Top Document: Rec.Bicycles Frequently Asked Questions Posting Part 3/5 Previous Document: 8c.7 Wheel Bearing adjustment Next Document: 8d Tech Chains See reader questions & answers on this topic! - Help others by sharing your knowledge Date: Fri, 25 Jul 2003 00:08:48 -0700 Some heavy riders get poor service from mainstream wheels. Common durability problems include wheels that go out of true and broken spokes. Common strength problems include wheel collapse broken rear axles, and broken ratchet mechanism. A ``better'' wheel improves durability and/or strength. Variations in wheel use and budget make it hard to make general recommendations. However, here are some things that can help build a stronger or more durable wheel: - A stiffer rim improves wheel strength and spoke durability by sharing the load among more spokes. Rim stiffness is increased by using a wider rim and is also improved by using a deeper rim. It is clear that a wider rim will build a stronger wheel; however, a deep rim is radially stiffer, which shares the load among more spokes and thus makes the wheel laterally stronger. Thus, using a deep-section rim can improve lateral wheel strength and spoke lifetime, and can also reduce the frequency of wheel re-truing. - All other things equal, a heavy rim is stronger. It is also stiffer, and rim stiffness improves wheel strength. However, rim shape has a dramatic effect on stiffness, and many heavy rims do not have a good shape for building strong or durable wheels. In particular, many heavy rims are not very deep. For many uses, a lighter deep-section rim builds a better wheel than a heavier but shallow rim. - For ``dished'' wheels, use a rim with offset spoke holes. The rim should face so the holes are as close as possible to being centered between the flanges. Although offset rims move the nipple position only a few millimetres, with highly dished wheels the change is a substantial percentage of the dish. Reduced dish improves spoke bracing angles which improves wheel strength; allows higher tension on the low-tension spokes which reduces the rate of re-truing; and may allow higher overall spoke tension, which improves wheel strength. - On front wheels, use hubs with wide flange spacing. Wide-spaced flanges may be as much as 1cm wider than standard flange spacing, and some aerodynamic hubs space the flanges as much as 1cm closer together than standard hubs. Wider flange spacing improves the spoke bracing angle and thus improves lateral wheel strength. It may also reduce the rate at which wheels need to be re-trued. - Center the rear hub by using a narrow sprocket cluster. Wide clusters use space on the right and thus push the flanges to the left; such asymmetry is called ``dish''. Dish hurt the bracing angle of the spokes coming from the flange which is closer to the center line. Dish also forces different left and right spoke tension. The spokes with lower tension are more likely to go slack under load, which weakens the wheel and make truing more frequent. The spokes with higher tension may pull the nipples through the rim before the rim's compressive load strength is reached, thus limiting overall spoke tension for the wheel. Reduced overall spoke tension further weakens the wheel and makes retruing yet more frequent. Narrower clusters reduce dish. As of 2003, Five-sprocket and narrow six clusters are largely unavailable. 6-sprocket and narrow seven clusters are available, but mostly in lower-priced products. Some are good products, but some may be less durable. Eight and nine-sprocket clusters use the same spacing; they get nine in the same space by using thinner material for the sprockets and chain. Nine-speed equipment has a reputation for breaking and may be unsuitable for riders who already have component durability problems. It is sometimes possible to build a 7-speed hub by bolting a replacement 7-speed body on to a new 8-speed hub. Some people retrofit 8 out of 9 sprockets of a 9-speed on to a 7-speed freehub body; but doing so may cause poor reliability due to the thinner sprockets and chains. - Center the rear hub by using a wider dropout spacing. Centering has the benefits listed above. Common dropout spacings range from 120mm to 135mm and some tandems use 140mm and winder. If you have the luxury to select the frame, get a wider spacing, but beware of possible heel clearance and crank width issues with wider spacing. If you have a steel frame it may be possible to spread the stays by 5mm. Beware that spreading requires special tools and skills to avoid frame damage. Aluminum, titainum, and carbon frames cannot typically be spread without damage. Note that simply ``stretching'' the frame to fit over a wider hub may cause gradual frame damage. Spreading the frame requires a longer hub axle. Many hubs are offered in various widths but make sure you have the right parts in hand when the frame is spread. - Use a rear hub with a tandem-rated ratchet mechanism. Many ``racing'' quality hubs are designed for low weight and are no stronger -- and are sometimes weaker -- than mainstream components. - Use a rear hub with an oversize axle. Freewheel hubs are available with steel axles of 17mm. Freehubs are available in two general styles, see the FAQ ``Cassette or Freewheel Hubs'' section. The type labeled Hugi/Campagnolo needs a much larger axle; the type labeled Shimano/SunTour does not need as large an axle. Most modern (2003) freehubs have adequate axles even for heavy riders, but some older ones are inadequate and new designs often bring new weaknesses. - Use a