Road Cycling - Mtb Shoes vs. Road Shoes

On my road bike, I've been using road shoes with Speedplay pedals for the last year or so. I do like the float of the Speedplays, but I do not like it when I have to get off the bike and walk. I generally do little walking, but when I do, it really sux. I'm considering getting a pair of mtb shoes (the (Specialized Pro Mountain Shoe (http://www.specialized.com/SBCEqProduct.jsp?spid=5327&JServSessionIdroot=s2gebcjzuu.j27001) I use for mtbing is very comfortable while walking), and perhaps a pair of the Crank Brother's Egg Beaters (http://www.crankbrothers.com/products/pedals_s_eggbeater.php) for my road rides.

So, my question is this ... what is the difference between a mtb shoe and a road shoe really? Is it simply a matter of stiffness? If so, I may be willing to give up some stiffness for comfort.

Is anyone else running a similar (egg beaters on road) set-up?

Comments?? Thoughts????

ThanX!!!!!!!

The two biggest differences would be weight and stiffness of the sole.

I think weight may be the big thing... and the MTB shoes have rubber cleats (for lack of a better word) so you can walk easier... I know Sidi makes a road shoe,a nd a MTB shoe... they are nearly identical, except for the walking lugs on them

Jeff

I ride with Sidi dominator mtb shoes and Time ATAC pedals and walking isn't a problem. I was genuinely surprised by the flex in the Sidi sole but I'm not sure if the road model (Genius, I think) is as compliant. I'd be surprised if it were.

I'm running an Egg Beater setup on my road bike, with Specialized Sport MTB shoes. While I'm happy with the setup, I do find a few hot spots on my feet on rides over about 25 miles, which I think is probably from the smaller contact patch on the pedals. I'll probably change the pedals and shoes out for some road pedals (maybe Time Impact) and new road shoes (don't care about the brand, just whatever fits best). Egg Beaters actually have a pretty good contact patch for a mountain pedal (cleat contact patch + the flat bits either side of the 'beater') but it's nowhere near the contact area of most road pedals.

A lot of the mountain shoes I've looked at are almost or sometimes equally as stiff as their road counterparts, so the only added weight is probably in the tread on the sole. Egg Beaters are such a lightweight pedal that there's possibly very little difference in total weight.

I also have eggbeaters but use sidi rampa3 MTb pedals and they are great, I like the stiff sole and have not had any problems with hotspots.

I have Eggbeaters on my 'cross bike which I use as a road bike and I'm getting some Sidi Dominator shoes.If you do road races get some road shoes and pedals but for most people I think Mtn. shoes are fine.
The Dominators are almost the same as the Genius shoe.