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Lefty Upper collar seals

1643 Views 5 Replies 5 Participants Last post by  ladeef
So I contacted Cannondale asking them the sizes of the 3 o-rings in my lefty upper alloy collar - KH101. The seals were improperly installed from the factory: one ring pinched in the threading and another in 2 pieces. I asked Cannondale the specs of the o-rings and their response was that they could not find the info in any of their manuals. Duh! That’s why I was writing them. They told me to take the lefty to my LBS instead. Why can’t the source know all the specs of their own creations (rhetorical Q)? I’m hoping someone here might have the answer to the sizes of the 3 o-rings in the collar -KH101.
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Welcome to the new and improved multinational corporation run, cycling industry. Every brand is just an acquisition or merger away from greatness.

Perfect cover for people who think bikes are neat, but have never really actually ridden one.

One of our illustrious industries CEO's recently departed to become the leader at a famous mattress company, I kid you not.

That's how passionate he was, about cycling. =: /

I don't know the numbers off the top of my head or I'd share.

I'd call McMaster Carr, the workaday dude or dudette who answers (generally on the first ring) will be able to help you figure it out in about 3 minutes, and sell you the desired parts. Or, bring them to your local home centers o ring chest of drawers, and matchy matchy till you get the right ones.
Edit:
The original post is incorrect, even though I had obtained that info directly from a prominent online Cannondale parts retailer. Correct o-rings are (in metric and preferably nitrile o-rings, eg. Buna-N):
ID 39 x OD 42 x CS 1.5mm
ID 34 x OD 37 x CS 1.5mm
ID 29 x OD 32 x CS 1.5 mm
*CS = cross section
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Original post:
So, for anyone interested, I found the sizes for the 3 o-rings in the KH-101 collar:

039 Buna-N O-Ring, 70A Durometer, Black, 2-3/4" ID, 2-7/8" OD, 1/16" Width

029 Buna-N O-Ring, 50A Durometer, Round, Black, 1-1/2" ID, 1-5/8" OD, 1/16" Width

034 Buna-N O-Ring, 70A Durometer, Black, 2-1/8" ID, 2-1/4" OD, 1/16" Width
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So, for anyone interested, I found the sizes for the 3 o-rings in the KH-101 collar:

039 Buna-N O-Ring, 70A Durometer, Black, 2-3/4" ID, 2-7/8" OD, 1/16" Width

029 Buna-N O-Ring, 50A Durometer, Round, Black, 1-1/2" ID, 1-5/8" OD, 1/16" Width

034 Buna-N O-Ring, 70A Durometer, Black, 2-1/8" ID, 2-1/4" OD, 1/16" Width
Nice. Thanks for the follow up. I bet it’ll help others in the future.


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Nice. Thanks for the follow up. I bet it’ll help others in the future.


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Here is a diagram, and dimensions in metric. I looked to purchase the 39mm seal separately but looks like ya gotta buy 100 at a crack, anyone find these online or recommend a store to get onsies twosies?
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My friend who works in seal supply just gave me a pack of 10, let me know if anyone wants some.
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