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#1
July 15th 04, 02:25 AM
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Half radial spoking and the new Dura-Ace wheels
I have Shimano SH7701 wheels and find them to be very durable. I just had
my first broken spoke last Sunday with 9,375 miles on the wheels. I had two pairs of Rolf Sestrienes. The rear rims cracked on both pairs at about 6,000 miles. http://nanandmont.com/bike/2002/crack1.jpg http://nanandmont.com/bike/2002/crack2.jpg http://nanandmont.com/bike/2002/crack3.jpg "Ritch" wrote in message om... Sheldon's site, http://www.sheldonbrown.com/wheelbuild.html#half-radial says semi-tangent spokes on the right side (drive side) and radial spokes on the left side (NDS) can make highly dished rear wheels more durable. Look at the 2005 Dura-Ace wheels, http://www.cyclingnews.com/photos/20...800-carbon-hub and it looks like radial on the right and semi-tangent on the left. Has Shimano got it the wrong way around, or does Sheldon's page need correction? Perhaps and engineer/wheel expert can shed some light... Ritch (unfortunately I am neither an engineer or wheel expert) 
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#2
July 15th 04, 04:47 AM
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Half radial spoking and the new Dura-Ace wheels
Ritch wrote:
Sheldon's site, http://www.sheldonbrown.com/wheelbuild.html#half-radial says semi-tangent spokes on the right side (drive side) and radial spokes on the left side (NDS) can make highly dished rear wheels more durable. Look at the 2005 Dura-Ace wheels, http://www.cyclingnews.com/photos/20...800-carbon-hub and it looks like radial on the right and semi-tangent on the left. Has Shimano got it the wrong way around, or does Sheldon's page need correction? Perhaps and engineer/wheel expert can shed some light... When you see half-radial wheels with the radials on the right, it is generally for reasons of chain/derailer clearance. Mavic does this on their wheels with fat aluminum spokes, and I have no doubt this is the reason Shimano did it. If you look at the overall width of the left flange vs the right flange you can see the potential clearance issue with the side-by-side nipples. Sheldon "Make It Fit" Brown +---------------------------------+ | Is ambivalence a bad thing? | | Well, yes and no. | | -- Garrison Keillor | +---------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com
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#3
July 15th 04, 04:47 AM
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Half radial spoking and the new Dura-Ace wheels
Ritch wrote:
Sheldon's site, http://www.sheldonbrown.com/wheelbuild.html#half-radial says semi-tangent spokes on the right side (drive side) and radial spokes on the left side (NDS) can make highly dished rear wheels more durable. Look at the 2005 Dura-Ace wheels, http://www.cyclingnews.com/photos/20...800-carbon-hub and it looks like radial on the right and semi-tangent on the left. Has Shimano got it the wrong way around, or does Sheldon's page need correction? Perhaps and engineer/wheel expert can shed some light... When you see half-radial wheels with the radials on the right, it is generally for reasons of chain/derailer clearance. Mavic does this on their wheels with fat aluminum spokes, and I have no doubt this is the reason Shimano did it. If you look at the overall width of the left flange vs the right flange you can see the potential clearance issue with the side-by-side nipples. Sheldon "Make It Fit" Brown +---------------------------------+ | Is ambivalence a bad thing? | | Well, yes and no. | | -- Garrison Keillor | +---------------------------------+ Harris Cyclery, West Newton, Massachusetts Phone 617-244-9772 FAX 617-244-1041 http://harriscyclery.com Hard-to-find parts shipped Worldwide http://captainbike.com http://sheldonbrown.com
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#4
July 15th 04, 05:14 AM
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Half radial spoking and the new Dura-Ace wheels
the only reason it could ever be "wrong" is when the hub is one of those
skinny ones that is subject to relative torsion between the left & right flanges. the new d/a wheel has a huge chunky hub so there's almost no relative torsion, hence you can get away with right side radial which, as sheldon says, has spoke clearance benefits. close clearance also results in spoke tension differential benefits too. Ritch wrote: Sheldon's site, http://www.sheldonbrown.com/wheelbuild.html#half-radial says semi-tangent spokes on the right side (drive side) and radial spokes on the left side (NDS) can make highly dished rear wheels more durable. Look at the 2005 Dura-Ace wheels, http://www.cyclingnews.com/photos/20...800-carbon-hub and it looks like radial on the right and semi-tangent on the left. Has Shimano got it the wrong way around, or does Sheldon's page need correction? Perhaps and engineer/wheel expert can shed some light... Ritch (unfortunately I am neither an engineer or wheel expert)
