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Comparison Berg Duo Chopper BF vs Berg Chopper AF

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Berg Duo Chopper BF
Berg Chopper AF
Berg Duo Chopper BFBerg Chopper AF
from $1,275.00 
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Age group, from5 years5 years
Suitable foruniversaluniversal
Designtricycletricycle
Specs
Maximum weight120 kg130 kg
Number of seats22
Adjustable seat
Reverse
Hand brake
General
Front wheel diameter40 cm
Rear wheel diameter40 cm
Wheel typeinflatableinflatable
Wheel designoff-roadautomotive
Fenders on rear wheels
Dimensions170х106х99 cm167x84x86 cm
Weight68.9 kg49 kg
Color
Added to E-Catalogjune 2017february 2015

Maximum weight

The greatest weight that a velomobile is able to carry for a long time without breakage, in other words, the maximum load on the structure that is permissible for normal operation. This load takes into account the weight of the driver, luggage, and in multi-seat models, passengers as well (that is, it is indicated for the car as a whole, and not for a separate seat). This parameter is connected primarily with the purpose and age category (see above): the “older” the velomobile is, the more weight it should normally carry.

Of course, when choosing a machine, one should proceed from the fact that the maximum load indicated in the characteristics should not be lower than that planned in real conditions; but at the same time it is desirable to have also a certain reserve. This is related to two things. Firstly, this parameter is usually given for flat roads; and when driving through pits, potholes and other irregularities, the velomobile may be subjected to off-design loads even with a formally permissible weight. Secondly, most often velomobiles are bought for children; and as children grow up, a margin of weight is simply a must — otherwise the machine will very quickly become unusable.

Also, do not be deceived if, when the maximum load (accidental or intentional) was exceeded, the velomobile did not break down immediately — overload anyway negatively affects reliability and can lead to early breakdown.

Reverse

The ability to use the pedals of a velomobile to move not only forward, but also backward. Note that the simplest type of drive — to a rigidly fixed driven gear (when the pedals rotate and when the velomobile is idling) — does not provide reverse, this requires certain design tricks. Therefore, if it is important for you to be able to freely ride not only forward, but also backward, you should choose a car in which such an opportunity is directly stated.

Note that most often the movement back is carried out simply by rotating the pedals in the opposite direction, however, some models may include the inclusion of a "reverse gear" with a special lever, usually located on the frame.

Front wheel diameter

The diameter of the front wheel(s) of a velomobile. In fact, this parameter is important, first of all, taking into account the fact that large wheels have a higher cross-country ability than small ones. In addition, data on the dimensions of the front and rear wheels make it possible to evaluate the appearance features (see above): for example, some "special equipment" may have small front wheels and large rear wheels, like in real tractors.

Rear wheel diameter

The diameter of the rear wheel(s) of a pedal car. The value of this parameter is the same as the diameter of the front wheel (see the relevant paragraph).

Wheel design

Appearance describes not only the general design of the wheels, but also some specifics of their functionality.

— Bicycle. Bicycle wheels have two key distinguishing features: the presence of separate spokes connecting the rim to the centre of the wheel, and a relatively small width (due to which they are poorly suited for off-road). However, the width in different models may be different; the same applies to the size, shape and number of spokes.

— Automotive. Wheels, the disk of which does not have pronounced spokes, and the overall width, usually, is greater than that of the bicycle wheels described above. In this case, the disk can be either solid or with slots. Similar discs are also used in off-road and tractor wheels (see below), but a distinctive feature of automotive varieties is the tread pattern - it is either shallow (on "universal" tyres and some racing tyres) or not at all (this option is found in entry-level models) . Thus, the main purpose of such wheels are relatively flat surfaces.

— Off-road. Wheels with a solid (or almost solid) disk, which differ from the automobile wheels described above by a deeper tread pattern, and sometimes by larger sizes. This design is designed to make it possible to successfully move not only on smooth asphalt, but also on rough terrain such as dirt roads or even off-road (although without much “fanaticism” - for example, such wheels are usually not intended for deep mud). ). At the same time, note that...in the simplest velomobiles designed for children (see "Destination"), off-road wheels can be a dummy, designed solely to provide an external resemblance to a real all-terrain vehicle; in terms of driving characteristics, in such cases they do not have advantages over automobile ones.

— Tractor. Further development of the idea of off-road wheels (see above). Tractor varieties are distinguished by a deep tread pattern with powerful lugs, as well as an even larger size. Thanks to this, full-fledged tractor wheels are able to successfully overcome not only dirt roads, but also difficult obstacles such as puddles, viscous wet earth, etc. However, this category also includes another variety - wheels that only imitate tractor wheels and are not intended for difficult conditions. They are found in children's models of velomobiles (see "Intended use").

Note that some models can combine bicycle and car wheels in their design (other combinations are not found for a number of technical reasons. In such cases, the type of wheels is indicated according to the majority principle - for example, for a trike with two rear wheels of an automobile type and the front bike will be indicated exactly the car.

Fenders on rear wheels

The presence of protective fenders on the rear wheels of the pedal car.

Such fenders provide some protection from dirt flying from the wheels of the car while driving; First of all, they protect the driver and passengers, but for others, the presence of fenders may be useful. This piece of equipment is especially important when riding in wet weather or on wet ground.

Dimensions

General dimensions of the pedal car. This parameter allows you to evaluate, first of all, the convenience of the car in storage and transportation. Note that for models with a trailer (see above), dimensions can be indicated both with and without a trailer.

Weight

The total weight of the velomobile in curb condition. It is indicated, usually, taking into account all the additional equipment supplied in the kit — in particular, the roll bar and the trailer (if any, of course; see above for more details). The value of this parameter is twofold: on the one hand, a large weight makes it difficult both to transport the car and to ride it, on the other hand, it contributes to stability and reduces the risk of a rollover. Note that for each purpose (see above) there are certain weight ranges: for example, for children's velomobiles, 40 kg is too much, and for universal models, on the contrary, too little.