Schwinn Tire Sizing

Left: Original Schwinn S-5 Right: Kenda Replacement

A commenter recently asked about where to find tires to fit a Schwinn Racer. This is a common enough question, so I thought I'd do a post about it. I should point out that I don't really know anything about tire sizes on other models of Schwinn, just the 3-speeds that supposedly take a 26 x 1 3/8" tire.

The thing is, a 26 x 1 3/8" English-size tire (or tyre, if you will) is not the same as a Schwinn-size 26 x 1 3/8" tire. I know, I know. Schwinn had a different rim/tire sizing system where rims were sized S-5, S-6, S-7 and so on. My 1961 Schwinn Racer, and other Schwinn three-speeds of similar vintage, came with either an S-5 or S-6 rim, which are the same size and will take the same tire/tube (the shape of the rim is slightly different, but does not affect the size).

The only tires that I could find on the market today in this size are made by Kenda, and they're not at all expensive. Harris Cyclery sells them online here. By the way, the I.S.O. (International Organization for Standarization) number for these is 37-597, which may help if you can get your local bike shop to order them for you. Cosmetically, they're a good match for the original tires (see above).

Clear as mud? For more on Schwinn tire sizing, see a lively discussion here. And, of course, Sheldon Brown weighed in on the topic here. Anyone with other (better) info should post it in the comments below. I just hope Kenda keeps making those tires.

How to Change a Tire/Tube

Since I've been doing quite a lot of this lately--what with my front tube blowing out a few weeks ago and just recently discovering (after I got everything put back together again) that the rim was just a teeny bit out of true--I thought I would post a how-to on this very helpful skill. Problem is, that only occurred to me after I'd already done everything, so I didn't take any pictures of the tire/tube changing process. So, instead, I post an excerpt and link to a very helpful article at BikeWebsite:


Let all remaining air out of the bicycle's tire.

First, try removing the bicycle's tire without the use of tools. Set the bicycle wheel on the floor with the valve at the three o'clock or nine o'clock position. Grab the top of the tire in one hand, and try to pull it sideways, over the top of the rim. With fat tire bicycles this is generally quite easy. With thin tire bicycles, you may find it nearly impossible.

If you cannot remove the tire without tools, use a couple of tire levers if you have them, or the backs of some forks or spoons. Try to avoid using sharp screwdrivers. Start by inserting one tire lever anywhere between the tire and the edge of the rim. Insert the lever just far enough to pry the edge of the tire over the edge of the rim.

It is very easy to poke a hole into the bicycles inner tube.

After prying the edge of the tire over, insert one more tire lever about four inches (10 cm) from the first one and pry a little more tire over the edge of the rim. Take out this second lever and re-insert it another four inches away and pry over the edge of the tire again here. Soon the whole side of the tire will be loose enough to finish prying over by hand.

Pull the inner tube out of the way and finish by prying the other side of the tire off the rim.

Read the rest of the article here.

I'm a Trend-Setter, I Guess

From the New York Times, via Paul Dorn's Bike Commute Tips Blog:

BICYCLE lovers, thrifty as well as trend conscious, are pulling neglected 10-speeds from storage and readying them for the road again. (Let the environmentally aware bragging rights begin.) These bicycles, made in the 1970s and 80s, used 27-inch wheels, which have been replaced with the smaller 700c wheels by road bike manufacturers. But a recent surge in sales of 27-inch tires suggests that the lowly steeds of yore are gaining new life as commuter bikes and weekend cruisers.

My 1970s Peugeot has 27-inch wheels. Whoopee, I'm cool. I don't look nearly as hip as these people, though.