just finished installing a set of Vredestein Fortezza SE tires on a wheel set with Alex rim SUB's . Does anyone know the max air pressure this rim will withstand . Thanks in advance .

as much as the tires will hold

Citation needed.

Vredestein Fortezza SE tires = belly

Alex rim SUB's = beak

A wonderful bird the Pelican. It's beak can hold more than it's belly can.

So your saying it doesn't matter what the ri
m manufacture says is the
Maximum pressure the rims can withstand. Just inflate until u reach max on your pump . Don't most have a max that the rims can handle. The tires read 160 lbs max so ur saying the rims can withstand that much pressure ?

you could always contact alex rims to find out.

Don't mean to come across as a d**k but I tried and couldn't get an answer. Was just hoping some one had experience with that rim and an answer. I don't want to over inflate and be a danger to any one else that is all. Sorry to sound short. Track newb.

You are asking a legitimate question. I've had the same question. I emailed Velocity about my rims and I'm waiting for a response.

I'm moving this thread to Bicycle Mechanics from Track/Velodrome.

I'm not sure if you guys are aware, but some the Vredestein Fortezza tires are rated for up to 175PSI. Not your standard max 120PSI tire.

The Fortezza Special Edition is rated for 160PSI: See "Specs" here.

I use this very same tire.

Unfortunately there's no simple answer. The "hoop stress" on a rim, or the force spreading the tire flanges, is proportional to the tire's width times the pressure. At the same pressure a wider tire will stress the rim more than a narrower one.

Tim companies balance strength safety margin against weight in their designs. They're aware of what tire pressures are used, but must make an assumption about which tire will be mounted. Not speaking directly for these or any particular rims, but I'd expect the rims to have no problem with a 120psi tire in a width within the recommended range, or less than twice the rims width.

The folks who have problems are those who mount large section HP tires on narrow rims intended for racing.

Please let us all know if the answer is anything other than "much more than your tires." (in sincerity!)

If the tire says 250 lbs please dont put that, the tire will explode ok???

THat the tire can hold whatever doesnt mean you have to put that to the tire ok???

My email to Velocity:
I just got the response from the gentleman at Velocity:


So, that's the word from Velocity about their rims. This may or may not apply to other manufacturers.

Mavic recommended max tire pressure for their rims:
https://www.mavic.com/sites/default/f...echart_eng.pdf

There are more in the PDF (road/mtb/various sizes), but here are the basics for road:
19mm: 10 Bar / 146 PSI
23mm: 9.5 Bar / 138 PSI
25mm: 9 Bar / 131 PSI

yes contact mfr I have friend whodid tech for campy and olympic trials - says most rims aren't rated for vredistiein pressures
t/

You might want to read this. https://www.adventurecycling.org/res...SIRX_Heine.pdf

In my research, I basically found the same thing Carlton found - Velocity didn't really answer the question directly, and Mavic gave specifics, so I tend to use mavic's numbers as my benchmark.

Not surprised regarding velocity - in a positive way. In my track/cx experience, their stuff is bombproof.

This is probably the most practical response to date and I'm going to add another similar link: https://www.michelinbicycletire.com/m...rpressure.view


Couldn't find any PSI rating for the Alex SUB 700 rims, but AlexRims targets them for road bikes, trekking bikes, and hybrids so they should be expected to be capable of handling most tire pressures used by diciplines - typically up to 130PSI. At 600g the rims aren't super light, and they have a pinned joint rather than a welded joint, but none of that will have any affect in that PSI range.


This is a clincher rim and the highest PSI rating I've seen for a clincher tire is 160PSI. Which doesn't mean you have to run that. The highest recommended PSI posted by Michelin against a 180 lb rider was 116PSI.


So the question is - how much do you weigh and why is the question coming up AFTER the wheel-set has already been built?

I weight 180 lbs. And the question arose because of a change to the higher pressure tire , the wheel actually came stock on the bike. Also in my 48 years of cycling I have never used a tire with a max pressure that high. Hope that answers your question. Appreciate all the other info people were kind enough to research , answers a lot of questions---probably going to stay around 125-130 for now to be safe , or better yet 110-120.