i need some who is very professional on bicycle rims andthis question to 27 years in bicycle rims and car rims

6 Comments

1. mirageguitarworks says:

   April 28, 2010 at 7:42 am

   1) The reason you do not get a good answer is because there is no standard for hub diameters.

   Here are the standard WIDTHS for hubs:

   91 mm Low-end front hubs.
   96 mm Older front hubs, especially French.
   100 mm Modern front hubs.
   110 mm Rear older track, coaster brake and other single-speed hubs. Also, front hubs for Downhill bikes with 20 mm axles.
   114 mm Rear 3-4-speed .
   120 mm Rear 5-speed, Ultra 6, newer track hubs.
   126 mm Rear 6- and 7-speed (road).
   130 mm Rear 7-speed (MTB) and 8- 9- and 10-speed (road).
   135 mm Rear 7- 8- and 9-speed (MTB)
   140 mm Rear tandem.
   145 mm Rear tandem (newer models.)
   150 mm Retro-Choppers, some Downhill and Freeride models.
   160 mm Rear tandem (new Santana proposed standard.)

   Overall axle length for quick release hubs is commonly 11 mm longer than the over-lock-nut distance listed, 5.5 mm on each side.

   2) There is no “Best” company for hubs. Each company has their own strong points and weak points. If you do design then you understand the great difference in quality of bearing surfaces, types of bearings, bearing count, and other things that make a big difference in performance. This extends into materials suitability and other things required of the designer. You usually do not get high quality for low cost.

   3) FEA is an engineering process that has little to do with quality. Most items that are sold in the U.S. must be CPSC approved or at least follow CPSC guidelines. It will be your job to determine the correct testing and approval procedures for your product.

   4) As with all other things, this is up to the designer.

   5) If you mean the axle in this question, this varies depending on the use. Axles vary from about 6mm diameter to about 14mm diameter. If you mean the overall diameter of the hub, there is no standard.

   6. Stainless balls will last longer, ceramic balls are smoother but don’t last as long.

   7. Most high quality wheels use quick release axles. A quick release axle is a tube. Tubes are usually stronger than the same size and material rod. A quick release mechanism includes a freely moving rod THROUGH a tube. Very strong and light.

   With all due respect, I think you will need some experience in materials suitability, fluid dynamics, and some good geometry courses before you try and design a bicycle hub. It would also help if you had some hubs to look at.
2. MTBIKR says:

   April 28, 2010 at 8:32 am

   To continue on what mirage posted, you said you wanted to design your own “car rims”. If these will ever see any highway use there are safety standards you must comply with. You can get the standards from several sources but the easiest is to go to “Sema.org”. They can get you the spec’s to comply with and how to get your rims certified for road use.
   As for the bike parts try to get the following standards
   ISO 5775, ISO 8090 and ISO 4210.
   If you are using ACAD there are modules you can get to help with the stress analysis.
3. madmac13 says:

   April 28, 2010 at 9:22 am

   got it, your doung cadd work. cool. from both a mechanical and cycling stand point bicycle rims and automotive rims are two entirely different animals. automotve rims are generaly machined out of a single piece of metal, or if multiple pieces are used they are secured so as not to move independantly of the wheel as a whole( spinners dont count). bicycle wheels how ever house the bearings. they contain parts that are designed to move independently, though complimentary of the wheel..
   the questions you have asked (this time and last week as well) are questions that have many multiple answers depending on the type of bicycle you are riding.
   i urge you to chose between bicycle or automotive rims and if the choice is bicycle to determine what type of rim you would like to create.