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#5
July 15th 04, 05:14 AM
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Half radial spoking and the new Dura-Ace wheels
the only reason it could ever be "wrong" is when the hub is one of those
skinny ones that is subject to relative torsion between the left & right flanges. the new d/a wheel has a huge chunky hub so there's almost no relative torsion, hence you can get away with right side radial which, as sheldon says, has spoke clearance benefits. close clearance also results in spoke tension differential benefits too. Ritch wrote: Sheldon's site, http://www.sheldonbrown.com/wheelbuild.html#half-radial says semi-tangent spokes on the right side (drive side) and radial spokes on the left side (NDS) can make highly dished rear wheels more durable. Look at the 2005 Dura-Ace wheels, http://www.cyclingnews.com/photos/20...800-carbon-hub and it looks like radial on the right and semi-tangent on the left. Has Shimano got it the wrong way around, or does Sheldon's page need correction? Perhaps and engineer/wheel expert can shed some light... Ritch (unfortunately I am neither an engineer or wheel expert)
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#6
July 15th 04, 06:19 AM
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Half radial spoking and the new Dura-Ace wheels
On Wed, 14 Jul 2004 21:14:47 -0700, jim beam wrote:
the only reason it could ever be "wrong" is when the hub is one of those skinny ones that is subject to relative torsion between the left & right flanges. Um, _any_ hub which is half-radial with the right side radial would be subject to exactly the same relative torsion, skinny or fat. The thing is, in order to be strong enough to not break under such torsion, the hub has to be fat. I can see no advantage in that. Dumb idea, copied from Rolf. -- David L. Johnson __o | Enron's slogan: Respect, Communication, Integrity, and _`\(,_ | Excellence. (_)/ (_) |
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#7
July 15th 04, 06:19 AM
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Half radial spoking and the new Dura-Ace wheels
On Wed, 14 Jul 2004 21:14:47 -0700, jim beam wrote:
the only reason it could ever be "wrong" is when the hub is one of those skinny ones that is subject to relative torsion between the left & right flanges. Um, _any_ hub which is half-radial with the right side radial would be subject to exactly the same relative torsion, skinny or fat. The thing is, in order to be strong enough to not break under such torsion, the hub has to be fat. I can see no advantage in that. Dumb idea, copied from Rolf. -- David L. Johnson __o | Enron's slogan: Respect, Communication, Integrity, and _`\(,_ | Excellence. (_)/ (_) |
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#8
July 15th 04, 07:31 AM
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Half radial spoking and the new Dura-Ace wheels
Monty top-posted:
I had two pairs of Rolf Sestrienes. The rear rims cracked on both pairs at about 6,000 miles. http://nanandmont.com/bike/2002/crack1.jpg http://nanandmont.com/bike/2002/crack2.jpg That was because your carpet was so loud. Bill "slow night" S.
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#9
July 15th 04, 07:31 AM
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Half radial spoking and the new Dura-Ace wheels
Monty top-posted:
I had two pairs of Rolf Sestrienes. The rear rims cracked on both pairs at about 6,000 miles. http://nanandmont.com/bike/2002/crack1.jpg http://nanandmont.com/bike/2002/crack2.jpg That was because your carpet was so loud. Bill "slow night" S.
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#10
July 15th 04, 11:24 AM
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Half radial spoking and the new Dura-Ace wheels
I am sure I will ever buy such a wheel but it is sure pretty.
"Ritch" wrote in message om... Sheldon's site, http://www.sheldonbrown.com/wheelbuild.html#half-radial says semi-tangent spokes on the right side (drive side) and radial spokes on the left side (NDS) can make highly dished rear wheels more durable. Look at the 2005 Dura-Ace wheels, http://www.cyclingnews.com/photos/20...800-carbon-hub and it looks like radial on the right and semi-tangent on the left. Has Shimano got it the wrong way around, or does Sheldon's page need correction? Perhaps and engineer/wheel expert can shed some light... Ritch (unfortunately I am neither an engineer or wheel expert)
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