Spokes - straight vs J

[chris_w_65]

Is there any advantage of straight pull spokes over J spokes?

[Guest Big H]

Wat is ' n " J" spoke?

[chris_w_65]

Wat is ' n " J" spoke?

 

Standard spoke. Maybe more correctly referred to as a J pull bend spoke. Standard on wheels since forever. Some of the new type pre built factory wheels come with straight pull. Mavic, Fulcrum and Shimano to name some.

Edited December 25, 2010 by chris_w_65

[Zeps]

No worries Chris I am not an 'engineer' but even I know what you were referring to

[chris_w_65]

Standard spoke. Maybe more correctly referred to as a J pull spoke. Standard on wheels since forever. Some of the new type pre built factory wheels come with straight pull. Mavic, Fulcrum and Shimano to name some.

 

Big H, I think they may have used them on ox wagons too

Edited December 25, 2010 by chris_w_65

[Wernervdmerwe]

Straight is less prone to breakages as the j portion is the weakest spot on the spoke.

There is an article on it on the Industry nine website if you want to read up a bit on the subject / advantages

[_freak_]

and dont forget the cool factor...

[chris_w_65]

Straight is less prone to breakages as the j portion is the weakest spot on the spoke.

There is an article on it on the Industry nine website if you want to read up a bit on the subject / advantages

 

 

I have also heard that they are stronger.

 

Nice wheels on that site

 

I believe there are some disadvantages. Wheels with straight pull spokes are proprietry. Parts are often not available and spokes sometimes cost R80.00 each or even worse you have to buy them in a set.

[chris_w_65]

Straight is less prone to breakages as the j portion is the weakest spot on the spoke.

There is an article on it on the Industry nine website if you want to read up a bit on the subject / advantages

 

 

This is from their site. It refers to aluminium spokes but I assume the same applies to steel

 

I wonder if other straight pull spoke manufacturers also use a larger diameter thread to overcome the weakness?

 

Aluminum Spokes? How can they be as strong as steel?

 

By starting with a 20-25% larger cross-sectional area, our machined 7075-T651 aluminum is equal in tensile strength to any 14-gauge or 14/15 DB spoke available. In many ways, the Industry Nine spoke is much stronger, because we have removed all the weak points (known as stress risers) inherent in the design of a traditional hooked steel spoke.

First, the spoke has no bend. This is nothing new, but remains an intelligent design. Most steel spokes fail either at the middle of the bend, or the first thread at the nipple end. By eliminating the bend altogether, the spoke is instantly less prone to fatigue stress failure.

Second, the root diameter of the Industry Nine one-piece spoke thread is actually larger than the diameter of the length of the spoke. Other spokes fail at the first thread because the root diameter (the bottom of the thread’s “V”) is actually the smallest diameter of the spoke, just where slight relative motions of the nipple apply additional bending forces.

[kosmonooit]

I think a factor in them using straight pull for Al spokes is that material does not take kindly to bending, unlike steel.

[chris_w_65]

I think a factor in them using straight pull for Al spokes is that material does not take kindly to bending, unlike steel.

 

True

I think Shimano uses steel for all

Fulcrum uses alu on the top wheels and steel on the rest

Not sure with Mavic

[Wernervdmerwe]

Yeah - saved up and bought a pair, they are incredible, very quick engagement and very strong, while still under 2kg for the Enduro sets, one of the few manufacturers that provide an all-mountain wheelset under 2kg.

 

 

A mate of mine was kind enough to roll a stone out of my way with his back wheel, problem was, the stone acted as a bridge over a concrete storm water ditch. Tried bunny hopping over, can short and slammed my back wheel into the corner on the opposite side, completely destroying my tire, ripped one of the knobblies clean off and had a sidewall tear from the side of the knobbly to the rim. The rim however lost a bit of paint at the impact point and roughed the metal a bit, hardly noticeable - wheel still true!

 

Be that spokes or rim, I love the I-9 wheels!

 

The spokes are around R3k - R4k a set though, which is rough, but I believe another manufacturers using steel spokes are obviously substantially cheaper.

[chris_w_65]

Yeah - saved up and bought a pair, they are incredible, very quick engagement and very strong, while still under 2kg for the Enduro sets, one of the few manufacturers that provide an all-mountain wheelset under 2kg.

 

 

A mate of mine was kind enough to roll a stone out of my way with his back wheel, problem was, the stone acted as a bridge over a concrete storm water ditch. Tried bunny hopping over, can short and slammed my back wheel into the corner on the opposite side, completely destroying my tire, ripped one of the knobblies clean off and had a sidewall tear from the side of the knobbly to the rim. The rim however lost a bit of paint at the impact point and roughed the metal a bit, hardly noticeable - wheel still true!

 

Be that spokes or rim, I love the I-9 wheels!

 

The spokes are around R3k - R4k a set though, which is rough, but I believe another manufacturers using steel spokes are obviously substantially cheaper.

 

You must have saved a lot

[Guest Big H]

No worries Chris I am not an 'engineer' but even I know what you were referring to

 

Do they hang or stand on the naaf?

[Capricorn]

Werner: sounds almost like u tried to clear that ditch on the side of the road at Paarl, as you exit The Playground. Destroyer of many a rim that gutter

You have photos of your wheel set?

Edited December 25, 2010 by Capricorn

[chris_w_65]

Do they hang or stand on the naaf?

 

 

I think that discussion was had recently.

 

My personal opinion is hang. Remove the lower 50% of the spokes and it will still hang. Remove the upper 50% and you will be in k@k