Jseivert

I purchased some Continental GP 5000 700x32c tires for my road bike. Recommended PSI from their website is 85-100 but the bumps are harder than I expected at 80psi.

I'm wonder what psi others run with this tire with emphasis more towards comfort than speed.
I'm 6' 210lbs.

Thx!
Jeff

fietsbob

Your call , Know lower PSI risks pinch flatting and rim damage... ...

ThermionicScott 

If I were that weight, on a 25 lb bike, plus another 5 lbs for water and tools and such, I'd probably try 65 psi in front and 80 psi in rear and see how that works. Conti's pressure recommendations always seem high to me.

rm -rf

This tire pressure calculator works quite well for my bike.
Tire Pressure Calculator.

These pressures are very comfortable, and just as fast.

There's a somewhat increased risk of pinch flats -- be careful on fast downhills where a bigger chunk of gravel can cause a pinch flat that wouldn't flat at normal riding speeds. I went years with no problems at these pressures, then had two pinch flats in a year on downhills -- both times on very smooth roads with one larger rock/gravel piece in the middle of the road, that I didn't see. So I bumped up the front 5 psi, but that's probably not going to save me every time. I'm trying to slow down a little more on downhills anyway.

Use the "Weight of (Fully-dressed) Rider & Bike" section, and 45%-55% weight distribution.
For 235 pounds, 45-55%, 32mm tires, it calculates:
Front: 62 psi
Rear: 76 psi

Start around 65 front, 80 rear.

~~~~~~~~~~~
at about 195 pounds, rider+bike, 28mm tires, I get:
65 psi front, 80 psi rear.
I'm usually 70 psi front, 80-85 rear.

pdoege

I am 6'2" and 240lb and I run my Continental GP 5000 TL 700x32c at
F: 60 PSI
R: 70 PSI

I tried 50/60 for a while but I was bottoming the tires when I jumped curbs.

Jseivert

I tried 65 in the front and 75 in the back over 15 miles and there was a noticeable difference. I'm not too worried about fast downhills here in the midwest US. Most of ours are about the size of an overpass. I'll try knocking another 5psi off of each and see how that goes.

Thanks for the input!!

jpescatore

I weigh 230, moved to wider 32mm tires years ago and down to 80 PSI front and rear and I'm now using GP5000 tubefuls. The science says wider and lower pressure is just as fast if not faster on typical road surfaces at my average speeds and vs. velodrome floors or dynamometer rollers. I get way fewer flats at that pressure compared to the 90-95 I used to run - no pinch flats ever.

I can't really tell the ride difference between 80 and 90 PSI personally, plus my latest bike (2017 Trek Domane) has some elastomer built in where the seat post and the head tube meet the top tube that act as baby shock absorbers - those really clean up the typically road buzz. At my weight,neither those or the tires are going to absorb potholes or curb-break style bumps...