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Old 01-07-13, 10:23 PM   #1
lostforawhile
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reccomended pressure for vintage weinmann wheels with Kenda high pressure tires

I was wondering what would be a safe pressure for my vintage Weinmann wheels with kenda tires? These would be identical to what would have been on my supersport new in 71, the tires say 90 PSI rated, but I was under the impression that some early wheels cant handle that, I was going to take them to work with me tomorrow and fill them with the nitrogen tank. The Kenda look really good on these rims by the way, gumwalls of course, I would have gotten more expensive tires, but we have lots of road debris here, such as nails screws etc
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Old 01-07-13, 10:44 PM   #2
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I don't go over 70-75 PSI on my old Super Sports with the Weinmann rims - switched from Kendas to Pasela TGs but still keep it low. Blew off several before I learned...
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Old 01-07-13, 11:00 PM   #3
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It s the hook or lack thereof in the rim section that will probably keep you under 80 psi. I would have thrown out 70 psi as a probable safe amount.
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Old 01-07-13, 11:02 PM   #4
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I'll go 70, I wonder what the Schwinn puff "high pressure" road racer tire was supposed to get? thats what was originally on mine, and is still on the original back rim lol
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Old 01-08-13, 12:14 AM   #5
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The one thing that can raise the pressure rating of the rim is to elevate the inside floor of the rim slightly, right where it meets the sidewall.

The inside shape of many single-wall rims complicates this, but I have been able to trim the widest Velox rim tape to a precise width that allowed me to lay it within the SuperSport's Weinmann rim in true, wall-to-wall fashion, which raised the blowoff pressure by at least 15psi.
The Weinmann rim on the rear wheel was curiously the more under-sized one, and the similar front Weinmann rim takes the 80psi just fine.
I'm now running 80+psi in the rear tire, and both tires are 1-1/8" sized, wire-bead tires.

I had tried at least 5 different tires on the rear rim trying to find one that would would hold 80psi, but all had the bead immediately creeping up whenever the pressure went from 70 to 75psi.
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Old 01-08-13, 12:44 AM   #6
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Optimal tire inflation depends on the thickness of the tire and the load. So to answer your question we would need to know your tire thickness, your weight (including the bike) and how it is distributed for and aft. Lacking this I'd say if you have old Weinmann 27" rims and 32mm tires you don't need to inflate above 70 psi in the rear, less in front.
Somewhere on the internet is a chart that shows how much pressure you need depending on width and load. I have it saved on another computer, can't find it now.

Last edited by rhm; 01-08-13 at 12:48 AM.
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Old 01-08-13, 02:56 AM   #7
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Quote:
Originally Posted by lostforawhile View Post
I'll go 70, I wonder what the Schwinn puff "high pressure" road racer tire was supposed to get? thats what was originally on mine, and is still on the original back rim lol
The Schwinn Puff Road Racers were/are rated for 75. That's also what Sheldon Brown says is optimal for a 32mm/1-1/4 tire for a 100 lb per tire load: http://sheldonbrown.com/tires.html#pressure

Purely anecdotal but I've run as high as 85 on steel rims and never had any issues.
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Old 01-08-13, 03:12 AM   #8
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reccomended pressure for vintage weinmann wheels with Kenda high pressure tires

I'm running 25-630 tires on my Norman and have pumped the rear tire up to 90 PSI and ridden the bike very aggressively without any issues. I ride the front around 80 PSI. The rims are Dunlop Special Lightweights.
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Old 01-08-13, 04:31 AM   #9
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Hey, I'll swap you a close-to-new condition Weinmann 27" clincher rim on a similar condition low-flange Maillard hub, for a 27" Super Champion Competition clincher rim with the blue label (36-hole)? Obviously, this was essentially a joke, unless you actually have one. I have that Super rim on the rear, with a high-flange Normandy hub in good condition, and just aquired the matching front high-flange hub. I figured if I need to build a wheel anyways, I should try to match up to the rear. Which would make that Weinmann un-necessary.
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Old 01-08-13, 07:17 AM   #10
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reccomended pressure for vintage weinmann wheels with Kenda high pressure tires

Hmm. I have old Weinmann rims on a couple bikes and inflate them to 85-95psi, with Pasela tires. No problems.
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Old 01-08-13, 07:38 AM   #11
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Quote:
Originally Posted by big chainring View Post
Hmm. I have old Weinmann rims on a couple bikes and inflate them to 85-95psi, with Pasela tires. No problems.
I've run them high as well. Its critical to get the bead evenly seated.

My two bad experiences were with folding tires (oops), and another that I did not seat perfectly.

Back in college (mid 1970s), I ran 100psi on a set of 27 inch Araya unhooked rims, with really narrow Michelin Elan tires.

Last edited by wrk101; 01-08-13 at 11:34 AM.
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Old 01-08-13, 08:23 AM   #12
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So, the Kenda tan-walls work OK then.... just wondering for my Torpado build up...I'm afraid that a pair of Paselas cost as much as I paid for the bike! Vintage Weinmann's, HF French Hubs. Just have to watch the pressure and bead seating.
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Old 01-08-13, 09:07 AM   #13
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Quote:
Originally Posted by big chainring View Post
Hmm. I have old Weinmann rims on a couple bikes and inflate them to 85-95psi, with Pasela tires. No problems.
I used to do that, too, until I blew off a Pasela at about 90 lbs. Now I keep them at 80.
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Old 01-08-13, 09:55 AM   #14
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Its all about the rim sidewall. Vertical hook beads sidewalls can take any pressure. Less vertical non-hook beads can go to around 75 regardless of the tire.

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Old 01-08-13, 10:55 AM   #15
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Its all about the rim sidewall. Vertical hook beads sidewalls can take any pressure. Less vertical non-hook beads can go to around 75 regardless of the tire.

+1
Some rims with higher flanges can take more.
I've dealt with 74ish Araya steel rims that would handle 90 PSI, but talk about a pain to mount/dismount tires.
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Old 01-08-13, 12:35 PM   #16
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Make sure you use wire-beaded tires with non-hooked rims, and keep the pressures down as recommended above.
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