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OK, I have a strange, strange info request.....

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OK, I have a strange, strange info request.....

Old 05-09-14, 04:37 PM
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PolarBear007
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OK, I have a strange, strange info request.....

Hi Framebuilders!

OK, I'm having a bit of a challenge. I want a bolt-on sort of eyelet (or some sort of clamp) to go on a part of the bicycle frame for which I do not know the name

What I'm wanting is a sort of bolt-on threaded eyelet for the tubes (which are on both sides of the rear tire) that go from the top of the seat tube to the chainstay drop outs.

I want a pair of these to bolt on my bike so as to give me a better/more secure place of attaching a rear rack onto my bicycle which does not have eyelets brazed onto those tubes.

Clear as mud?!?

Anyway, if you can decipher what I'm trying to accomplish - KUDOS to you and thanks for any guidance you would provide!

frank
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Old 05-09-14, 04:51 PM
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Very clear you need clamps for yuor seat stays so you can install a rear rack. Here is a link to an example. oldmanmountain: 1/2 Inch OMM Band Clamps one pair
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Old 05-09-14, 06:02 PM
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Frank, if your rear dropouts have the triangular cutout similar to the Campy 1010s, Jim Blackburn made a clever insert that functions as an eyelet for attaching rear racks. I don't believe they're made anymore, but you can still find them NOS on ebay and some retailers.

If you can't find any, it shouldn't be too hard to make a pair with rubber grommets, appropriate stainless nuts and bolts, and some stainless washers.

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Old 05-09-14, 06:09 PM
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PolarBear007
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Originally Posted by bhchdh View Post
Very clear you need clamps for yuor seat stays so you can install a rear rack. Here is a link to an example. oldmanmountain: 1/2 Inch OMM Band Clamps one pair
These look quite interesting, but I was thinking something more robust than banding material. Something like 2 halves of a pipe (but thicker and maybe 3-5mm wide) bolted together on one side and the other side somehow having a larger eye-bolt-sized threaded tube.
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Old 05-09-14, 06:11 PM
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Originally Posted by Scooper View Post
Frank, if your rear dropouts have the triangular cutout similar to the Campy 1010s, Jim Blackburn made a clever insert that functions as an eyelet for attaching rear racks. I don't believe they're made anymore, but you can still find them NOS on ebay and some retailers.

If you can't find any, it shouldn't be too hard to make a pair with rubber grommets, appropriate stainless nuts and bolts, and some stainless washers.

Thanks Stan - this is for the top-part of the rack. My bike is well equipped with eyelets on the dropouts. It's the seat-tube attachment points which need help.
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Old 05-09-14, 06:26 PM
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I have used P clamps for my rear rack for several years without issue. That is not where the majority of the stress is for a rack.
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Old 05-09-14, 06:27 PM
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Originally Posted by PolarBear007 View Post
Thanks Stan - this is for the top-part of the rack. My bike is well equipped with eyelets on the dropouts. It's the seat-tube attachment points which need help.
Ah, gotcha.

I've got a Tubus Luna rack that uses a monostay which attaches to the brake bridge using the rear caliper brake mounting bolt. I'm not sure which rack mounting system you have, but if it has two extensions that normally bolt to braze-ons on the seat stays, you may be able to fabricate a bracket to bolt to the extensions with a monostay from the center of the bracket. Just thinking out loud here...



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Old 05-09-14, 06:46 PM
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This is a Blackburn implementation of the monostay idea.

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Old 05-09-14, 07:38 PM
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Originally Posted by Scooper View Post
This is a Blackburn implementation of the monostay idea.

The monostay is a *very* cool idea!!!! Thanks!

I also may have come up with a solution.....

I could start by taking a piece of 3/4" diameter (or so...) steel tubing and sawing off a piece maybe 1/2" wide.

Then, saw it length-wise in half.

From there bend (on each end of the half-diameter piece) a place/tab to make a hole for a fastener.

If I ensure the initial tubing diameter is large enough to accommodate making the fastener "tabs" on each end plus enough to encircle the seat-down-tubes I could simply wrap them with rubber and bolt them on using one bolt (on the bottom side of the seat-down-tube) and then another bolt to secure at the other end of the tab whereby that bolt would also pass through the attachment/stabilizers bar on the rack.

Viola' problem solved!!!

THANKS GUYS!!!!
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Old 05-09-14, 09:15 PM
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my ancient blackburn rack has a rear brake hole attachment like that mentioned. it's made out of about 2mm thick stainless that can be bent with a hammer and a vice to conform to different frame geometries. although it looks to be insufficient, i can attest to thousands of miles of loaded touring with zero problems. i've seen some modern designs that are just about identical. there are some clever and subtle design elements that make it work well. most notably a small lengthwise lip on either side of the upper rack attachment point that prevents any lateral swiveling between rack and frame.
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