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Bikerumor Monday Mystery Pic

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bikerumor monday mystery bike part picture

Photo from the collection of Rustybicycle. If you think you know what this is, post your answer in ‘comments’ – the answer will be posted there on Tuesday!

To send in your own Mystery Pic to be considered for the Monday feature, click here and attach your photo with all pertinent information.

 

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19 Comments
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Me
Me
11 years ago

Crank extender for a cotterpin crank? Thats all I can think of.

tim bateman
tim bateman
11 years ago

Looks like a linkage from a Schwinn Air-dyne that helps connect the crank-arms to the moving handlebars. Probably one of the last hold-outs for cotter pin usage.

Charlie
Charlie
11 years ago

It looks like it could be an extender, but it it would run perpendicular to the crankset. You’d have a 90 degree bend in your crankarm, I think. that might look cool.

JON
JON
11 years ago

Cottered crack from a clown bike

JON
JON
11 years ago

CRANK!

Derric
Derric
11 years ago

This is a Schwinn Airdyne Eccentric Arm for the Left side. Still used today on new Airdynes.

Mr. C
Mr. C
11 years ago

It’s an extension piece to make a cottages crank longer!

Mr. C
Mr. C
11 years ago

Spell checker! That should have read: it’s an extension piece to make a cottered crank longer.

Jason Aven
Jason Aven
11 years ago

It is an old Cotter pin that is designed to attach the crank to the bottom bracket spindle

JON
JON
11 years ago

Think your right! Or to get past some funky frame shape

Matt
Matt
11 years ago

Crankarm eccentric

CJ Anten
CJ Anten
11 years ago

Spring retainer for an old Singlespeed retention system.

fleche1454
fleche1454
11 years ago

airdyne eccentric crank pin

JimmyWu
11 years ago

…no hands air-hanky.

Chris Michaels
Chris Michaels
11 years ago

Totally Airdyne! Work on these all the time! Good one, maybe post some esoteric dropouts next time.

JON
JON
11 years ago

meh, not even a real bike part!

KDAY
11 years ago

It’s what Derric said. Excentric for a Schwinn Airdyne. Fixed many in my day’s a the bike shop.

q-rim
q-rim
11 years ago

IKEA assembly kit?… j/k
Looks like a piviot joint for an old bike? A rod driven brake part?

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