New models added continuously.
03
Get your score
Knee angle, back lean, arm reach — each scored and explained in plain language.
04
Book with confidence
Walk into the dealer knowing exactly how the bike will feel before you sit on it.
Your measurements
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cm
cm
cm
cm
Select a bike
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Enter your measurements and select a bike to calculate your ergonomic fit score.
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Fit Score
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⚠ Partial data — the manufacturer does not publish handlebar and footpeg positions for this bike, so the score is based on the dimensions that could be calculated (usually seat height alone). Measured this bike? Help fill the gap →
Bike geometry used
Bike Database
370 motorcycles · geometry data · curated from manufacturer specs
Stand barefoot against a wall. Place a book between your legs at crotch height, spine against wall. Measure from the top of the book to the floor.
02
Torso length
Sit upright on a hard chair. Measure from the seat surface to the top of your shoulder (acromion bone).
03
Arm length
Arm relaxed at your side. Measure from shoulder (acromion) to wrist bone (ulnar styloid).
04
Shoulder width
Measure across your back from acromion to acromion (the bony tips of both shoulders).
Tip for tall riders: Inseam is the single most important measurement for seat height compatibility. If your inseam is 90 cm+, filter for bikes with seat height ≥ 840 mm or you risk over-compressed knees.
Questions
Frequently asked
What is the rider triangle?
The rider triangle is the shape formed by the three points where you touch the motorcycle: the handlebar grips, the seat and the footpegs. Its proportions decide your knee bend, how far you lean forward and how much your arms reach. Two bikes with the same seat height can feel completely different if their bars and pegs sit in different places.
How does MotoTriangle score the fit?
It combines your inseam, torso, arm length and shoulder width with the bike's geometry and scores up to five dimensions: ground reach (seat height against your inseam, from flat-footed to tiptoes), knee bend (28–55° is comfortable), forward back lean (25° or less is relaxed and upright), elbow bend at the bars (15–35° is relaxed), and handlebar width against your shoulders. The fit score is the average of the dimensions that the bike's published data allows us to calculate.
Why do some bikes show partial data?
Many manufacturers publish seat height and wheelbase but not handlebar or footpeg positions. When those are missing, MotoTriangle can only score the dimensions the data supports and marks the result as partial. You can help by sending measurements taken from a real bike.
What seat height suits my inseam?
Inseam is the single most important measurement. As a rule of thumb, riders with an inseam of 90 cm or more are more comfortable on bikes with a seat height of 840 mm or higher; a lower seat usually over-compresses the knees. Shorter riders should look at the knee angle result as well as seat height, because a narrow seat can be easier to flat-foot than a wide one of the same height.
Is MotoTriangle free?
Yes. The calculator and the bike database are free to use, with no account and no tracking, and the geometry data is published under CC BY.
Contribute
Measure a bike, fill the gaps
Manufacturers publish seat height, but almost never where the handlebars and footpegs sit.
Those two points decide your knee bend, back lean and arm reach, and they are what the database is missing.
With a tape measure, a piece of string and about 20 minutes, you can measure a bike properly and help every rider who looks at it after you.
A plumb line: any string with a key or a nut tied to the end
A straight edge: a long ruler, spirit level or plank
Masking tape and a pen
Optional: a helper, and your phone for a photo
Set the bike up
Level ground: a garage floor, not a sloping drive
Bike upright, not leaning on the side stand: centre stand, paddock stand, or a helper holding it vertical
Front wheel pointing straight ahead
Nobody sitting on it, tyres at normal pressure, suspension at its usual setting
Step by step
1
Find the seat point
Sit on the bike the way you normally ride, then get off. The seat point is the lowest point of the seat where you were sitting, usually about a hand's width behind the tank. Stick a strip of masking tape across the seat there. Every horizontal measurement starts from this point, so take your time finding it.
A
Seat height
Lay the straight edge across the seat, side to side, on the tape. Measure straight down from the underside of the straight edge to the ground. Your figure may differ a little from the brochure; we want what the bike really measures.
B
Handlebar height
Find the grip centre, the middle of the rubber grip where your palm sits. Use the left (clutch-side) grip. Measure vertically from the grip centre to the ground.
C
Handlebar reach
Hold the plumb line against the grip centre and let the weight settle just above the floor. Mark the floor under it with a tape cross. Do the same from the seat point. Measure between the two floor marks along the length of the bike, not diagonally. The plumb line turns an awkward 3D measurement into a flat one on the floor.
D
Handlebar width
With the front wheel straight, measure across the bike between the inner ends of the two grips, where your index fingers rest. This is the width your hands actually hold, so we compare it with your shoulders.
