pedal extenders broken?

[PhilDawson8270]

But you will not know what said billet is made from.

Hence why I said different steels

 

[HertzvanRental]

@HertzvanRe
[QUOTE="PhilDawson8270, post: 3802553, member: 33542"][USER=43034]@HertzvanRental

If you can send me the dimensions of the extenders, I can run some stress analysis on different steels.

Slow evening at work

Slow evening at work [/USER][/QUOTE]
[QUOTE="PhilDawson8270, post: 3802553, member: 33542"][USER=43034]@HertzvanRental

Thanks for the response. I am away for the weekend so cannot access the extenders. I can confirm that the design is similar to that shown in the OP photo. The shoulder between the male and female section is square, not tapered or radishes. I will send dimensions when I can but I'm already thinking that perhaps these are something I could do without!![/QUOTE][/user]

 

[HertzvanRental]

For radishes read radiused!!!

 

[Gravity Aided]

When speaking of billet steel,they may be referring to centrifugal casting. That would be quite strong as a material application. But I doubt that would be used here.

 

[marzjennings]

If those are Specialized extenders, well there's a recall on them...

http://www.bikeradar.com/news/article/specialized-recalls-body-geometry-pedal-extenders-44807/

 

[numbnuts]

A “billet” of steel to me (I'm a Blacksmith) is any steel that is over 12 x 12 inches and it is going to be forged in to some shape you start with a “billet” this could be just mild steel or tool steel.

 

[midlife]

They don't look any different to how the threaded part of any pedal spindle seem to exit from the body of the spindle.

Something metallurgically wrong at manufacture?

Shaun

 

[HertzvanRental]

@HertzvanRental

If you can send me the dimensions of the extenders, I can run some stress analysis on different steels.

Slow evening at work

The "male" spigot is 14mm in diameter.
The "female" part is 21mm long, with a diameter of 22mm. As stated, the shoulders between the two are square-not tapered or radiused.
Thank you

 

[spiderman2]

The "male" spigot is 14mm in diameter.
The "female" part is 21mm long, with a diameter of 22mm. As stated, the shoulders between the two are square-not tapered or radiused.
Thank you

But its not a solid piece of metal ,has a hole all the way through!

 

[HertzvanRental]

But its not a solid piece of metal ,has a hole all the way through!

No, the hole is not all the way through. It is solid other than the "female" section which has been drilled and tapped to a depth of 13mm to accept the stud of the pedal.

 

[spiderman2]

No, the hole is not all the way through. It is solid other than the "female" section which has been drilled and tapped to a depth of 13mm to accept the stud of the pedal.

The male part that screws into the crank has a hole through it for an alan key.

 

[HertzvanRental]

View attachment 96740
The male part that screws into the crank has a hole through it for an alan key.

Not in mine! There are "flats" on the female section that take a 19mm spanner

 

[spiderman2]

Not in mine! There are "flats" on the female section that take a 19mm spanner

Can you give a link to where you purchased yours, and a picture if possible. Perhaps yours are better made.

 

[HertzvanRental]

I bought these from e-bay. Type in sjx-motorsport-pedal extensions and it should come up. This is an American company so the price is quoted in dollars (about $14-00 I think).

I would upload some pictures if I knew how!!!

 

[Gravity Aided]

Product Features

• Includes one Right and one Left Pedal Extender
• Use this set with any 9/16" threaded pedals to extend the pedal position outward by 21mm (0.825")
• Prevents knee strain and rubbing against the rear tire/frame for those with a naturally wide stance
• CNC machined from solid billet Chrome-moly steel
• Right and Left extenders are easily identifiable with "R" and "L" markings

This listing includes one set (right and left) of bicycle pedal extenders that can be used with your bike pedals to extend the position of the pedals outward by 21mm (0.825"). For those bike riders with a naturally wide stance this product is essential to prevent knee strain and rubbing against the rear tire/frame. The set includes a right and left handed set of pedal extenders that can only be used on cranks with 9/16" thread (most common). All pedal extender sets are made from hardened billet chrome-moly steel and coated with black oxide coating for protection. Right and Left extenders are easily identifiable with "R" and "L" markings. Remember: Right extenders must be tightened clockwise and left extenders must be tightened counter-clockwise.