Bikeopnik what is this?

"Straightsix9904" (Straightsix9904) 05/04/2014 at 18:36 • Filed to: None

0

10

Does anybody know what this? It appears to be some kind of puller like for a crank? I bought a bunch of tools off a guy a long time ago and this was in there, needless to say, I've never used it. It is park tool brand but there is no number.

Montalvo > Straightsix9904 05/04/2014 at 18:41

1

Do you have a picture of the bottom? It looks like a tap and die to me.

McMike > Straightsix9904 05/04/2014 at 18:45

1

Sold as a pair - you need both to use it.

http://www.parktool.com/product/frame-…

davedave1111 > Straightsix9904 05/04/2014 at 18:47

0

[Edit: it isn't what I thought. McMike has it.]

TheJWT > Straightsix9904 05/04/2014 at 18:50

0

Chain breaker maybe?

Straightsix9904 > McMike 05/04/2014 at 18:52

1

I do have two! You win!

Newsboy > Straightsix9904 05/04/2014 at 20:36

1

McMike beat me to it. They're dropout alignment tools. You clamp the thin part just below the head into the dropout on either side (on the frame or fork), and then extend that fat black tube at the end until they just touch each other in the middle, between the dropouts. Then push or pull the handles and until the tubes line up with each other.

Rear derailleur problems are frequently caused by misaligned derailleur hangers, which are often a result of a misaligned right side dropout.

Two of these and a derailleur alignment checker will fix a good portion of rear shifting problems.

Park Tools has a great how-to: http://www.parktool.com/blog/repair-he…

Newsboy > Newsboy 05/04/2014 at 20:40

0

Hanger Alignment Tool:

http://www.parktool.com/blog/repair-he…

JACU - I've got bonifides. > Straightsix9904 05/04/2014 at 20:44

0

Now this is a crank yanker...

tromoly > Newsboy 05/04/2014 at 22:35

0

In industry it's called a F.A.G., or Frame Alignment Gauge. The other tool you posted is referred to as a D.A.G., or Derailleur Alignment Gauge. Both are, um, interesting to use, and in come cases the equivalent of Clarkson using a hammer to fix everything, except it's the proper way to fix things.

Newsboy > tromoly 05/05/2014 at 01:37

0

+1

I was a professional bike mechanic for 12 years, but it's been a while. Fortunately my current job pays a hell of a lot better, it's hard to live on $9/hr.