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A shotgun blast behind me? Nope. Just an exploding inner tube.

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Hot and Cold Temps have alot to do with air pressure in tires. My dragster slicks air pressure will rise from 4lbs to 15lbs just sitting in the sun so you have to cover them and check the pressure all the time.
We never had those problems back in the good old days of the last century. I'm thinking it's an inner tube material difference. Maybe EPA made them use different rubber formula.

I need glasses. That's dragster, not daughter. Yeah, that's a lot of black heat absorbing stuff. Anyway, back in the good old days bicycle inner tubes did not blow up just sitting in the sun and would hold decent if not perfect pressure for months.
 
Here's an example of the significance of Bead Seat Diameters. I've got an old Sherwood Flyer 3-speed (basically a Raleigh Sport clone) that I've been slowly rebuilding over the past couple of years (I have nowhere near the amount of spare time that I thought I did), and it was in need of replacements for the ratty original blackwall tires. I grew up with Schwinns, but I noticed the old 26" x 1 3/8" tires had extra verbiage on the sidewalls beyond just the nominal size:

20250104_114549r.jpg


"FITS 26 x 1 3/8 ENGLISH EA-3 RIM ONLY"

Per Sheldon Brown's website, an excerpt from his tire sizing table (here) shows that EA-3 has a slightly smaller BSD than the Schwinn equivalent: 590 instead of 597:

Tire_Size_BSDs.jpg


Thus informed, a lengthy ransack through a pile of Kenda 26" gumwalls at Blue Moon Bikes (Sycamore, IL) finally turned up precisely two 590 BSD tires amidst a sea of slightly larger 597s:

20250104_120203r.jpg


So I'm confident that these tires will do just fine. Had I not noticed the markings on the old tires, I might have gotten 597s instead and marveled at how easy they were to mount, but that might lead to failure later on. One other detail I notice on these new tires is that their recommended pressure is only 55 PSI. Seems a bit low, but I'll stick to that.
 
54psi seems high for a balloner. I guess if it’s rated at that then let er’ rip. I generally go between 30-40. Glad you and your bike went unscathed!
 
Yes, as we said on Dec. 31.

I just went outside to double-check the rating on the 26 x 2.125 Seyoun NJK tire. It's 40 to 65.

Now, the tire's at 44 psi.

But maybe I'm safer to lower the pressure even more, somewhere in the 30s . . . regardless of what the manufacturer says.

20250104_142406.jpg
 
Lowering the pressure even more is going to lead to more tire squirm on the rim, as well as a dramatic increase in pedaling effort; that's not the direction I think you want to go here. Is this the same tire on the same rim that let go the first time?
 
Lowering the pressure even more is going to lead to more tire squirm on the rim, as well as a dramatic increase in pedaling effort; that's not the direction I think you want to go here. Is this the same tire on the same rim that let go the first time?
Agreed!
 
I learned not to ride with original tires and tubes any farther than you want to walk...
 
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