RDL

I have a older set of reynolds Dv46c with Vittoria open corsa evo cx tires. The wheels are rated up to 150psi and the tires from 115-145psi. I run 95-100psi on the front and 115 on the back with my training wheels and it may be a little on the high side.
I weigh about 150lbs. Any idea's on what psi I should run during races?
Thanks for any help

ed073

110psi in both and you'll be fine.

semaj

From what I understand, tire pressure shouldn't vary between manufacturers but should vary between different tires sizes. I'm currently 167 lbs, my bike weighs approximately 17 lbs, and I run my front tire pressure around 105 psi and the rear as 110 psi with manufacture rated 23mm tires. With this set up my bike feels planted on the road and doesn't skitter across road imperfections and I feel planted and secure when cornering and descending hard.

Given your weight of 150 lbs I would try running your tires as 95-100 front and 100-105 rear and see how that feels (assuming you are running 23mm tires).

carpediemracing 

I have the same wheels DV46c and run about 105/110 to 110/115 on 700x23 Michelin Krylions. I raced/trained on those pressures at 180-190+ lbs + a 16 to 19 lbs bike (bottles, bag, pump, lights, or not). On a few rides recently at 160-165 lbs they felt "normal" at those same pressures, including some very fast switchbacks and even a crit (albeit all on box section alum rims).

Symptoms of too high pressure - some chattering in high speed or high lean corners, esp in rear if you're weighing the front.
Symptoms of too low pressure - pinch flats (or almost pinch flats) and some washing out in hard turns.

On tubulars, similar size, I run 120-140 psi with Vittoria CXs. With Contis, 160+ psi, else they feel too soft. I've raced the same course, similar conditions, fast turns, on all three tires, with similar results/feel (well as far as handling goes). The handling characteristics apply in general - on narrow 17 mm tires at 145 psi when I weighed 115 lbs (i.e. way too much pressure - youth, ignorance, and "hoping for a great day"), the tires chattered a lot in even sweeper type curves. Disaster of a race although I didn't crash or anything.

cdr