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Help for Wheel Lister #3466   BackToList   Print
Written: 2020.04.16   Review Date:2020.04.16    LastUpdate: 2020.05.14

1. Preface
2. Search Term
3. RimDiam
4. Position
5. Source

1. Preface
This is a help document. Each chapter matches one of the filters on the Wheel Lister.

2. Search Term
Use this to search for a specific wheel.

3. RimDiam
The rim diameter determines what size tires will fit. Terms like 700c, 26 inch, and 29 inch are often used to refer to wheel sizes. But they are misleading. None of them are accurate, because they are an approximation of the diameter of the wheel INCLUDING THE TIRE. That is a bad way to specify the rim size because the size changes just because you put a bigger tire on it. The ISO method of specifying rim sizes is based on the diameter of the rim at the point where the bead of the tire touches the rim. This is called the "bead set diameter" (BSD). A so called 700c is actually 622mm diameter. A so called 29 inch wheel is also 622mm. A BSD 622 tire will fit the rim on a hybrid bike, and also on a 29er"

The "bead" is the metal hoop part of the tire that presses against the rim when the tire is inflated. Note that this diameter is not the outer diameter of the tire. The terms 700c and 29ers are terms that refer to the outer diameter, not the BSD. What we used to call 700C is actually 622mm BSD. There are three sizes of wheels currently in the stores:


 Nominal Bead Set Common Use --------------------------------
  16" 305 mm folding bikes with small wheels, eg: Brompton
  20" 406 mm folding bikes with large wheels.
  26" 559 mm mountain bikes up to a couple of years ago
  27.5 584 mm some mountain bikes, wierd size
  700C 622 mm all road bikes, hybrids, and 29er mtn bikes
  29 inch 622 mm mountain bikes

4. Position
The position of the wheel, either Front or Rear. Both front and rear wheels often share the same rim, but have different hubs.

5. Source
This filter is mostly for the purposes of maintaining the data. In putting the data into the database, I painfully went through the online wheel lists from various stores. I put a code such as "WP" or MEC to indicate one possible source for this wheel. The same wheels turn up in many stores, because they are all using the same data feed. They are not maintaining the data, they are merely displaying the data that comes from the distributor. Eg: you'll see the same wheels from "The Wheel Shop" in many stores.

You can use the MfgPart (Manufacturers Part Number) to find the same wheel in different stores.