E
Footpeg height
Use the left footpeg. Measure from the top of the peg, at its centre, straight down to the ground.
F
Footpeg setback
Drop the plumb line from the centre of the footpeg and mark the floor. Measure between this mark and the seat-point mark, along the length of the bike. Note whether the peg is in front of or behind the seat point; on most bikes it is in front.
Measure twice. If two readings differ by more than 5 mm, take a third and send the middle one.
Non-stock parts change everything: if the bike has aftermarket bars, risers, a lowered or comfort seat, rearsets or
lowered suspension, measure it as it is and tell us what has been changed.
Send us your numbers
Nothing is sent from this page. The button opens your email app with everything filled in, so you can check it,
attach a side-on photo if you have one, and press send. Measurements you contribute are published under
CC BY, like the rest of the data.
What's new
Changelog
Every brand and model addition, plus notable changes to the calculator. Newest first.
2026-09-26
added
Contribute: measure a bike and send us the numbers
A new Contribute page explains,
step by step and with a labelled drawing, how to measure the six points of
a bike's rider triangle with a tape measure and a plumb line.
A short form turns your numbers into a ready-to-send email. Nothing is stored
on the site.
Handlebar and footpeg positions are what the database lacks most; every bike
measured this way unlocks the knee, back and arm scores for it.
2026-09-26
fixed
Every bike now gets a fit score, and the menu works on phones
New ground reach dimension: your inseam against the seat height,
from flat-footed to tiptoes. Seat height is published for almost every bike,
so the calculator now returns a score even when handlebar and footpeg
positions are missing. Before this, most bikes showed no score at all.
On screens narrower than 900px the menu used to disappear, so the Bike DB,
Measure and Changelog pages could not be reached. It now sits in its own
swipeable row under the logo.
The how-it-works steps, the geometry breakdown and the bike table now fit
small screens instead of squeezing four columns side by side.
New FAQ on the Measure page: what the rider triangle is, how the score is
worked out, and why some bikes show partial data.
2026-07-26
data
Six more brands — the database now holds 370 bikes
Harley-Davidson (23), Husqvarna (44), Kawasaki (54), Triumph (19),
CFMOTO (16) and Royal Enfield (6) added from the manufacturers'
own European sites.
Kawasaki, Triumph and Harley-Davidson arrive complete with seat height,
wheelbase, rake and trail; Husqvarna also brings suspension travel.
CFMOTO publishes seat height only, and Royal Enfield's pages carry
different fields per model, so those two are partial.
2026-07-26
changed
Rake and trail filled in for the Honda range
The French brochures never print caster angle or trail. Those two columns
now come from the honda.co.uk specification pages, applied only where the
seat height confirms it is the same model year.
2026-07-26
data
Database expanded to 208 bikes across six brands
Every model re-imported from the manufacturers' own European sources:
Honda France brochures, yamaha-motor.eu spec sheets, ktm.com technical
specification sheets, Suzuki GB brochures, ducati.com and the BMW Group
PressClub media kits.
Honda 47, KTM 64, Yamaha 29, Suzuki 24, Ducati 21, BMW 20 models
(plus the three KTM-built Brabus editions).
New categories in the filters: motocross and mini.
2026-07-26
data
BMW line-up imported
Added the R 1300, S 1000 / M 1000, F 900 / F 800 / F 450, R 12 and R 18 families.
Figures come from BMW's own press kits, which publish the same technical data as
the model pages.
2026-07-26
data
Ducati line-up imported
Added the Multistrada, Panigale, Streetfighter, Monster, Diavel, Hypermotard,
DesertX and Desmo off-road ranges with seat height, wheelbase, rake and trail.
Ducati does not publish suspension travel, so those columns stay empty.
2026-07-26
data
Suzuki line-up imported
Added the V-Strom, GSX-8, GSX-S, GSX-R, Hayabusa, Katana, DR-Z4 and Burgman
ranges from the 2026 brochures. Seat height is published for the whole range;
wheelbase only appears on individual model sheets.
2026-05-24
launch
Site launch
Initial public release of MotoTriangle.
Ergonomic fit calculator covering knee, back lean, arm reach and shoulder width.
Brand database seeded from manufacturer technical specifications.
2026-05-24
data
KTM 2026 line-up imported
Added the 2026 KTM range (Duke, Adventure, Enduro, SMC and Super Duke families) from
the official technical specification sheets.
2026-05-24
data
Yamaha 2025–2026 line-up imported
Added the 2025 and 2026 Yamaha range — MT-07, MT-09, XSR, Ténéré 700, R-series and
the YZ off-road family.
2026-05-24
data
Honda 2024 line-up imported
Added Honda roadsters, sportives, off-road and scooter ranges from the 2024 brochure
collection.