dumb question

[madisongrrl]

I've been racing on tubulars for the past three years. This allows me to run a very low psi without pinch flatting (something you'd do with a clincher). I also have regular clinchers and tubular clinchers. By running a super-low psi, you have a larger contact patch on the tire. The biggest mistake most new racers is running to high a psi.

Velogirl,

This is my first season of CX, so I've got many things to figure out...including tire pressure. What is the lowest psi that you would personally use without getting pinch flats?

[velogirl]

I've run in the low 30s on my clinchers (rated to 40psi min, I think) and into the 20s on my tubulars. And I'm a big girl.

And I won't say it, but I've never (you know what) -- knock on wood!

One way I learned what pressure to run was start high. I used to always start aroudn 45psi for my pre-rides. As I would ride the course, I'd see if I was bouncing around (too high). If so, I'd let some air out until I liked the feel. Then I'd check the pressure with a guage (I've got a digital one). After doing that for a while, I've learned what I like.

Although, I still raced with too much air my first race this season. I put the wrong type of valve stem extenders on my new tubulars and I couldn't check the pressure. It's was the first race with lots of distractions and I didn't take enough air out. Was sliding around all over the place.

[telegirl]

Thanks for the question, Ruth! And to Velogirl for her answers!

All of the pros I know LOVE their tubulars, but I was thinking that in cyclocross, it would be a detriment to use tubulars because of the difficulty in fixing the flats (I know racing, you probably have multiple tires already on rims for quick change, but I am talking about just going out and about off road)- And are tubeless becoming popular in the cyclocross arena?

Now that I have my new baby coming, I started getting more tire and rim geeky....frightening.....

[velogirl]

If you don't race, you don't need tubulars. Stick with your clinchers and you'll be fine.

UST tubeless technology hasn't hit the cross scene yet, although Tufo makes a tubular clincher (basically a tubular with a bead so it fits on a clincher rim). I just got some and it was hecka-hard to mount. I couldn't do it by myself and even me & a big guy had a hard time doing it together. It's so tight because it's designed to seal the rim. In my opinion, this would be super-hard to change a flat.

Did I mention you should just stick with your clinchers?

[telegirl]

Hmm, maybe I should stick with clinchers; at least that is what I am reading between the lines there, Velo - I might do some local racing, but just for the fun of it.

Thanks! About the last thing I would have thought I would be is a tire geek....wow, now I just need a pocket protector for my bike jersey.

[madisongrrl]

I've run in the low 30s on my clinchers (rated to 40psi min, I think) and into the 20s on my tubulars. And I'm a big girl.

I ran my clinchers at 37psi this weekend. It worked well with the course. I'm not sure how I would feel dropping it below 35, but I'll have to experiment. I really wanted to run them lower than 37psi, but I was too chicken. One of my teammates sometimes drops her tire pressure to 28-30psi and doesn't have problems with flats. I really like the feel of riding on a lower tire pressure, but I fear the DNF too much.

[spokewench]

Some of our courses in Flagstaff are way to rocky for running really low pressure - they are not typical smoother cyclocross courses so typically I can't run real low pressures -
but since it looks like the only cyclocross this year will be down south in Tucson and Phoenix (whoever heard of cyclocross without snow??? ); I'll probably be able to run higher air pressures