large number of spokes. Most sizes of wheels can be built up to 48 spokes. Note that there is less selection in high-spoke-count hubs and rims, and parts often cost more. The benefit of many spokes is partly limited by the rim strength: a large number of spokes may require lower tension on each spoke to avoid collapsing the rim. Thus, a very strong rim is required to realize the full benefit of using many spokes. - Use high spoke tension. High spoke tension improves radial and lateral wheel strength, improves spoke durability, and reduces the rate at which spokes loosen and let the wheel go out of true. Maximum spoke tension varies from rim to rim and, unfortunately, makers do not typically publish a recommended tension. As of 2003, I have seen only one rim which listed spoke tension. Thus, tension must be discovered in the manner described in _The Bicycle Wheel_ [Brandt]. Although this procedure allows you to set tension for a given rim, it is done as part of building the wheel, which keeps you from choosing rims based on strength. - Stress-relieve the spokes. Spokes are prone to break unless they are stress-relieved after wheel building. Stress-relieving is described in _The Bicycle Wheel_ [Brandt]. Stress relieving is also summarized in the wheels section of the FAQ (``Stress Relieving Spokes''). - Use swaged (``butted''; thinner in the center) spokes. The elbow and threads take high loads and should be of thicker material; the center should be slightly thinner so most stretching takes place in the center section, thus reducing elbow and thread failures. Using swaged spokes also reduces rim cracking at the spoke hole. - Choose spokes according to the type of wheel failure. If spoke or rim eyelet durability is a problem, use lighter spokes. It may seem odd to solve breaking problems by going to a lighter spoke; but spokes are run at 1/2 their yield strength or less, so do not break from overload. Instead, they fail from gradual degradation caused by repeated stretching and relaxing of the metal. Lighter spokes cause the wheel load to be shared among more spokes, reducing the loads on each spoke and thus improving spoke lifetime. A similar mechanism can damage rims at the eylet, and lighter spokes can therefore also help reduce rim damage. Note that using more spokes and a rim with greater radial stiffness also helps spoke and rim bed durability. - If wheel collapse is a problem, use thicker spokes. Note that very thick spokes (2.3mm) will not fit in some hubs. Beware that using thick spokes may hurt spoke and rim bed durability. Note that using more spokes and using a rim with greater radial stiffness and greater lateral strength and stiffness can also reduce wheel collapse. - Use brass (not aluminum) nipples. Aluminum nipples also break more often, especially at high spoke tensions. Brass nipples allow periodic adjustment with less chance of wheel damage. Aluminum nipples tend to sieze and gall. With thse considerations in mind, here are some specific recommendations: (1) Fix the existing wheels. In my experience, most wheels are under-tensioned, even those built by many reputable shops. Many problems with existing wheels can be solved by simply truing the wheel, raising the spoke tension to an appropriate level for the rim, and by stress-relieving the spokes. A conventional wheel can then give good service for many heavy riders. Unfortunately, manufacturers do not rate rims for spoke tension (I have seen only one rim that was marked or rated), so it is necessary to gradually overtension the wheel and then back off, as described in _The Bicycle Wheel_ [Brandt]. Beware that many mechanics are unfamiliar with tensioning and stress relieving procedures, or claim familiarity but do not perform them correctly. Thus, while there are also many mechanics do it right, you cannot assume the mechanics know what they are doing. Familiarize yourself with the tensioning and stress-relieving proeceudres, then interview the mechanic who would repair your wheel, and ask them to explain in detail how they determine proper spoke tension and how they stress-relieve the spokes. If they deviate from the standard procedure, there is a good chance they are missing something important. Note also that a shop or particular mechanic may have a history of satisfied customers and yet still build wheels with low spoke tension and/or improper stress relieving. This can occur because low tension and lack of stress relieving are less important for average riders, so such wheels may not lead to customer returns. (2) Use a deep-section rim. The simplest and probably cheapest change is to use a deep-section rim. Here, ``deep'' means at least 30mm. A deep-section rim allows you to reuse your existing hub and/or buy inexpensive ``mainstream'' hubs, yet a deep-section rim builds a wheel which is dramatically stronger and more durable than a wheel built with a shallower rim. Deep-section rims also give better rim brake cooling, which may be important for heavy riders in hilly areas. Painted rims should be avoided if cooling is a concern; color anodizing does not hurt cooling. Fortunately, deep-section rims are available from several makers in most common sizes (20", 650C, 26", 700C). For dished wheels, given a choice between a deep rim and a rim with offset spoke holes, I do not have data about which is better. My intuition tells me that an off-center rim is probably more imporant the steeper the dish. So, for example, an off-center rim might build a stronger wheel for a 10-speed cluster in a 130mm dropout, while a