Bedienungsanleitung Stevens Race - 2014 (Seite 12 von 81) (Englisch)

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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.

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