salmoneous at wrote on 7/22/03 8:11 AM:

I've started comminuting a bit to work - 20km each way, but only on
good weather days. I think it time to stop taking my MTB and get
something more appropriate. Here's my question:

If we look at the continuum of bikes - from mountain to true road
bike, we trade comfort for efficiency as the bikes become more
road-like. I'm certainly willing to give up some comfort to shorten my
commute time.

'pends on what you describe as "comfort" - they transmit a bit more road
shock, particularly if you are running front suspension on your MTB. But,
if you are talking about your comfort on the bike, probably not. Get fitted
well and the different position will take a bit of getting used to, but
shouldn't be less comfortable.



What I'm not willing to give us is durability. By durability, I don't
mean the structural integrity of the metal frame over the years. I
mean the likelihood that flat tires or other mechanical problems will
interrupt my commute.


Road bikes should not be brittle. Flats may be a problem -- see below.

My route is on roads, but mostly on the shoulder where there is broken
pavement, gravel, debris, glass, etc. to deal with from time to time.
I've had to hop a couple of 1-2" branches. When I look at road bikes
with those skinny tires, I just start imagining all the problems I'll
have.


Look for a frame that gives you maximum tire clearance. That will be the
_minority_ of frames available. But, trusty steeds like the Surly, Soma,
Rivendell and others of that ilk are designed to take big honkin' tires
(technical term), which give you a lot of rubber to resist nasty little bits
on the road. Your tire choice will help a lot. (So will your piloting
skills.)

Here's a very good tire option:
http://www.rivbike.com/webalog/tires_tubes/10043.html


Is it just my imagination, or is there a real risk here? Is tire width
a key metric to look at, or are there other features I should care
about? (Yeah, I know, find a good LBS - but I'd also like you guys
opinions.)

Bicycle Fit is the key metric. Tire width is high on the list.

Hope that helps,

-- Jim

http://www.cyclofiend.com