OBRA: OBRA Chat: Glued frame and trailer

Erik Voldengen

2007-03-11

Oh, btw, the frame broke on the left seat stay, right by the dropout. This
is why I suspect towing the trailer may have initiated the failure (small
crack) before I moved up to the torque-master two-seater trail-a-bike.

-Erik

_____

From: obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org] On
Behalf Of Erik Voldengen
Sent: Sunday, March 11, 2007 10:13 PM
To: 'OBRA'
Subject: Re: [OBRA Chat] Glued frame and trailer

I think that'd be a very good question to ask Calfee or Zinn.

I used to tow a trailer with a steel Fuji that had a similar clamp. My kids
then got bigger and I moved to a two-seater trail-a-bike.

The frame broke going down a big hill, kids in tow. I'm not sure using the
trailer had anything to do with it or not (weakened the frame), but I am
pretty certain towing things with your bike puts stress on the frame for
which it was not designed.

I guess I was lucky because I was using a steel frame. It broke, but stayed
in one piece. It was very hard to control, but the kids just assumed I was
weaving back and forth for fun ;) I'm not sure what would happen to a
carbon frame, but as you know, when carbon breaks, it really breaks.

Hope that helps.

-Erik

_____

From: obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org] On
Behalf Of Nikos Tzetos
Sent: Saturday, March 10, 2007 9:21 PM
To: obra@list.obra.org
Subject: [OBRA Chat] Glued frame and trailer

Hello:

I have an oldish Alan frame and am often using it to pull a Burley trailer
with one or two children. The trailer attachment mechanism is designed to
exert stress on three points on the left rear triangle, torquing the frame
around the dropout, a very simple and effective design. Does anyone have any
experience with fatigue of the glued components in that area and possible
damage to the frame?

Thank you,

Nikos

Nikos Tzetos

2007-03-11

Sorry, I neglected to say it is an aluminum ALAN.

Nikos
----- Original Message -----
From: Erik Voldengen
To: 'OBRA'
Sent: Sunday, March 11, 2007 10:13 PM
Subject: Re: [OBRA Chat] Glued frame and trailer

I think that'd be a very good question to ask Calfee or Zinn.

I used to tow a trailer with a steel Fuji that had a similar clamp. My kids then got bigger and I moved to a two-seater trail-a-bike.

The frame broke going down a big hill, kids in tow. I'm not sure using the trailer had anything to do with it or not (weakened the frame), but I am pretty certain towing things with your bike puts stress on the frame for which it was not designed.

I guess I was lucky because I was using a steel frame. It broke, but stayed in one piece. It was very hard to control, but the kids just assumed I was weaving back and forth for fun ;) I'm not sure what would happen to a carbon frame, but as you know, when carbon breaks, it really breaks.

Hope that helps.

-Erik

Erik Voldengen

2007-03-11

I think that'd be a very good question to ask Calfee or Zinn.

I used to tow a trailer with a steel Fuji that had a similar clamp. My kids
then got bigger and I moved to a two-seater trail-a-bike.

The frame broke going down a big hill, kids in tow. I'm not sure using the
trailer had anything to do with it or not (weakened the frame), but I am
pretty certain towing things with your bike puts stress on the frame for
which it was not designed.

I guess I was lucky because I was using a steel frame. It broke, but stayed
in one piece. It was very hard to control, but the kids just assumed I was
weaving back and forth for fun ;) I'm not sure what would happen to a
carbon frame, but as you know, when carbon breaks, it really breaks.

Hope that helps.

-Erik

_____

From: obra-bounces@list.obra.org [mailto:obra-bounces@list.obra.org] On
Behalf Of Nikos Tzetos
Sent: Saturday, March 10, 2007 9:21 PM
To: obra@list.obra.org
Subject: [OBRA Chat] Glued frame and trailer

Hello:

I have an oldish Alan frame and am often using it to pull a Burley trailer
with one or two children. The trailer attachment mechanism is designed to
exert stress on three points on the left rear triangle, torquing the frame
around the dropout, a very simple and effective design. Does anyone have any
experience with fatigue of the glued components in that area and possible
damage to the frame?

Thank you,

Nikos

Luciano bailey

2007-03-11

Defintly not the frame to tow a trailer with.

