Re: [CR] 650b Tire/Rim Fit "Issues"

Example: Framebuilding:Restoration
From: "ternst" <>
To: <>, Rendezvous Classic <>
References: <>
Date: Fri, 1 May 2009 19:03:53 -0700
Subject: Re: [CR] 650b Tire/Rim Fit "Issues"

Many tires may fit :snug" and have a low spot when the bead doesn't want to position itself correctly. While working as an inspector a the old chicago schwinn plant in the '50's, the assmbly line wheel & tire men had a brush and bottle of soap water which was very slippery when applied to the rim and the tire pressed over. When the hose pressure was applied, the tire almost always popped into place and rapid piece work was posible. We used liquid detergent in our shop and inflated tire with soap beteeen tire and rim so the obstreperous spot would assume the position sometimes with pressure alone or maybe the tire plier or giving it the 'ol palm and finger treatment. Give mit a shmier and sqveeze, baby, and zee vot happins! Every once in a while the guys wouldn't watch the bead and if it wasn't in the rim it would blowup, and off so fast with a loud boom or po!! Then the whole damn area would be full of the inside tube talcum powder, if you were too close you could speak but not hear for a minute or so and everyone within a yard or two would be full of tacum dust! Were we having fun or what?
Ted Ernst
Palos Verdes Estates

----- Original Message -----
From: sandranian
To: Rendezvous Classic
Sent: Friday, May 01, 2009 3:24 PM
Subject: [CR] 650b Tire/Rim Fit "Issues"

I just purchased a c1960 Gitane with 650b wheels/rims. I replaced the tires, purchasing (from Harris Cyclery) a pair of new Panaracer 650b tires. However, they don't seem to set right in the rims, specially the rear (I don't think the front rim is a problem). The rear rim is a steel Rigida 650b rim (at least that's what's stamped into it). The problem is that the bead of the tire doesn't seem to want to fit all the way around: It almost appears a bit small for the wheel. What is the problem here? What is the fix? Can I "stretch" the bead at all?

It all appears to be right, but just doesn't fit that way, even when inflated, it creates a "bump" (low) in the tire, but the rim is true (no hops).

Stephan Andranian
Costa Mesa, California USA