Tool id

[Matthew3901]

Any idea what this is?

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[tony p]

That looks like a traditional bicycle maintenance wrench.

The 'hook' end would be for the lock-ring of the bottom bracket (the bearing through which the crank axle passes) and the box ends probably fit most of the hex-heads on the rest of the bike it was intended for.

The hook end might also be used for adjustable spring perches on coil-over shocks with threaded bodies, but they are normally standalone tools - not combined with a box wrench.

 

[Jim Johnstone]

Tony could be right, definitely looks like a bottom bracket hook spanner. Approximately how big is the radius?

 

[Gmonkee]

Bike bottom bracket wrench. Mainly used when the pinned crank arms were common.

I have another just like that, I have used it once.

 

[Matthew3901]

Wow neat...I have no use for it....but it is neat looking. It came in a used tool box and it was at the bottom. I figured it may have been some special transmission tool. Bikes need work too!

 

[Jim Johnstone]

Bike bottom bracket wrench. Mainly used when the pinned crank arms were common.

I have another just like that, I have used it once.

Not necessarily that old. I've worked on plenty of cup and cone bottom brackets on road racing bikes and tons of bmx bikes. Bmx are in the stone ages for that sort of technology.

10 years as a bike mechanic and I have seen exactly one cottered crank.

 

[Gmonkee]

From my teens to the present as a bike hobbyist and I have seen many cottered cranks.

Older English bikes and low end models here in Mexico. Definitely on the way out now.

The example I have is SAE in the wrench end so it is older.

 

[toolmiser]

Didn't older "storm" doors use a tool like that to adjust the closer?