9/16" One-Piece Cranks

Quoted message said:

Anyone ever successfully tapped a one-piece crank to 9/16"? How did it
go? Or does anyone know of a 1/2" clipless pedal or way to modify?

alan.

Tapping most one-piece cranks to 9/16" thread would cut the crank in
two at the pedal eye.

I seem to recall seeing some 1/2" thread Wellgo (?) clipless pedals,
but I can't find them right now.

Jeff

<[email hidden]> wrote in message
news:[email hidden]...

Quoted message said:

Anyone ever successfully tapped a one-piece crank to 9/16"? How did it
go? Or does anyone know of a 1/2" clipless pedal or way to modify?

alan.

The only thing that I know you could do is to use a 9/16" to 1/2" pedal
adapter like from Harris Cyclery http://sheldonbrown.com/harris/pedals.html

All the cranks that I see won't have enough metal left after you drill and
tap them out. But maybe some do though.
These size taps aren't all that cheap either, and you need both the left and
right hand thread taps. The other thing is you have to use a good drill
press and a lot of precision to get the holes straight and tap it out
straight too, otherwise the pedals may have a wobble to them that wull drive
you crazy.

Quoted message said:

Anyone ever successfully tapped a one-piece crank to 9/16"? How did it
go? Or does anyone know of a 1/2" clipless pedal or way to modify?

No can do.
Get a conversion set to run aluminum cranks in your OPC shell.

--
Andrew Muzi
www.yellowjersey.org
Open every day since 1 April, 1971

OPC?
Old Piece of Cheet?

Kurd said:

OPC?
Old Piece of Cheet?

OPC is defined in the subject header.

--
Dave
dvt at psu dot edu

Quoted message said:

Anyone ever successfully tapped a one-piece crank to 9/16"?

The common Ashtabula-style cranks seen on department-store bikes don't
have enough meat in the ends to permit this to be done safely. Some
BMX versions would be able to handle it. The real question, IMO, is
why bother? By the time you round up a suitable crank, drill it, and
get the left-hand tap or have the hole threaded, you could mount up a
three-piece setup using a set of adapter bearings and make the whole
project a lot less work.

--
Typoes are a feature, not a bug.
Some gardening required to reply via email.
Words processed in a facility that contains nuts.

Quoted message said:

Anyone ever successfully tapped a one-piece crank to 9/16"? How did it
go?

This is not physically possible. If you made the crank fat enough to
support a 9/16" pedal mounting hole, it would not fit through the
bearing cones, so you wouldn't be able to install it.

Quoted message said:

Or does anyone know of a 1/2" clipless pedal or way to modify?

1/2" clipless pedals were once available, I bought a pair for my 1916
Mead Ranger. Unfortunately they've gone extinct.

One of these days some pedal manufacturer is going to wake up to this
unmet need and make a bundle of money. I get a LOT of requests for such
pedals, mainly for use on exercise "bikes."

Sheldon "http://harriscyclery.com/opc" Brown
+---------------------------------------------------------+
| Our country is the world - our countrymen are mankind |
| --William Lloyd Garrison |
+---------------------------------------------------------+
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

Quoted message said:

Kurd said:

OPC?
Old Piece of Cheet?

dvt said:

OPC is defined in the subject header.

I think you missed his attempted at humor. "Cheet" should be read like
"sheet" should be read like "[censored]"

get it?
\\paul

Sheldon Brown aka Sheldon Brown said:

Quoted message said:

Anyone ever successfully tapped a one-piece crank to 9/16"? How did it
go?

This is not physically possible. If you made the crank fat enough to
support a 9/16" pedal mounting hole, it would not fit through the
bearing cones, so you wouldn't be able to install it.

Quoted message said:

Or does anyone know of a 1/2" clipless pedal or way to modify?

1/2" clipless pedals were once available, I bought a pair for my 1916
Mead Ranger. Unfortunately they've gone extinct.

One of these days some pedal manufacturer is going to wake up to this
unmet need and make a bundle of money. I get a LOT of requests for such
pedals, mainly for use on exercise "bikes."

Would it not be possible to take an existing pedal spindle, turn down
the threaded area, and roll or cut new threads so it would fit a
½-inch crank? However, I would not expect this to be economical unless
one really needed to do so (e.g. Mr. Brown's referenced Mead Ranger).

--
Tom Sherman

Why bother? Well, a friend and I are working on a project. We want to
make a statement that the guys with the nicest toys don't always have
the most fun:

www.teamroadmeister.blogspot.com

Hope you'll find it amusing. Check out the link to the UCBCI for more
laughs!

alan.

Paul Hobson said:

Quoted message said:

Kurd said:

OPC?
Old Piece of Cheet?

dvt said:

OPC is defined in the subject header.

I think you missed his attempted at humor. "Cheet" should be read like
"sheet" should be read like "[censored]"

get it?
\\paul

I got the joke the first time. I still think he didn't know what OPC meant.

--
Dave
dvt at psu dot edu