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#1
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durability of Mavic MA3s?
I've just found that a Mavic MA3 rim on one of my bikes has had a spoke
tear the rim. I've done a bit of Googling and it looks like the MA3s of my vintage (about three years old) might not have been the most reliable. What should I use to replace the failed MA3? The wheel is used on a cyclocross bike that sees rugged use. It's my heaviest road bike; it sometimes gets ridden fairly hard over broken asphalt and dirt roads, and has heavy Continental Travel Contact 37mm tires on it. Are newer MA3s more reliable? Are there other more reliable rims that would allow me to reuse the same spokes (ie, that have the same dimensions)? |
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#2
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durability of Mavic MA3s?
Jay S. Hill writes:
I've just found that a Mavic MA3 rim on one of my bikes has had a spoke tear the rim. I've done a bit of Googling and it looks like the MA3s of my vintage (about three years old) might not have been the most reliable. What should I use to replace the failed MA3? The wheel is used on a cyclocross bike that sees rugged use. It's my heaviest road bike; it sometimes gets ridden fairly hard over broken asphalt and dirt roads, and has heavy Continental Travel Contact 37mm tires on it. Are newer MA3s more reliable? Are there other more reliable rims that would allow me to reuse the same spokes (ie, that have the same dimensions)? MA-3 rims have not changed and carry the same design weakness they have always had. They use only eyelets and no sockets to distribute spoke load to both inner and outer bed of the rim. This has been a failing of these rims from their introduction and causes rim cracking around the eyelets. I cannot imagine what Mavic was thinking when they discontinued the MA-2 that was the standard of the wheel business for many years with its sockets and eyelets that rarely developed rim cracks even under the most severe off road (large stress cycle) service. The machinery to build the MA-2 as the extrusion dies for the profile are neither complex nor out of the ordinary. What's the catch? Jobst Brandt |
#3
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durability of Mavic MA3s?
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#4
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durability of Mavic MA3s?
Jay S. Hill wrote:
I've just found that a Mavic MA3 rim on one of my bikes has had a spoke tear the rim. I've done a bit of Googling and it looks like the MA3s of my vintage (about three years old) might not have been the most reliable. What should I use to replace the failed MA3? The wheel is used on a cyclocross bike that sees rugged use. It's my heaviest road bike; it sometimes gets ridden fairly hard over broken asphalt and dirt roads, and has heavy Continental Travel Contact 37mm tires on it. Are newer MA3s more reliable? Are there other more reliable rims that would allow me to reuse the same spokes (ie, that have the same dimensions)? what is your spoke tension? these rims need to be built with the aid of a tensiometer. excess tension will cause cracking just as you describe. no known differences on ma3's over time. if you want a change, there are plenty of other rims out there, but not many with the same effective rim diameter [erd] so a change of rim probably means re-spoking. if you want something more abuse tolerant, one of the mavic touring rims like the a719 are very robust but have different erd's and probably drilling count too. |
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durability of Mavic MA3s?
wrote: The machinery to build the MA-2 as the extrusion dies for the profile are neither complex nor out of the ordinary. What's the catch? I think that is the catch. If you have a $15 item that you mark up 100%, you make $15. If you have a $30 item that you mark up 100%, you make $30. Manufacturers typically price on cost+ with a standard mark up, more if it has some voodoo they can sell. If you look at the outrageous prices on Mavic's current price list I think you'll have your answer. Or, maybe it is just change for change's sake, i.e. for new MBA's sake. What do you think of http://tinyurl.com/cjwd6 ? Note that the CD finish is only one option, it is also made in silver anodized. i |
#7
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durability of Mavic MA3s?
George King writes:
The machinery to build the MA-2 as the extrusion dies for the profile are neither complex nor out of the ordinary. What's the catch? I think that is the catch. If you have a $15 item that you mark up 100%, you make $15. If you have a $30 item that you mark up 100%, you make $30. Manufacturers typically price on cost+ with a standard mark up, more if it has some voodoo they can sell. If you look at the outrageous prices on Mavic's current price list I think you'll have your answer. Or, maybe it is just change for change's sake, i.e. for new MBA's sake. What do you think of http://tinyurl.com/cjwd6 That looks great. Now all I need to do is get some of these from my LBS. Jobst Brandt |
#8
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durability of Mavic MA3s?
Jay S. Hill Wrote: I've just found that a Mavic MA3 rim on one of my bikes has had a spoke tear the rim. I've done a bit of Googling and it looks like the MA3s of my vintage (about three years old) might not have been the most reliable. What should I use to replace the failed MA3? The wheel is used on a cyclocross bike that sees rugged use. It's my heaviest road bike; it sometimes gets ridden fairly hard over broken asphalt and dirt roads, and has heavy Continental Travel Contact 37mm tires on it. Are newer MA3s more reliable? Are there other more reliable rims that would allow me to reuse the same spokes (ie, that have the same dimensions)? Mavic rates the MA3 for 85 kg maximum rider + gear weight while othe standard road rims like Open Pro CXP-33, CXP-22 are rated @ 100 kg. Yes, I know MA3s are heavier, but they aren't as strong. Sun CRE16 and Sun CRT16II are strong and wide and have ERD within .5 m of the MA3. Current manufacturers and models worth considering(if you are willin to buy new spokes) a Velocity Dyad and Mavic A719. Mavic rates the A719 @ 125 kg maximu rider + gear weight. A719 uses eyelets and sockets at each spoke hole Velocity Dyad doesn't use eyelets or sockets at the spoke holes an isn't as refined as Mavic A719, but it is a very tough rim. We us Velocity Dyads on our 700C touring tandem. They have not been touc since the original build ~7,000 miles ago -- daveornee |
#9
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durability of Mavic MA3s?
wrote: What do you think of http://tinyurl.com/cjwd6 That looks great. Now all I need to do is get some of these from my LBS. Jobst Brandt If you manage that, Jobst, could you share your secret? As far as I can determine, Ambrosio rims are only available in the U.S. under the Torelli brand name, and Torelli says those particular rims are no longer being made. I'd love to get my hands on a couple sets of rims like the old MA-2. Jeff |
#10
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durability of Mavic MA3s?
"JeffWills" wrote in message ups.com... wrote: What do you think of http://tinyurl.com/cjwd6 That looks great. Now all I need to do is get some of these from my LBS. Jobst Brandt If you manage that, Jobst, could you share your secret? As far as I can determine, Ambrosio rims are only available in the U.S. under the Torelli brand name, and Torelli says those particular rims are no longer being made. I'd love to get my hands on a couple sets of rims like the old MA-2. A couple of online places that sells Ambrosio rims are www.ital-tecno.com http://www.ridecampy.com/26/cat26.htm?77 |
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