Texas - space race on a ss mountain bike

I was planing on doing the 77 mile ride on my old dback that got converted to ss a while ago. I have tried to make it a lite as possible and have been training on it a lot. On the weekdays when the bike is working right and when I can I try to ride it around at tarry hershey park and on saturdays I ride from hi-6 to down town and back.
Is this a comin thing? As in people usely ride what they want. And is there any climbs on this ride? And has anyone done it on a ss and has any tips? This is my first organized ride.

Thanks.

I assume this is the space race in Houston, starts at Nasa?

If you can ride the distance, then it doesn't much matter what kind of bike you're riding it on. However, my general impression of the organized rallies is that 95%+ of the people there are on road bikes wearing lycra (more accurately, on skinny-tire bikes- I don't know a "road" bike from a "touring" bike, etc). Usually, the shorter and easier the event, the more people you'll have showing up on mountain bikes, etc. But don't let that keep you away.

I can't think of any place in that whole area that has any hills, so I think you'd be reasonably safe there. If your bike is geared high, wind might be more of a problem than hills.

I've ridden two or three organized rides up here in the Dallas area on my Industrial Cruiser bike. It can be more of a challenge on a single-speed, depending on the hills and the gearing. I've gotten a few "cool bike" comments on it as well. I don't wear lycra but nobody seems to care one way or the other about that, either.

On riding the distance, take a look at the route map. A lot of the routes will let you start on the longer route, but then there's places to switch to the shorter routes if you feel the need. And in a non-competitive event, no one cares if you sign up for the 100-mile ride and wind up doing the 25- they'd probably rather have that than to have to haul you back from the 50 mile point in a van. Somewhere, I've read that you should be able to do 3x your normal training ride. If you're in good physical shape and doing short training rides, probably a lot more than 3x. The limiting factor tends to be hills and wind, rather than just riding along.

If your bike is also a fixed-gear, that's something I haven't tried. I like coasting, myself.

If you'll look up there, there's a Sticky for "Texas Rides" that has bicycle-stuff.com (mainly north Texas) and also another site. Both those sites have pictures of some of these rides. Look through some of them and you'll have a pretty good idea what to expect. I just see one or two shots from the space race here:
http://www.bicycletexas.com/imagesmisc.htm
But the other rallies should be similar.

One other thing. Speed. All these people may be dressed like Lance Armstrong, but they don't all ride like him. If you can move along at a pretty good clip, you're guaranteed to be going faster than a lot of other people out there.

Yeah I think I will be fine.. I will sing up for the 80 mile ride and if I dont think I can do it I will just ride the sixty mile ride the day of it. No the bike is not fixed. I have a 36/14 gearing on it. I have done a lot of little fun thing to the bike so its going to fun to ride it on. I would do it on a true road bike but I just dont have one...

Your gearing sounds reasonable. I say go for it, just remember to take it easy for the first 50 miles so you you don't kill your legs.