I have run into this same problem before with several 27" vintage rims. I found that using a smaller tube (i.e., 20-23 mm wide) with 27 x 1 1/4" tires allowed me to inflate the tire with perhaps 10 to 20 psi greater pressure that the standard tube. As an example an old set of Michelins would pop off of Conloy ASPs at about 75 psi...I swapped the tubes for narrower ones and now can safely inflate them to 90-95 psi.
Paul Raley
Expected to be 60 deg (!!) in Leonardtown MD
"Raoul Delmare" <R.Delmare@Charter.net> wrote:
>Hi ,
>
> Had a wonderful time ( 18 months ago - could it have been that long ago
>? ) with my brand-new-to-me , great-looking , 1973 Schwinn P10 Deluxe
>Touring 10-Speed . Before I bought it , the bicycle had just been
>overhauled & tuned-up . Which explained why it wouldn't shift properly ,
>etc . Minor adjustments were fun to do .
>
> The seller had been extremely careful to be extremely honest about nicks &
>scratches & cheap tires , etc . It looked fabulous to me . But the
>brand-new tires , inner tubes , & rim strips , really were cheap-cheap
>modern 27 x 1 & 1/4 inch .
>
> The rims were ( & still are ) the correct original Weinmanns . Are
>these the same as the "Alesa" model rims that Hilary Stone is selling
>right now ?
>
> These rims are easy to identify at a glance . When looking at them with
>tires mounted & ready to ride , the exterior of the rim , toward the
>spokes ( the inner part of the exterior , if you know what I mean ) , has
>a bump at each spoke nipple , and what I'll call very small shoulders where
>the sidewalls of the rim begin . Some people would say that these rims have
>dimples & shoulders . Actually I think that they are quite elegant looking
>, once you get used to them .
>
> The point - These rims are NOT "hook bead" rims . These rims are
>NOT "straight side" rims . These rims actually flair-out just a little
>bit ! They allow the tire to slip off rather easily .
>
>( ever blow a tire off of a 20" plastic "Tuff-Wheel" ?? but that's
>another story )
>
> I played with my new bicycle all evening , and well into the night . By
>the time I got around to putting air into the tires , I'd forgotten what I
>knew about those rims . The cheap tires had something surprisingly large
>written on their sidewalls , like maybe 105 p.s.i . I can't remember
>what I put in them , but I had sense enough to check that the beads were
>evenly seated , before I put 5 more p.s.i. into the rear than into the
>front . I hopped on , to ride around in the basement . I was just
>checking saddle height . There was the strangest creaking noise , like the
>tightening of old ropes on an old sailing vessel . Hmmmmm . . . What
>was that interesting sound ? BOOM!!!!
>
> I knew better , and yet I still did it .
>
> Some while later , I fitted that bicycle with wonderful new Panaracer
>Pasela 27-inch x 32mm tires , & new top-quality rim strips , and new
>inner tubes ( o.k. , so the new tubes were still cheap ones ) . I took it
>along on a long automobile trip , which included a lovely group bicycle
>ride , in the hills East of Dallas , Texas . Everything was great ,
>until I arrived home again , days later . I arrived late at night , and
>only pulled a few essentials out of the car . The next day the bicycle sat
>in the parked car , on a mild and comfortable Summer day , with the
>windows closed , in the sun . That evening , I unpacked everything
>including the bicycle .
>
> I had put something like 85 p.s.i. into the front , and 90 p.s.i.
>into the rear . In the oven-heat from the sunshine , the rear had blown
>off .
>
> I always knew that you were not supposed to put more than about 85 p.s.i.
>into anything mounted on those rims .
>
> They are wide rims , with slightly flared sidewalls , that don't hold
>all that much pressure . So , buy wide tires . My 32mm Paselas are
>top-quality , with Kevlar beads , and no belts . So , these tires are
>wide , light-weight , and flexible . And yes , as I've mentioned before
>, in a group of well equipped tourists , I was out-coasting everybody
>else - very much ! ( Love those 1973 Campy Record hubs too ! )
>
> Those rims are just like those wonderful & inexpensive ( "cheap &
>cheerful" ) 1977 Hutchinson SuperSprint sew-up tires that I loved .
>
> They work perfectly at 80 to 85 p.s.i .
>
> Don't push your luck .
>
> Be happy .
>
> : - )
>
> Raoul Delmare
> Marysville Kansas
>
>----- Original Message -----
>From: Steve Maas
>Cc: Classicrendezvous
>Sent: Wednesday, January 08, 2003 11:14 PM
>Subject: Re: [CR]Chuck's Pasadena ride
>
>
>> Yes, I confess, it was my Carlton that blew a tire right outside the
>> parking lot at the beginning of the ride. I reached into my pack for my
>> mini-tool, necessary to remove the wheel nuts, and discovered that I'd
>> forgotten it. So, I sheepishly told everyone else to go on, tucked my
>> tail between my legs, and shuffled back to my car. I saw the whole crew
>> glide across Fair Oaks Avenue as I waited for a traffic light on my way
>> home, the humiliated Carlton hanging on my bike rack. Sigh. Maybe next
>> month...
>>
>> Today a remarkable thing happened. I drove south to Carlsbad to pick up
>> yet another bike I bought on Ebay, an early 50's Olmo with the old,
>> single-jockeywheel Campagnolo rear derailleur (I forget what it's
>> called) and suicide shifter in front. Part of my search for a bike
>> that's almost as old as I am. It was at Pacific Coast Cycles on
>> Roosevelt St. in Carlsbad, and, wow, is that a great shop! The owner,
>> Chuck Hoefer, is extraordinarily friendly and helpful, and the shop is
>> full of wonderful old bikes and parts. The kind of place that has a
>> whole wall of tiny, mismatched plastic drawers, each loaded with small
>> parts. Exactly the opposite of the squeaky-clean, modern shop filled
>> with clothes and mountain bikes. One of his bikes was a mid-70s Cinelli,
>> all Super Record, and I came soooo close to asking the price. Only the
>> image of my wife waiting at home with a new cast-iron skillet stopped me.
>>
>> Anyway, I mentioned that my current project in a late 50s Allegro, and
>> Chuck started to tell me the story of a local person who had one. Hmmm,
>> interesting; the original owner of my bike lived in Carlsbad or
>> Oceanside, the next town north along the coast. The bike was stolen
>> once, and he just happened to see someone riding it as he was
>> test-riding a new tandem. He followed the culprit, got his address, and
>> reported it to the owner. The owner called the police, and the bike was
>> recovered. We started comparing notes, and it became obvious that it was
>> my bike (unless there were two red 59-cm Allegros without decals and a
>> thick, gunky paint job in Carlsbad, California at the same time.)
>>
>> On the way out with my "new" Olmo, I noticed that Chuck had quite a nice
>> selection of 27" tires, so I bought a new pair of Continentals to
>> replace the cheapo tires on the Carlton. The old rims on the Carlton do
>> not hook the bead, like modern ones, so the tire can slip off the rim,
>> causing a blowout. Perhaps the better tires, with stronger bead wires,
>> will help. (Anyone have another suggestion?)
>>
>> Afterward, I took a pleasant ride south along the coast, turning around
>> just north of La Jolla. Not on the Carlton though; it's sulking in the
>> garage with its wheels off.
>>
>>
>> Steve Maas
>> Long Beach, California, USA
>>
>> _______________________________________________
>
>
>
>
>
>_______________________________________________
>
__________________________________________________________________
The NEW Netscape 7.0 browser is now available. Upgrade now! http://channels.netscape.com/
Get your own FREE, personal Netscape Mail account today at http://webmail.netscape.com/