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11
3. Adjusting the Bicycle to the Rider
Your body height and proportions are decisive for the frame size of your
bicycle. Make particularly sure there is enough space between your crotch
and the top tube so that you do not hurt yourself, if you have to get off
your bicycle quickly.
3.1. Sloping Geometry – How to Determine or
Measure the Frame Size
STEVENS road racing frames of the latest model series have a “sloping ge-
ometry. This means that the top tube inclines towards the seat tube and
is not in parallel to the ground.
This gives the frame a more compact appearance and more stiffness in
the area of the bottom bracket. For this reason sloping frames can also be
used under certain circumstances by riders who have problems getting on
and off their bicycle with a level top tube due to a bigger standover height
(standover clearance when standing over the bicycle). Even though the
optical proportions of the bicycle may appear mismatching due to the
deeply inserted seat post, the selection of a sloping frame is a reasonable
alternative.
The sloping design requires a modied formula to determine the frame size.
In the case of STEVENS road racing frames the frame size is normally meas-
ured from the bottom bracket centre to the upper edge of the top tube.
The size of today’s sloping top tube“ frames is measured in a different
way than a few years ago when the seat tube length was the decisive
measure. The seat tubes are now shorter in general; the “nominal meas-
ure of seat tube and top tube are therefore considered to determine the
optimal frame size. These are quasi theoretical dimensions with an imag-
inary straight top tube.
In the case of the sloping top tube frames, the frame size (nominal seat
tube length) is measured from the bottom bracket centre to the upper
edge of the nominal top tube. This may be the same as the length to the
top tube of the seat tube, but it need not be.
STEVENS road racing frames sized 56 cm would have a 56-cm-long seat
tube (measured from the bottom bracket to the upper edge of the top
tube), if the top tube were in parallel to the ground. The seat tube is now
a little shorter; this does however not affect the seating position and the
length of the frame. These measures can hardly be measured; in our ge-
ometry tables on the internet you find the values for the nominal top tube
as well as for the real seat tube measures.
As a general rule, if you had a 56 cm frame (bottom bracket centre -–
upper edge of top tube) of the traditional design with horizontal top tube
before, you should opt for a sloping frame at STEVENS size 56 cm now, as
well. Because the frame proportions, such as the nominal top tube length,
remained the same. The only difference is the junction between top tube
and seat tube which was lowered a little. If you have determined your
frame size at 56 cm (bottom bracket centre – upper edge of top tube),
you should choose a road racing frame sized 56 cm and not a larger one.
Adjusting the Bicycle to the Rider
Note:
Do not take the length “bot-
tom bracket centre to upper
edge seat tube as frame size!
Note:
To check the frame size take
the separate geometry tables
as reference! You nd them
on the internet at www.
stevensbikes.de with the
individual bicycles.
12


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