The Goniometer is a multi-purpose tool that can be used to measure various body angles and positions related to bike fitting. It has a color-coded dial that helps determine optimal joint angles, including knee flexion between 27-37 degrees, which is the consensus for optimal saddle height. The Goniometer can also measure other angles like the trunk, shoulder, elbow, and stem to ensure proper bike positioning.

1. Bike Fitting Tools
This is another “standard” in Bike Fit
Goniometer MP (G-Meter) -- the cycling-specific, color coded goniometer.
Use to easily and quickly Use BikeFit’s Goniometer to easily and quickly determine
determine joint and body
joint and body position angles. Constructed of clear plastic,
position angles. Multi-purpose
measurement device. 17.75” folded, that’s longer than most medical goniometers.
Multiple cycling specific component & body measurements
Part# 50003 can be taken with this device. This is a standard component
of the Bicycle Fitting System.
Measuring Seat Height:
While safely on a stationary trainer, pedal enough to get warmed up. After a few minutes of pedaling, stop with leg extended and foot
at bottom of the pedal stroke.
a. Theaid you in determining optimal b.
to
Goniometer is the perfect tool After a few minutes of pedaling,
stop with leg at bottom dead c. Startinggreater hip, palpate(bony
for the
at the
trochanter
(feel)
saddle height. The Goniometer’s center (BDC) of the pedal stroke. prominence on outside of hip).
color coded dial will help in Some help may be needed to This is the reference point for the
finding best angle ranges. catch and stop movement with upper arm of the Goniometer.
heal in same position as during
pedaling. This is a starting
point for optimal saddle height
determination.
Knee Flexion
~ 27˚ to 37˚
d. The axis (center dial)be at a
Goniometer should
of the
e. Keeping the Goniometer dial
centered on the knee, direct the f. The concensus on optimal saddle
height starting position for road
bisecting point of the knee joint. lower arm towards the lateral cyclists is 27 to 37 degrees flexion.
malleolus (bony prominence on Overall road riders may have a
the outside of the ankle). slightly taller seat height than off-
road cyclsists. Repeat this process
after any saddle adjustments.

2. Measure The trunk angle can be Measure The angle between
any position the cyclists
Trunk finds comfortable. Shoulder the trunk &
shoulder (bisect
angle: It is important that the angle: trunk & upper arm)
cyclist bears weight on
the ischial tuberosities
(two sits bones on pelvis)
to avoid placing excess
pressure on soft tissues. should be
Bisect torso & parallel approximately
to ground for best 90 degrees.
placement
Measure Bisect upper & Measure
Handlebar
lower arm for best
Elbow placement.
angle: width:
The elbows should
have a slight 15 to 25
degree bend.
handlebars handlebars
46 44 42 40 38 36 36 38 40 42 44 46
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
stem
For body dimension, place dial in center of chest (sternum) and
Measure to the crease between torso and each arm (armpit).
Stem For handlebars, measure width from center-to-center at the
length: lower section of the drops. This suggested measurement should
match the width of shoulders. Let comfort be your guide.
stem 15 14 BIKEFIT
13 12 11 10 9 8 7 6 5 4 3 2 1
Measure 46 44 42 40 38 36
handlebars handlebars
36 38 40 42 44 46
center of the stem
15 14 1
stem binder
bolt to the
center of
the bars.
Measure Neutral or Rising or Dropping or
Stem 90°/0° stem 110°/+20 stem 70°/-20 stem
angle:
170 160 150 1
180 40 1
70 3 0
170 160 150 14 01
180 0 13 16
12
170 170 160 150 14
0 180 50
0
01
60 170
1
11
1 30
12
0
0 0
0
16
0
15
14
100
If the stem is
12
11
0
0
15
0
130
0
11
14
100
90
0
0
130
14
100
0 110 120
downward
90
130
80
90
0 110 120
80
0 110 120
angled, record
70
80
90 10
70
70
90 10
60
as a negative
90 10
60
80
50
60
80
50
number ( - ). If
70
80
40
50
70
40
60
70
30
40
60
30
stem rises, note
50 20
60
30
50 20
40 10
40 10 50 20
30 0
20 10
30 40 10
it as a positive
20 10 0
30 20 10 0
number ( + ).
425-821-7237
www.BikeFit.com P.O. Box 2156 • Woodinville, WA 98072-2156 • USA