There are two types of trikes available in the sports equipment market today, namely, the delta and the tadpole. The delta trike is designed like a conventional tricycle. It has a pair of wheels at the back. The tadpole is rather unconventional. It has a pair of wheels in the front. It is seen that the tadpole models are more in use than the delta models. With the tadpole model you will have problems embarking and disembarking from it. In comparison to the manufacturers of delta models, you can get to see more number of manufacturers of the tadpole.
A recumbent bicycle is a bicycle that places the rider in a laid-back reclining position. For most riders, the advantage of riding a recumbent is that it is more ergonomic; positioning the riders weight more comfortably by distributing it over several square feet of the back and buttocks. On a traditional upright bicycle, the body weight rests on a few square inches of the sit bones, the feet, and the hands.
Recumbents are available in a wide range of configurations, including: long to short wheelbase; large, small, or a mix of wheel sizes; overseat, underseat, or no-hands steering; and rear wheel or front wheel drive. A variant with three wheels is a recumbent tricycle.
Highracers are generally more manoeuverable than lowracers since their higher center of gravity allows stability at lower speeds (see Bicycle and motorcycle dynamics). Given the same seating position they may be faster than lowracers, since it is widely believed that larger tires have lower rolling resistance, although good data on this subject are scarce.
Starting and stopping. Because of the supine position, most recumbents do not allow the rider to push forward with the feet on the ground. This makes for slow starts and requires excellent balance. However, since starting a bicycle by pushing the feet against the ground is probably a poor way to start, this criticism may invalidate itself. Starting a recumbent does not require great strength; it is a matter of balance and a skill which must be learned. It is best to learn from an experienced rider, who can help with a little push at first. Several rides may suffice to become confident enough of one’s starting and stopping skills before becoming ready to ride in traffic or perform uphill starts. Recumbent tricycles do not require balancing and hence do not require any special skill in this regard. With many recumbent seats quite low it is often easier to get a foot down onto the ground on stopping than is the case from a conventional bike with the saddle set high for optimum pedaling.
Uphills. A perceived and much debated disadvantage of the recumbent position is that it is more difficult to ride up hills. This is most noticeable during the initial period of riding a recumbent when the legs are not yet trained for the different muscle requirements. On a traditional bicycle, the rider can stand on the pedals and pull against the handlebars, although on a recumbent the rider can push against the seat. On either style, higher cadence reduces leg strain and fatigue when climbing. Recumbent tricycles are a special case, as riders can climb almost any gradient of hill (subject to tire traction) with appropriate gearing since balance (and hence speed) is not an issue.
Visibility of the road. The distance from the eyes to the front end is somewhat larger than an upright, and also the rider cannot lean forward. This leads to a bad insight angle at sharp corners. (Car drivers have the same problem, though less acute, since they are closer to the middle of the street.) In some designs – noteably low-racers – the rider is also significantly lower than on a conventional bicycle and so visibility can often be obscured by fences, parked cars, etc. It is also a bit more difficult to glance back which can be addressed by adding helmet or handlebar mirrors.
Safety. Although recumbent bicycles are generally considered safer than upright bicycles (as noted above), they do have some specific safety issues. A type of injury characteristic of recumbents called “leg suck” occurs when a foot touches the ground and the bike runs forward over the contact point, causing ligament damage and, in some cases, ankle fractures. The use of clipless pedals reduces this possibility by preventing the foot from slipping off the pedal. But with clipless pedals, remaining clipped in during a front tire or wheel failure at high speeds can result in the recumbent rolling over the rider and taking a clipped in leg or legs with it. This scenario, although very rare, can create severe spiral fractures of the femur rarely seen with upright bicycles.
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