deep-section rim might build a stronger wheel for an 8-speed cluster in a 135 dropout. (3) Use more spokes; use lightweight spokes. All other things equal more spokes builds a stronger and more durable wheel. However, a deep-section rim is of sufficient benefit that if you are forced to use a shallower rim in order to get more spokes, it may be the same either way. With many spokes (e.g., 48), it is relatively easy to overload the rim while the tension of each spoke is still low. A stiffer rim allows a greater spoke tension, so a deep-section rim still helps to build a strong wheel. Using more spokes allows the use of lighter spokes, which increases spoke and rim bed durability. (4) Avoid ``trendy'' solutions. When discussing strong wheels, special techniques often come up. For example: asymmetrical lacing, straight-pull spokes, paired or crossed spokes, alternative spoke materials, and so on. For any given weight of wheel, these approaches have not demonstrated measurable stiffness or strength benefits in any tests I know of. In addition, they are typically only available in low spoke count wheels anyway. Finally, trendy solutions are typically more expensive. Thus, the best value wheels are typically built using standard components. [Brandt] Jobst Brandt, ``The Bicycle Wheel''. Avocet Press; 3rd edition, October 1998. User Contributions:Comment about this article, ask questions, or add new information about this topic:Top Document: Rec.Bicycles Frequently Asked Questions Posting Part 3/5 Previous Document: 8c.7 Wheel Bearing adjustment Next Document: 8d Tech Chains Part1 - Part2 - Part3 - Part4 - Part5 - Single Page [ Usenet FAQs | Web FAQs | Documents | RFC Index ] Send corrections/additions to the FAQ Maintainer: iglesias@draco.acs.uci.edu (Mike Iglesias)
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All throughout time, we can see how we have been carefully conditioned to come to this point where we are on the verge of a cashless society. Did you know that the Bible foretold of this event almost 2,000 years ago?
In the last book of the Bible, Revelation 13:16-18, we read,
"He (the false prophet who deceives many by his miracles--Revelation 19:20) causes all, both small and great, rich and poor, free and slave, to receive a mark on their right hand or on their foreheads, and that no one may buy or sell except one who has the mark or the name of the beast, or the number of his name.
Here is wisdom. Let him who has understanding calculate the number of the beast, for it is the number of a man: His number is 666."
Referring to the last generation, this could only be speaking of a cashless society. Why's that? Revelation 13:17 tells us that we cannot buy or sell unless we receive the mark of the beast. If physical money was still in use, we could buy or sell with one another without receiving the mark. This would contradict scripture that states we need the mark to buy or sell!
These verses could not be referring to something purely spiritual as scripture references two physical locations (our right hand or forehead) stating the mark will be on one "OR" the other. If this mark was purely spiritual, it would indicate both places, or one--not one OR the other!
This is where it really starts to come together. It is incredible how accurate the Bible is concerning the implantable RFID microchip. Here is information from someone named Carl Sanders who worked with a team of engineers to help develop this RFID chip:
"Carl Sanders sat in seventeen New World Order meetings with heads-of-state officials such as Henry Kissinger and Bob Gates of the C.I.A. to discuss plans on how to bring about this one-world system. The government commissioned Carl Sanders to design a microchip for identifying and controlling the peoples of the world—a microchip that could be inserted under the skin with a hypodermic needle (a quick, convenient method that would be gradually accepted by society).
Carl Sanders, with a team of engineers behind him, with U.S. grant monies supplied by tax dollars, took on this project and designed a microchip that is powered by a lithium battery, rechargeable through the temperature changes in our skin. Without the knowledge of the Bible (Brother Sanders was not a Christian at the time), these engineers spent one-and-a-half-million dollars doing research on the best and most convenient place to have the microchip inserted.
Guess what? These researchers found that the forehead and the back of the hand (the two places the Bible says the mark will go) are not just the most convenient places, but are also the only viable places for rapid, consistent temperature changes in the skin to recharge the lithium battery. The microchip is approximately seven millimeters in length, .75 millimeters in diameter, about the size of a grain of rice. It is capable of storing pages upon pages of information about you. All your general history, work history, criminal record, health history, and financial data can be stored on this chip.
Brother Sanders believes that this microchip, which he regretfully helped design, is the “mark” spoken about in Revelation 13:16–18. The original Greek word for “mark” is “charagma,” which means a “scratch or etching.” It is also interesting to note that the number 666 is actually a word in the original Greek. The word is “chi xi stigma,” with the last part, “stigma,” also meaning “to stick or prick.” Carl believes this is referring to a hypodermic needle when they poke into the skin to inject the microchip."
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