he ride a yellow bike that hasten speed
Need to be a complete question to get an answer.
It is a heavy bike ... so what is the real question?
A tandem bicycle is a bike for two riders, one after the other, with a set of pedals for each. A 10-speed bike can be two different things. Either a bike with two chainrings by the pedals and five sprockets at the rear wheel, or if it's a newer bike, 10 sprockets at the rear.
There's really no telling, say between 18 - 30 lbs.
Depends on you, your bike, your speed and the size of the jump. Weak bike + heavy rider + big jump + high speed will add risk to it while strong bike + light rider + small jump + low speed will make it fairly safe. You will probably be somewhere in between these extremes so there's no way of telling how "safe" you will be.
I'd suggest that you visit www.parktool.com, it's a really helpful site.
Generally thinner body with nobbly tyres; keeps the bike light and easilly manouverable. Big heavy bikes are designed for speed and will be out of place off-road.
A cruiser bike is a bike that gives an upright riding postion, is usually blinged out, and is ridden rather sedately. MTBs are available in several different versions(XC, AM, DH), but basically they're about providing a compromise between ruggedness and rideability. Mountain bikes have much knobblier tires and usually have suspension, which is rarely available on cruisers. Mountain bikes are also used competitively.
A trial bike is built for speed on a course, and is generally very lightweight. On the other hand, it isn't suited to very bumpy rides. A trail bike is the reverse. It is heavy duty, which makes it slower, but more stable and reliable.
a 10 speed racer is a dirt bike a 10 speed racer is a dirt bike
no