MANUALº aSSemBlY - Science to Sport

OBF 0.2 ||
ASSEMBLY
MANUALº
Yo u r B o d y º Yo u r B i k e º Yo u r F i t º
sciencetosport.com/bikefit
Optimal
Bike
Fit
Yo u r B o d y º Yo u r B i k e º Yo u r F i t º
º While some bike fitting methods use subjective assessments
to assess position and others take limited static measurements,
almost none take dynamic characteristics such as training
history, training load, flexibility and discipline into account.
This is what sets ErgoFiT apart.
ErgoFiT.
A scientifically formulated cycling ergonomic product.
1
2
3
4
5
Saddle
Height
Saddle
setback
reach
drop
additional
information
[1]
[2]
[3]
[4]
[4]
INSTRUCTION MANUAL
[1]
Bicycle assembly instructionsº
1.1 Saddle height
Saddle height is measured from the centre of the crank axle to the
top of the saddle, passing through the centre of the bicycle seat
tube and seat post.
Ergofit values calculated for road and mountain-bikes are for frame seat angles of 74º only. For frames with
differing seat tube angles, multiply the Ergofit seat height by the correction formula below:
Seat Angle
Ratio
Seat Angle
Ratio
71
71.5
72
72.5
73
73.5
1.01665
1.013643
1.01073
1.007911
1.005183
1.002547
74.5
75
75.5
76
76.5
77
0.997542
0.995171
0.992888
0.990689
0.988576
0.986547
For complex frame shapes such as dual suspension units with seat masts, seat height should be measured to
the top of the saddle at a 74º angle to the crank axle. This can be achieved using the Science to Sport ErgoFiT
jig (available separately).
1 | ErgoFit
Saddle setback is measured as the horizontal distance from the
front of the saddle to the centre of the crank axle.
Prior to setting saddle setback,
confirm that the distance
from the center of the ischial
tuberosity padding to the front
of the saddle is 22.5cm.
For saddles that do not
conform to these dimensions:
Subtract the difference from
setback value for longer
saddles add the difference
to setback value for shorter
saddles (e.g. ladies saddles).
22.5
mm
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Bicycle assembly instructionsº
1.2 Saddle setback
INSTRUCTION MANUAL
1.3 Reach
Ergofit reach values are provided in two formats:
For frame sets with
For frame sets without
74º 74º
seat tube
angles
Reach A and Reach B
can be used.
3 | ErgoFit
seat tube
angles
Only Reach B or utilise the
Science to Sport ErgoFiT jig.
1.3.1 Reach A
1.3.2 Reach B
Reach A is measured as the horizontal distance
from the centre of the handlebar clamping
point to the centre of the seatpost or seat tube,
measured as the horizontal value only. For
frames with non-standard seat tube angles, the
ErgoFiT jig can be used to measure Reach A.
Reach B is measure as the horizontal distance
from the centre of the crank axle to the centre of
the handlebar clamping point.
For mountainbikes with handlebar rise,
measurements should be taken from the centre
of the handlebar grip position and not from the
clamp point.
Drop values should be measured as the vertical distance from the top of the saddle surface to the centre of
the handlebar clamping point.
For mountainbikes with handlebar rise, measurements should be taken from the centre of the handlebar grip
position and not from the clamp point.
1.5 Additional information
1.5.1 Saddle height and setback values are given for neutral cleat
positioning values
Neutral cleat position refers to an axle position which is aligned directly below the 4th and 5th metatarsal
heads (ball of the foot).
1.5.2 Saddle heights are measured inclusive of cleat, pedal body and
shoe sole thickness
Shoe thickness is assumed to be 3mm. Pedal body and cleat thickness is assumed to be 12mm.
Shoe and pedal units which do not conform to these measurements should either be subtracted or
added from saddle height measurements.
1.5.3 Effective top tube length
Effective top tube length refers to the horizontal distance between the centre of the highest portion of
the frame’s head tube and the centre of the seatpost. Refer to the manufacturer geometry specifications
or use the ErgoFiT jig to calculate the effective top tube length on non-standard seat tube angles.
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Bicycle assembly instructionsº
1.4 Drop
Yo u r B o d y º Yo u r B i k e º Yo u r F i t º
E | [email protected]
F | +27(0)86 638 8632 W | sciencetosport.com/bikefit