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Folding Bike Frame Geometry
The Swift folding bike frame is remarkable in that it accommodates a large range of uses for cyclists of almost any size and shape. Part of the reason for this is that the seat post has a great deal of vertical adjustment and is oriented at 72 degrees, which means that adjustments to the seat-to-pedal distance simultaneously change the horizontal reach of the bike as well.
The diagram below illustrates the key dimensions and geometric relationships for the folding hybrid bike frame. The table at the rightbelow the diagram provides the specific values for seat-to-pedal distance and reach for various positions of the seat post. Note that the seat may be moved fore and aft by about +/- 1/2 in (12mm) from these nominal values by adjusting the position of the seat on the seat post.
|seat-to-pedal distance||reach with standard stem|
|30 in (750mm)||18.0 in|
|32 in (800mm)||18.5 in|
|34 in (850mm)||19.0 in|
|36 in (900mm)||19.6 in|
|38 in (950mm)||20.1 in|
The standard stem on the Swift is 60mm x 35D, 1-1/8in threadless. Swapping a 110mm x 25D stem will increase all of these reach dimensions by about 1.5 inches (37.5mm). We configure the bike at the factory with a 110mm X 25D stem for riders taller than 5' 10" (1.8m) and a 60mm x 5D stem for riders under 5' 5" (1.65m). See our page on sizing for more details
Most riders find that no vertical adjustment to the handlebars is necessary. However, there are two ways to adjust this dimension lower if desired. First, the stem can simply be flipped over, angling it slightly downward instead of upward. Second, the vertical stem riser can be easily shortened by cutting off a few millimeters from its height.
We also get asked by customers how they can get a more upright riding position. There are a few ways to achieve this. The first is to use/get the shorter 60mm x 25D stem if not already doing so. A second is to get the XXL (300mm) riser. A third way is to add a set of riser bars. For a few customers who wish for a very upright riding position, we have done all three. We do have 2" riser bars if this is of interest to you.
Some people have asked us how the Swift folding bike frame geometry compares to other bikes. The short answer is that it is very close to a "hybrid" geometry. The image to the left is an overlay of our folding hybrid bike on the outline of a Trek hybrid bike. You can see that the wheelbase is essentially identical. The seat-to-handlebar distance is also nearly identical. This explains why the Swift has such a solid feel and comfortable ride.