TakingMyTime

My new Canyon Endurace came equipped with Conti 5000 S TR and running with tubes. Since I am not inclined to run tubeless I would like to continue running them with tubes. These tires are marked as maximum PSI of 72 which is just a little too low for me. Everything I'm reading states 72psi as the max. Since I will be running tubes in these tires does that give me any more wiggle room on the PSI since I won't be running them tubeless?

The other thing is that these things are incredibly difficult getting to seat properly (using tubes). I had one flat while on the road and I couldn't get it to seat properly. I actually road home with a pretty sketchy install. I then made 2 attempts (while at home in my garage) to get them installed properly and I just gave up. I currently have a set of 5000s (clinchers) and I'm just afraid to go through all the hassle of trying to get the TR tires back on there. I've never had such an ordeal installing tires as I did with the tubeless version.

FBinNY 

Sorry, but no.

Tubes have no effect on structure. To get a sense of why, try inflating a tube outside of a tire, and you'll find max pressure of less than 5psi.

That said, there is some wiggle room on max pressure. Manufactured products vary including tires. The rated max is low enough that the worst example would be OK. So if you didn't draw the shortest straw, you're OK to push things a bit.

However, the stress the tire imposes on rim flanges is proportional to pressure X width, so wide HP tires are hard on rims.

If you're open to it, there are various charts about tire width and pressure based on axle weight.

Yan 

Hooked or hookless rims?

TakingMyTime

Hooked. The stock rims that came with the bike.

TakingMyTime

Thanks, I just hate seeing this great set of tires just sitting there.

Bradleykd

What size tire? My 28mm GP5000s TR says 70 something psi for hookless, 94psi for hooked rims. I would thing there are two different acceptable pressures

zandoval 

Over the past few years I have noticed I have difficulty properly mounting my bicycle tires. I thought for sure it was me just getting old and weak. But it would appear that others are having the same problem... Ha

I am not old and weak... Nope... Not Me...

Steve B.

I run my 5000’s on hooked clincher rims with tubes at 110 on the rear, 105 front. Too little air at my weight and I pinch flat. I pretty much have never paid attention to what a manufacturer puts on a tire for max pressure. I used to run as high as 120, then slowly experimented with lower pressures.

TakingMyTime

30 front, 32 rear. I've looked into this and everything I'm seeing states 72 psi max for these widths.

FBinNY 

This reflects two criteria. The higher is based on the tires internal structure, and the second to the bead's loss of holding strength on a non-hooked rim.

Bradleykd

I fully understand.

The wider tire should take less PSI to provide the appropriate support, which is why width is important in this scenario.

I guess the 30 and 32mm tires are maxed at 72psi, but I'll agree with the OP that it seems low for a hooked rim installation.

Bradleykd

Stating what pressure you run is irrelevant without knowing width of the tire, rim, and if it is hookless, hooked, and tubeless or not.

Bradleykd

What wheels came on it?

Steve B.

Good points. They were 25mm 5000’s, on Mavic CXP33, older road rims, maybe 19mm wide ?. Didn’t pay much attention. Older so your basic hooked clinchers from 10 years ago, I had never heard of hookless back then.

Bradleykd

Yeah, so you weren't far off base there. The max pressure for a 25 is listed at 109psi. That's for a TR tire though, idk if it's different for a standard clincher gp5000s

Aubergine 

I understand that with the advent of tubeless tires, the rims and tires must now be manufactured to tighter tolerances so that the combination will actually hold air. Most of my old bikes run old wheels, and it's no problem to ease modern tires on the older rims. But my most recent new rims (tubeless ready Pacenti Brevets) are a bear.

13ollocks

I'd be amazed if CXP33's are even 15mm internal width - these are old (but good) rims, from before the adoption of wide rims/tires

yannisg

I have the same bike and tires as you have.
I have been using tubeless since 2012 due to racing and long Brevets. Since I don't race anymore, and have limited the brevets to 200k I decided to return to tubes, and avoid a few tubeless hassles (cleanup and sealing problems on the new wheels.
I am using a latex tube in the rear and an aerofan in front 68-70 psi (30mm) front and 70-72 psi (32mm) rear. Hooked rims.

akoubik

Tubes or tubless doesn't change anything on tire max pressure. I know people give tubless magic powers but unless you are in Arizona gravel the benefits with new super light tubes are so small it is not worth the messy hassle. Larger tire = lower pressure. After 19 mm 120 PSI tires we (the research) found that pressure is not really that relevant to rolling resistance in real world. In fact wider with lower pressure are better. Why do you think 72 psi is low for you?

Barry2 

For the Continental GP 5000 S TR 25-622 700c x 25mm

The 73 PSI limit is for all sizes of HOOKLESS Rims.

Running 25-622 HOOKED Rims the limit is 109 PSI

FYI That 109 PSI tire limit is far above the limit on my Carbon Wheels.

So what tires are you running if you are seeing a 72 PSI Limit. ??

Barry

FBinNY 

Low for a tire that narrow even on a straight side (Endrich, hookless, or whatever you call it) rim.

Almost 50 years ago (70's) IRC was producing 95psi. 32mm tires for straight side rims.

TakingMyTime

To help clear things up.
These are Conti 5000 S TR in 32mm and 30mm. Continental's website states the Max PSI for these sizes is 72 psi on a hooked rim. I weigh about 185 lbs. My objective was to run these around 80-82psi and I was hoping someone here might have had some experience doing what I was hoping to accomplish. I would run these with tubes and hope to raise the "max" psi given on the tire and Conti's website... that's all.

surak

Strange, I've never had an issue seating the S TR in 28mm and 32mm. Both your front and rear are difficult to seat? Have you tried any other tires on those wheels (which wheels are they)?

You could try wetting the tire bead to give it a bit more lubrication to move out of the rim well. And it's generally not a problem to temporarily overinflate a tire on a hooked rim to get it to seat, although getting that high of a pressure with a minipump roadside could be difficult.

bboy314

The OP stated above they’re using a 30 and 32mm tire, so the chart you posted shows the 73 psi limit.

Aubergine 

While I was out riding today I had a thought, TakingMyTime . I wondered if your pump's gauge was accurate? If it is off, that may explain why you're having difficulties.