>From: "Mark J. Ginsberg"
>Reply-To: markjginsberg@yahoo.com
>To: Nikos Tzetos , obra@list.obra.org
>Subject: Re: [OBRA Chat] Glued frame and trailer
>Date: Sun, 11 Mar 2007 09:34:13 -0700 (PDT)
>
>If this design causes you concern, burley make an after marker clamp that
>removes the one which connects as you decribe and replaces the rear quick
>release, and attached to their q/r with a pin.
>
>Also moves the trailer further back, so your left heel doesn't his the
>mounting hardware on shorter chainstayed bicycles.
>
>Mark Ginsberg
>
>Nikos Tzetos wrote: Hello:
>
> I have an oldish Alan frame and am often using it to pull a Burley
>trailer with one or two children. The trailer attachment mechanism is
>designed to exert stress on three points on the left rear triangle,
>torquing the frame around the dropout, a very simple and effective design.
>Does anyone have any experience with fatigue of the glued components in
>that area and possible damage to the frame?
>
> Thank you,
>
> Nikos
>
>_______________________________________________
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>http://list.obra.org/mailman/listinfo/obra
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>
>
>
>Mark J. Ginsberg
>Attorney At Law
>621 SW Morrison St., Ste. 900
>Portland, OR 97204
>(503) 542-3000
>Fax (503) 227-2530
>markjginsberg@yahoo.com
>www.bikesafetylaw.com
>
>---------------------------------
>Finding fabulous fares is fun.
>Let Yahoo! FareChase search your favorite travel sites to find flight and
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David Auker

2007-03-11

I rather like the old, original(?) Burley clamp which grips both seat
and chain stays; I see this as helping to alleviate stress on the
dropout itself, going to the actual tubes. I think I'd rather trust the
tubes' integrity than the glued-in dropouts!

I have enhanced mine with extra rubber, so the grip seems firm (yet
gentle on the paint).

I haven't really examined the clamp system Mark mentions, but perhaps
one of its benefits is stress to both dropouts via the axle. I still
thing going to the tubes themselves better. (That left heel-strike
potential IS tedious, though!)

David

Mark J. Ginsberg wrote:
> If this design causes you concern, burley make an after marker clamp
> that removes the one which connects as you decribe and replaces the
> rear quick release, and attached to their q/r with a pin.
>
> Also moves the trailer further back, so your left heel doesn't his the
> mounting hardware on shorter chainstayed bicycles.
>
> Mark Ginsberg
>
> */Nikos Tzetos /* wrote:
>
> Hello:
>
> I have an oldish Alan frame and am often using it to pull a Burley
> trailer with one or two children. The trailer attachment mechanism
> is designed to exert stress on three points on the left rear
> triangle, torquing the frame around the dropout, a very simple and
> effective design. Does anyone have any experience with fatigue of
> the glued components in that area and possible damage to the frame?
>
> Thank you,
>
> Nikos
> _______________________________________________
> OBRA mailing list
> obra@list.obra.org
> http://list.obra.org/mailman/listinfo/obra
> Unsubscribe: obra-unsubscribe@list.obra.org
>
>
>
>
> Mark J. Ginsberg
> Attorney At Law
> 621 SW Morrison St., Ste. 900
> Portland, OR 97204
> (503) 542-3000
> Fax (503) 227-2530
> markjginsberg@yahoo.com
> www.bikesafetylaw.com
>
> ------------------------------------------------------------------------
> Finding fabulous fares is fun.
> Let Yahoo! FareChase search your favorite travel sites
>
> to find flight and hotel bargains.
> ------------------------------------------------------------------------
>
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>

Mark J. Ginsberg

2007-03-11

If this design causes you concern, burley make an after marker clamp that removes the one which connects as you decribe and replaces the rear quick release, and attached to their q/r with a pin.

Also moves the trailer further back, so your left heel doesn't his the mounting hardware on shorter chainstayed bicycles.

Mark Ginsberg

Nikos Tzetos wrote: Hello:

I have an oldish Alan frame and am often using it to pull a Burley trailer with one or two children. The trailer attachment mechanism is designed to exert stress on three points on the left rear triangle, torquing the frame around the dropout, a very simple and effective design. Does anyone have any experience with fatigue of the glued components in that area and possible damage to the frame?

Thank you,

Nikos

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OBRA mailing list
obra@list.obra.org
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Unsubscribe: obra-unsubscribe@list.obra.org

Mark J. Ginsberg
Attorney At Law
621 SW Morrison St., Ste. 900
Portland, OR 97204
(503) 542-3000
Fax (503) 227-2530
markjginsberg@yahoo.com
www.bikesafetylaw.com

---------------------------------
Finding fabulous fares is fun.
Let Yahoo! FareChase search your favorite travel sites to find flight and hotel bargains.

Nikos Tzetos

2007-03-10

Hello:

I have an oldish Alan frame and am often using it to pull a Burley trailer with one or two children. The trailer attachment mechanism is designed to exert stress on three points on the left rear triangle, torquing the frame around the dropout, a very simple and effective design. Does anyone have any experience with fatigue of the glued components in that area and possible damage to the frame?

Thank you,

Nikos