Quoted message said:I'm on a budget but want to get back into cycling in a
big way.
I need a bike for long distance touring and commuting.
And also can see myself doing some light off road
cycling such as dirt trail and roads.
Is it impossible to have only one bike do it all above?
Is it necessary to have a touring AND a MT bike with
front shock?
As long as you have reasonably wide tires (i.e. 28-mm or greater) and
are willing to portage the bicycle over rougher areas and not attempt
stunts like "getting big air", most off-road trails can be negotiated
with a road bicycle, including single-track. I would also suggest
conventional wheels with reasonably strong rims and 36 or more spokes,
as one or two broken spokes can temporarily be accommodated, which is
generally not true for low-spoke count "boutique" wheels.
The only times that I find front suspension on an ATB to be of
significant benefit are over sections where there are a LOT of roots or
wash-boarding, or when failing to miss cobble size rocks.
Wide knobby tires are helpful in loose gravel and mud, but not
essential. Mud is best avoided for environmental reasons, and because
it fouls the braking surface on rim braked bicycles. Clean sand is the
one area where wide tires and lower pressures are a near requirement,
but this is not too commonly encountered in many geographic regions.
The bonus of having a road bike that can accommodate moderate off-road
use is that it will be more stable to ride on the road, suffer from
fewer pinch flats, have better weight distribution (longer chain
stays), and clearances to accommodate fenders and some wheel
mis-alignment. The loss in speed compared to a dedicated racing bike is
small enough it will take a stopwatch to measure.
An option that will cost a couple of hundred dollars is to have two
wheel sets; one with a relatively narrow (e.g. 25-mm) tires for paved
road use and one with relatively wide (e.g. 32-mm) tires for mixed and
off-road use.
The opinions of a well known poster who frequently rides on unpaved
roads and trails on a drop-bar road bike:
<http://yarchive.net/bike/mountain_bike.html>.
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Tom Sherman - Post Free or Die!