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Speed Bicycle Hub
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Featured Article:
Understanding Bicycle Rims
The Bicycle Rim is definitely one of the most important part on the bicycle wheel. People often had mistaken the whole wheel. consisting of rim and spokes as the "rim". but actually rim is defined as the metal circle which holds both the tube and the tire. Each wheel of the wheel set consists of several spokes which are used to connect the rim to the main hub (i.e. the center of the wheel consisting of the axle and the bearings).
Types of Rim
Rims come in various size and shapes. depending upon the underlying tire. If the traditional tubular tires (these have inner tube sewn into the tire allowing the tire to be inflated without being mounted on a rim) are being employed. the tire needs to be glued to the rim. Although they are expensive and difficult to maintain. yet they provide excellent speed and often the preferred choice when it comes to racing. The other set of tires are the clincher tires (these enclose an inner tube to hold pressurized air). They can be repaired easily and the performance is also at par with the tubular tires. As both these tires are widely used. most manufacturers prefer to produce rim fittings for both sets.
Building a Bicycle Rim
In the beginning. wooden rims were used. which were later replaced with rims made of steel. The problem with steel is that it is heavy and if the rim gets damaged. it is really difficult to mould it back. These were later replaced by alloyed rims (including aluminum). Alloyed rims can be molded in any profile. but not too deep. as that will increase the weight too much. These provide lightless and beauty to the bicycle rim. The latest trend to hit the market is the carbon fiber rim. These are very light and quite strong. but then they hurt the pocket a lot more. The carbon fiber rims don't brake well in damp situations. Thus. special brakes that can block carbon are required and these are again expensive. For the carbon rims to work. the rim needs to perfectly circular with no bulging.
About the Author
Alastair Hamilton is an online entrepreneur and writes for http://www.bikecyclingreviews.com .A focused website that offers the best articles on wheels and frames and bicycle wheels , read more at
bicycle rims
What Tools/Parts do I need to convert my 15-speed bicycle to a Fixed/Single-speed with a flip flop hub?
what do I need to buy to convert the two, I've searched around but have only seen showing how to convert to either a Fixed Gear or Single-speed rather than a flip flop hub allowing me to change between the two. Please!
1. What tools/parts do I need to buy?
2. How do I do it?!
I'll tackle this one 
Well, it is going to be a bit tough to do what you want primarily because of the rear hub. Let me explain...
First, 5 speed hubs such as the one you have are largely obsolete. This means that it will be VERY unlikely that you'll find a hub (if you are willing to rebuild the wheel) that will have both sides threaded which is what you'll need to do a flip-flop. You MIGHT be able to find a BMX flip flop hub with threads on both sides.
There is the possibility to update your bike to have an 8 or 9 speed hub which would give you a freehub on one side and threads on the other to mount the fixie, these are quite expensive, perhaps $200 for the hub. The problem here is that you probably have 27" rims which are also obsolete so a custom built wheel will be a requirement... building the wheel using your old rim. Figure $60 or so plus spokes for that.
So, here is what you'll need IF you want to do the upgrade:
- a flip flop hub with freehub on one side and threaded on the other;
- a single speed freewheel with appropriate spacers and an appropriate cassette (to replace your existing freewheel);
- a new chain
- new shifters (if you want to keep the multiple gears);
- new front and rear derailleurs (again, if you want to keep the gears);
- new crankset (sprockets are too wide to handle the new chain);
You'll also need to have the frame spacing reset since the new hub is wider than the old one. This is something you can't do at home.
For tools, you'll need a freewheel remover, a chain tool, the appropriate wrenches to remove/replace various parts (mostly screwdrivers and metric hex keys), and possibly some dedicated crank tools such as a puller.
Doing a quick estimate of just the parts to accomplish this, assuming you can use a BMX hub with threads on both sides, will be in the neighborhood of $500 plus labor. Worst case if you decide to go to 8 or 9 speed would be over $1000.
Not what you wanted to hear, I know. Sorry.
Mixed signals on high-speed rail in Raleigh
The N.C. Department of Transportation is accepting public comment through Aug. 30 on the high-speed rail project.
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