There are plenty of different bike types, plenty of different riding terrains and conditions, and plenty of different fitness levels among the riders - so the question really doesn't make much sense. A fit rider on a road bike in flattish terrain can average 20 MPH w/o trouble, while a MTBer on a technically challenging trail might average 8 MPH. You pick which average you think is more fitting.
There's really no sensible answer to that, as it's too dependent on riding conditions. Can be anything from 8-10 MPH to 15-20 MPH. Like asking for the speed of a SUV, w/o telling if it's at the highway or out on a trail.
Also, the speed of the bike is entirely dependent on the rider. A professional cyclist will have a much higher speed then a beginner. Rider plays a big a role as terrain.
Not particularly, 10 mph is below average sprinting speed. The record speed on a mountain bike is above 100mph.
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.
Mountain bike
There are a few good mountain bikes tires that would suit a 18 speed bike. I would go to a bike store and ask.there's different tires for what type of riding you doing but everyone have their own way they like their bikes from handle bars to tires. There's no best part. It's just what's good for you
depends 2 stroke of 4 stroke and racing bike or a trail bike
Average speed is 6km/3hr = 2km/hr = 2KPH.
20
Average speed = total distance / time taken = 90/3 = 30 mph
Mountain Bike Rally happened in 1994.
A road bike is faster on the road than a mountain bike. That's all
Depends on the type of MTB, and where it's ridden. The current speed record for a straight line downhill run is about 100 MPH for summer conditions and about 130 for winter conditions. On the flat - a cross-country race - the average speed can be about 20-25 MPH.
Mountain bike magazines focus on mountain bike tracks, tips and information regarding bikes in general as well as helpful tips about bike parts and repair.