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Speed difference between a mountain bike and a road bike....(11 posts)

Speed difference between a mountain bike and a road bike....kylebike
Sep 13, 2002 1:23 PM
I am currently training with a mountain bike on the road and have not yet purchased a road bike. I plan on entering some races in the fall.

My question is.....how much faster can I go using a road bike?? Would it put on an extra 5km/hr? 10km/hr??? more??

Thanks
depends...jose_Tex_mex
Sep 13, 2002 1:33 PM
I have personally gone out on my mtb bike (GT Zaskar) with Slicks and dropped many team member roadies. If you have a good mtb it may be better than some road bikes.

HOwever, your mtb is probably heavier than a road bike. I would speculate an extra 5km/h but not 5mph.
re: Speed difference between a mountain bike and a road bike....mapei boy
Sep 13, 2002 2:10 PM
Assuming you're going to buy a pretty good road bike, you will find the speed difference between the road and the mountain vehicles to be dramatic. Night and day. Mind-boggling. The difference between a mule and a thoroughbred.
After riding around on mountain bikes...Spoke Wrench
Sep 13, 2002 2:28 PM
your road bike will feel like it has a motor.
Realistically, 2-3 mph ...Humma Hah
Sep 13, 2002 2:38 PM
... depending on how fast you are to begin with. If you're basically an easy-going group rider, cruising along flat sections somewhere in the 18 mph range, expect an increase of about 2mph at the same power level.

In the 25 mph speed range where the roadracers claim to spend most of their time, the drag advantages of a roadbike translate to about 3 mph.

The faster you are, the more the improvement. The big advantage, after you lose the knobbies, is almost all aerodynamic, and the drag goes as velocity squared. Power required to go faster goes as velocity cubed. The faster you go, the more the aero drag penalty, and the bigger the advantage of a roadbike.

All advantage diminishes greatly if you can't get comfortable riding in the drops, a problem for some MTBers.
Humma Hah's got it right (nm)Kerry
Sep 13, 2002 3:54 PM
re: Speed difference between a mountain bike and a road bike....Chainstay
Sep 13, 2002 4:15 PM
I find the front shocks on my MTB suck up a lot of my power when I go deep. I can gear down and spin more and that's OK but on a road bike there are a lot of times when you just muscle through a short hill or dig in to close a gap. I can't do that on the MTB. Its 5 mph slower if not more.
re: Speed difference between a mountain bike and a road bike....moabbiker
Sep 13, 2002 4:49 PM
Depends on how your MTB is outfitted: with full knobbies and 11-32 cassettes, the difference will be huge. But if your MTB has lightweight wheels, 1.25" slicks, Dura ace 11-27, and under 23 pounds, it wont be THAT much different from a typical low end road bike. Although riding position will always be a lot more comfortable on a road bike simply because the drop bars are better suited than the straight bar the MTB uses. Aerodynamics may therefore help you quite a bit too.
you should be able to ride farther at the same speed for sure.niteschaos
Sep 13, 2002 6:40 PM
once you get used to the handling and position on a road bike, you should be able to go much farther at the same speed as you would on a mountain bike.
re: Speed difference between a mountain bike and a road bike....Tenny24
Sep 13, 2002 7:47 PM
I just recently bought my first road bike, a Giant OCR3. There is a big gain in speed, the biggest problem wtih mountain bikes is front and/or rear suspension and the gearing on a mountain bike is a lot different. To top it all off the tires on a road bike are 700cm which gives you another big advantage, its a lot more then aerodynamics in my opinion. I got my road bike 2 days ago, and had my first fairly long ride on it today, it was really windy though so my speeds are lower then they would have been if i wasnt going against the wind all the time. Anyways, on this trip on my mountain bike i would average 18, on the road bike i averaged 22 and it was against wind. You will find the road bike more comfortable, and it sprints faster. If you put two riders side by side, one on a mountain bike with knobbies and suspension and one on a road bike, have them go 15km/hr and then race up to 45 the road bike will easily win. me and my buddy where doing something simmilar today, it was a lot of fun. You can really get the power down on these and accelerate, much faster through the turns as well i find. Everyone is going to be different though, so i would try and find one to borrow and see what you think. Oh and one more thing, comming from a mountain bike onto a road bike, your nuts and ass wont be as sore :)I think it has to do with the riding position it must put less presure on the jewels, could be that the OCR3 has a better seat, but I doubt it.

Mike
re: Speed difference between a mountain bike and a road bike....aliensporebomb
Sep 14, 2002 8:21 PM
I was looking in my riding diary/log for the point where I
gave road riding a try again last year and these are the
comments I made:

"Road Bike for the First Time In Over a Year - SPEED!
Might re-think what I get - 12 miles in 35 minutes!"

I'd been riding mountain bikes for two years exclusively
and riding that roadie ride was an addiction. And I did
end up getting a new road bike instead of a new mtb.

So, give it a try. You won't regret it.