There are plenty of different things on a MTB that might need to be tightened. I'll post a link to a list.
On average, a road bike is faster than a mountain bike by about 25 due to its lighter weight and smoother tires.
500$
A good race mountain bike would cost you about $6,000 to $10,000
$75
Anything from $50 to $800
A mountain bike can typically hold up to 300 pounds of weight, including the rider and any additional gear or equipment.
The difference is that the mountain bike tube is much burlier and wider than the dirt jump tube but may not be as strong in terms of hard hitting strength.
The recommended amount of sealant for a mountain bike tire is typically 2-4 ounces per tire.
It weighs about 14 - 16 lbs.
about 50-60 psi for uphill riding
A Mongoose Mountaiin Bike brand new at The Bicycle Shop cost $350 in 2010
The price for a 7-year-old mountain bike in good condition can vary, but typically ranges from 200 to 500.